diff --git a/languages/jetbrains.mps.lang.typesystem2/jetbrains.mps.lang.typesystem2.mpl b/languages/jetbrains.mps.lang.typesystem2/jetbrains.mps.lang.typesystem2.mpl
index 6e4aa6d3..812d66c6 100644
--- a/languages/jetbrains.mps.lang.typesystem2/jetbrains.mps.lang.typesystem2.mpl
+++ b/languages/jetbrains.mps.lang.typesystem2/jetbrains.mps.lang.typesystem2.mpl
@@ -93,6 +93,7 @@
     <dependency reexport="false">c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)</dependency>
     <dependency reexport="false">26e8f4ce-2a35-4f44-8065-e5ba154b18e9(jetbrains.mps.lang.typesystem2.runtime)</dependency>
     <dependency reexport="false">6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)</dependency>
+    <dependency reexport="false">35320f26-77cb-4c55-be9f-a97a27770af1(jetbrains.mps.logic)</dependency>
   </dependencies>
   <usedLanguages>
     <usedLanguage>daafa647-f1f7-4b0b-b096-69cd7c8408c0(jetbrains.mps.baseLanguage.regexp)</usedLanguage>
@@ -142,6 +143,7 @@
     <extendedLanguage>7866978e-a0f0-4cc7-81bc-4d213d9375e1(jetbrains.mps.lang.smodel)</extendedLanguage>
     <extendedLanguage>f3061a53-9226-4cc5-a443-f952ceaf5816(jetbrains.mps.baseLanguage)</extendedLanguage>
     <extendedLanguage>83888646-71ce-4f1c-9c53-c54016f6ad4f(jetbrains.mps.baseLanguage.collections)</extendedLanguage>
+    <extendedLanguage>35320f26-77cb-4c55-be9f-a97a27770af1(jetbrains.mps.logic)</extendedLanguage>
   </extendedLanguages>
 </language>
 
diff --git a/languages/jetbrains.mps.lang.typesystem2/languageModels/structure.mps b/languages/jetbrains.mps.lang.typesystem2/languageModels/structure.mps
index 603f47e9..38a97068 100644
--- a/languages/jetbrains.mps.lang.typesystem2/languageModels/structure.mps
+++ b/languages/jetbrains.mps.lang.typesystem2/languageModels/structure.mps
@@ -9,11 +9,13 @@
   <imports>
     <import index="tp25" ref="r:00000000-0000-4000-0000-011c89590301(jetbrains.mps.lang.smodel.structure)" />
     <import index="tpee" ref="r:00000000-0000-4000-0000-011c895902ca(jetbrains.mps.baseLanguage.structure)" />
+    <import index="5j4j" ref="r:c8fb1c5e-8204-4904-a38f-678899d447c1(jetbrains.mps.logic.structure)" />
     <import index="tpce" ref="r:00000000-0000-4000-0000-011c89590292(jetbrains.mps.lang.structure.structure)" implicit="true" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
   </imports>
   <registry>
     <language id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure">
+      <concept id="1224240836180" name="jetbrains.mps.lang.structure.structure.DeprecatedNodeAnnotation" flags="ig" index="asaX9" />
       <concept id="1169125787135" name="jetbrains.mps.lang.structure.structure.AbstractConceptDeclaration" flags="ig" index="PkWjJ">
         <property id="4628067390765956807" name="final" index="R5$K2" />
         <property id="4628067390765956802" name="abstract" index="R5$K7" />
@@ -42,6 +44,7 @@
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
         <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+        <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
       </concept>
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
@@ -140,6 +143,9 @@
     <node concept="PrWs8" id="6p0DfM0c$n_" role="PzmwI">
       <ref role="PrY4T" to="tpck:h0TrEE$" resolve="INamedConcept" />
     </node>
+    <node concept="PrWs8" id="7E86$tK_nY6" role="PzmwI">
+      <ref role="PrY4T" to="5j4j:7E86$tK$Rgo" resolve="LogicalVariableScope" />
+    </node>
   </node>
   <node concept="1TIwiD" id="6p0DfM0a3d3">
     <property role="TrG5h" value="RulePart" />
@@ -241,6 +247,7 @@
     <property role="R5$K2" value="false" />
     <property role="3GE5qa" value="constraint.expression" />
     <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
+    <node concept="asaX9" id="7E86$tKsJ$E" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="6p0DfM0ew6_">
     <property role="TrG5h" value="LogicVariable" />
@@ -256,6 +263,7 @@
       <property role="20kJfa" value="index" />
       <ref role="20lvS9" node="6p0DfM0hKK1" resolve="LogicValue" />
     </node>
+    <node concept="asaX9" id="7E86$tKsJvY" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="6p0DfM0hKK1">
     <property role="TrG5h" value="LogicValue" />
@@ -267,6 +275,7 @@
       <property role="20lbJX" value="1" />
       <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
     </node>
+    <node concept="asaX9" id="7E86$tKsKis" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="6p0DfM0ia8T">
     <property role="3GE5qa" value="rule.input" />
@@ -355,6 +364,7 @@
     <node concept="PrWs8" id="2E5lcNn2Ya9" role="PzmwI">
       <ref role="PrY4T" to="tpck:h0TrEE$" resolve="INamedConcept" />
     </node>
+    <node concept="asaX9" id="7E86$tKtCFm" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="2E5lcNn5kn6">
     <property role="3GE5qa" value="constraint.variable" />
@@ -385,6 +395,7 @@
     <property role="TrG5h" value="LogicVariableType" />
     <property role="34LRSv" value="logic" />
     <ref role="1TJDcQ" to="tpee:fz3vP1H" resolve="Type" />
+    <node concept="asaX9" id="1mP5b6jORvk" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="6Ng87FPVZtW">
     <property role="3GE5qa" value="constraint.expression" />
@@ -396,6 +407,7 @@
       <property role="20lbJX" value="1" />
       <ref role="20lvS9" node="2E5lcNn2Y0P" resolve="LogicVariableDeclaration" />
     </node>
+    <node concept="asaX9" id="7E86$tKtPGJ" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="6Ng87FPWKL5">
     <property role="3GE5qa" value="constraint.expression" />
@@ -407,6 +419,7 @@
       <property role="20lbJX" value="1" />
       <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
     </node>
+    <node concept="asaX9" id="7E86$tKt5_j" role="lGtFl" />
   </node>
   <node concept="1TIwiD" id="4laj_h9P4cy">
     <property role="3GE5qa" value="rule" />
diff --git a/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/rule.mps b/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/rule.mps
index 0973e5d6..2e6a81f2 100644
--- a/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/rule.mps
+++ b/languages/jetbrains.mps.lang.typesystem2/runtime/models/jetbrains/mps/lang/typesystem2/runtime/rule.mps
@@ -3374,6 +3374,7 @@
   </node>
   <node concept="312cEu" id="5k_shARN7H1">
     <property role="TrG5h" value="LogicVariable" />
+    <property role="IEkAT" value="false" />
     <node concept="2tJIrI" id="5k_shARN7JU" role="jymVt" />
     <node concept="2YIFZL" id="5k_shARN93B" role="jymVt">
       <property role="TrG5h" value="withName" />
@@ -3632,6 +3633,9 @@
     <node concept="3uibUv" id="104EUzFJLOU" role="1zkMxy">
       <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
     </node>
+    <node concept="2AHcQZ" id="7E86$tKu0Pc" role="2AJF6D">
+      <ref role="2AI5Lk" to="e2lb:~Deprecated" resolve="Deprecated" />
+    </node>
   </node>
   <node concept="312cEu" id="7Oc59RS$wKP">
     <property role="TrG5h" value="InvalidRuleException" />
diff --git a/languages/jetbrains.mps.logic/generator/template/main@generator.mps b/languages/jetbrains.mps.logic/generator/template/main@generator.mps
index e552caf5..a51177f4 100644
--- a/languages/jetbrains.mps.logic/generator/template/main@generator.mps
+++ b/languages/jetbrains.mps.logic/generator/template/main@generator.mps
@@ -16,14 +16,31 @@
     <import index="tpee" ref="r:00000000-0000-4000-0000-011c895902ca(jetbrains.mps.baseLanguage.structure)" />
     <import index="ec5l" ref="f:java_stub#8865b7a8-5271-43d3-884c-6fd1d9cfdd34#org.jetbrains.mps.openapi.model(MPS.OpenAPI/org.jetbrains.mps.openapi.model@java_stub)" />
     <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.builtin.unification)" />
+    <import index="xq5w" ref="r:729bada4-05fa-458f-8bf8-28b9cb978726(jetbrains.mps.logic.builtin.variable)" />
+    <import index="yg8f" ref="r:e213377a-f1a7-4ba7-9d08-96bcb97ed8ce(jetbrains.mps.logic.builtin)" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
     <import index="e2lb" ref="f:java_stub#6354ebe7-c22a-4a0f-ac54-50b52ab9b065#java.lang(JDK/java.lang@java_stub)" implicit="true" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1215693861676" name="jetbrains.mps.baseLanguage.structure.BaseAssignmentExpression" flags="nn" index="d038R">
+        <child id="1068498886297" name="rValue" index="37vLTx" />
+        <child id="1068498886295" name="lValue" index="37vLTJ" />
+      </concept>
+      <concept id="1153422305557" name="jetbrains.mps.baseLanguage.structure.LessThanOrEqualsExpression" flags="nn" index="2dkUwp" />
       <concept id="4836112446988635817" name="jetbrains.mps.baseLanguage.structure.UndefinedType" flags="in" index="2jxLKc" />
       <concept id="1202948039474" name="jetbrains.mps.baseLanguage.structure.InstanceMethodCallOperation" flags="nn" index="liA8E" />
       <concept id="1465982738277781862" name="jetbrains.mps.baseLanguage.structure.PlaceholderMember" flags="ng" index="2tJIrI" />
+      <concept id="1239714755177" name="jetbrains.mps.baseLanguage.structure.AbstractUnaryNumberOperation" flags="nn" index="2$Kvd9">
+        <child id="1239714902950" name="expression" index="2$L3a6" />
+      </concept>
+      <concept id="1173175405605" name="jetbrains.mps.baseLanguage.structure.ArrayAccessExpression" flags="nn" index="AH0OO">
+        <child id="1173175577737" name="index" index="AHEQo" />
+        <child id="1173175590490" name="array" index="AHHXb" />
+      </concept>
+      <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
+        <child id="1154032183016" name="body" index="2LFqv$" />
+      </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
@@ -42,6 +59,10 @@
         <reference id="1144433194310" name="classConcept" index="1Pybhc" />
       </concept>
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
+      <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
+      <concept id="1070534760951" name="jetbrains.mps.baseLanguage.structure.ArrayType" flags="in" index="10Q1$e">
+        <child id="1070534760952" name="componentType" index="10Q1$1" />
+      </concept>
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu" />
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
         <child id="1068431790190" name="initializer" index="33vP2m" />
@@ -50,6 +71,7 @@
         <reference id="1068581517664" name="variableDeclaration" index="3cqZAo" />
       </concept>
       <concept id="1068498886292" name="jetbrains.mps.baseLanguage.structure.ParameterDeclaration" flags="ir" index="37vLTG" />
+      <concept id="1068498886294" name="jetbrains.mps.baseLanguage.structure.AssignmentExpression" flags="nn" index="37vLTI" />
       <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
         <child id="5680397130376446158" name="type" index="1tU5fm" />
       </concept>
@@ -64,10 +86,14 @@
       <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
         <child id="1068581517665" name="statement" index="3cqZAp" />
       </concept>
+      <concept id="1068580320020" name="jetbrains.mps.baseLanguage.structure.IntegerConstant" flags="nn" index="3cmrfG">
+        <property id="1068580320021" name="value" index="3cmrfH" />
+      </concept>
       <concept id="1068581242875" name="jetbrains.mps.baseLanguage.structure.PlusExpression" flags="nn" index="3cpWs3" />
       <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
       </concept>
+      <concept id="1068581242869" name="jetbrains.mps.baseLanguage.structure.MinusExpression" flags="nn" index="3cpWsd" />
       <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
       <concept id="1079359253375" name="jetbrains.mps.baseLanguage.structure.ParenthesizedExpression" flags="nn" index="1eOMI4">
         <child id="1079359253376" name="expression" index="1eOMHV" />
@@ -90,9 +116,24 @@
         <child id="1081773367579" name="rightExpression" index="3uHU7w" />
         <child id="1081773367580" name="leftExpression" index="3uHU7B" />
       </concept>
+      <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
+      <concept id="1184950988562" name="jetbrains.mps.baseLanguage.structure.ArrayCreator" flags="nn" index="3$_iS1">
+        <child id="1184951007469" name="componentType" index="3$_nBY" />
+        <child id="1184952969026" name="dimensionExpression" index="3$GQph" />
+      </concept>
+      <concept id="1184952934362" name="jetbrains.mps.baseLanguage.structure.DimensionExpression" flags="nn" index="3$GHV9">
+        <child id="1184953288404" name="expression" index="3$I4v7" />
+      </concept>
       <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
         <child id="1178549979242" name="visibility" index="1B3o_S" />
       </concept>
+      <concept id="1144230876926" name="jetbrains.mps.baseLanguage.structure.AbstractForStatement" flags="nn" index="1DupvO">
+        <child id="1144230900587" name="variable" index="1Duv9x" />
+      </concept>
+      <concept id="1144231330558" name="jetbrains.mps.baseLanguage.structure.ForStatement" flags="nn" index="1Dw8fO">
+        <child id="1144231399730" name="condition" index="1Dwp0S" />
+        <child id="1144231408325" name="iteration" index="1Dwrff" />
+      </concept>
       <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
         <property id="6329021646629104958" name="text" index="3SKdUp" />
       </concept>
@@ -100,6 +141,7 @@
         <child id="6329021646629175155" name="commentPart" index="3SKWNk" />
       </concept>
       <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
+      <concept id="1080120340718" name="jetbrains.mps.baseLanguage.structure.AndExpression" flags="nn" index="1Wc70l" />
     </language>
     <language id="d4615e3b-d671-4ba9-af01-2b78369b0ba7" name="jetbrains.mps.lang.pattern">
       <concept id="1136720037777" name="jetbrains.mps.lang.pattern.structure.PatternExpression" flags="in" index="2DMOqp">
@@ -122,6 +164,13 @@
         <child id="1177093586806" name="templateNode" index="gfFT$" />
       </concept>
       <concept id="1168559333462" name="jetbrains.mps.lang.generator.structure.TemplateDeclarationReference" flags="ln" index="j$656" />
+      <concept id="1168559512253" name="jetbrains.mps.lang.generator.structure.DismissTopMappingRule" flags="lg" index="j$LIH">
+        <child id="1169669152123" name="generatorMessage" index="1lHHLF" />
+      </concept>
+      <concept id="1112730859144" name="jetbrains.mps.lang.generator.structure.TemplateSwitch" flags="ig" index="jVnub">
+        <child id="1168558750579" name="defaultConsequence" index="jxRDz" />
+        <child id="1167340453568" name="reductionMappingRule" index="3aUrZf" />
+      </concept>
       <concept id="1168619357332" name="jetbrains.mps.lang.generator.structure.RootTemplateAnnotation" flags="lg" index="n94m4">
         <reference id="1168619429071" name="applicableConcept" index="n9lRv" />
       </concept>
@@ -136,9 +185,11 @@
       <concept id="1194565793557" name="jetbrains.mps.lang.generator.structure.IncludeMacro" flags="ln" index="xERo3">
         <reference id="1194566366375" name="includeTemplate" index="xH3mL" />
       </concept>
+      <concept id="5133195082121471908" name="jetbrains.mps.lang.generator.structure.LabelMacro" flags="ln" index="2ZBi8u" />
       <concept id="1167168920554" name="jetbrains.mps.lang.generator.structure.BaseMappingRule_Condition" flags="in" index="30G5F_" />
       <concept id="1167169188348" name="jetbrains.mps.lang.generator.structure.TemplateFunctionParameter_sourceNode" flags="nn" index="30H73N" />
       <concept id="1167169308231" name="jetbrains.mps.lang.generator.structure.BaseMappingRule" flags="ng" index="30H$t8">
+        <property id="1167272244852" name="applyToConceptInheritors" index="36QftV" />
         <reference id="1200917515464" name="labelDeclaration" index="2sgKRv" />
         <reference id="1167169349424" name="applicableConcept" index="30HIoZ" />
         <child id="1167169362365" name="conditionFunction" index="30HLyM" />
@@ -168,6 +219,11 @@
         <property id="1177959072138" name="keepSourceRoot" index="13Pg2o" />
         <reference id="1167514355421" name="template" index="3lhOvi" />
       </concept>
+      <concept id="1169670156577" name="jetbrains.mps.lang.generator.structure.GeneratorMessage" flags="lg" index="1lLz0L">
+        <property id="1169670173015" name="messageText" index="1lLB17" />
+        <property id="1169670356567" name="messageType" index="1lMjX7" />
+      </concept>
+      <concept id="982871510068000147" name="jetbrains.mps.lang.generator.structure.TemplateSwitchMacro" flags="lg" index="1sPUBX" />
       <concept id="1167756080639" name="jetbrains.mps.lang.generator.structure.PropertyMacro_GetPropertyValue" flags="in" index="3zFVjK" />
       <concept id="1167756221419" name="jetbrains.mps.lang.generator.structure.TemplateFunctionParameter_templatePropertyValue" flags="nn" index="3zGtF$" />
       <concept id="1167770111131" name="jetbrains.mps.lang.generator.structure.ReferenceMacro_GetReferent" flags="in" index="3$xsQk" />
@@ -190,6 +246,10 @@
       </concept>
     </language>
     <language id="d7706f63-9be2-479c-a3da-ae92af1e64d5" name="jetbrains.mps.lang.generator.generationContext">
+      <concept id="1218047638031" name="jetbrains.mps.lang.generator.generationContext.structure.GenerationContextOp_CreateUniqueName" flags="nn" index="2piZGk">
+        <child id="1218047638032" name="baseName" index="2piZGb" />
+        <child id="1218049772449" name="contextNode" index="2pr8EU" />
+      </concept>
       <concept id="1216860049627" name="jetbrains.mps.lang.generator.generationContext.structure.GenerationContextOp_GetOutputByLabelAndInput" flags="nn" index="1iwH70">
         <reference id="1216860049628" name="label" index="1iwH77" />
         <child id="1216860049632" name="inputNode" index="1iwH7V" />
@@ -207,13 +267,15 @@
       </concept>
     </language>
     <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.ListNode" flags="ng" index="KCUsM" />
       <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.Ast" flags="ng" index="1oi1Uc">
         <child id="7571593955706125526" name="root" index="1oi0x0" />
       </concept>
+      <concept id="7571593955706137263" name="jetbrains.mps.logic.structure.ChildRole" flags="ng" index="1oi5ST" />
       <concept id="7571593955706137125" name="jetbrains.mps.logic.structure.Node" flags="ng" index="1oi5UN" />
-      <concept id="7571593955706284481" name="jetbrains.mps.logic.structure.Symbol" flags="ng" index="1ojpPn" />
-      <concept id="1503029989441024" name="jetbrains.mps.logic.structure.AbstractNode" flags="ng" index="1KByzZ">
-        <child id="1503029989483908" name="symbol" index="1KAndV" />
+      <concept id="7571593955706137472" name="jetbrains.mps.logic.structure.ValueRole" flags="ng" index="1oi5Wm" />
+      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.ValueHolder" flags="ng" index="1oi5XN">
+        <property id="7571593955706137638" name="value" index="1oi5yK" />
       </concept>
     </language>
     <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
@@ -234,6 +296,9 @@
       </concept>
       <concept id="1171305280644" name="jetbrains.mps.lang.smodel.structure.Node_GetDescendantsOperation" flags="nn" index="2Rf3mk" />
       <concept id="1171407110247" name="jetbrains.mps.lang.smodel.structure.Node_GetAncestorOperation" flags="nn" index="2Xjw5R" />
+      <concept id="1154546920561" name="jetbrains.mps.lang.smodel.structure.OperationParm_ConceptList" flags="ng" index="3gmYPX">
+        <child id="1154546920563" name="concept" index="3gmYPZ" />
+      </concept>
       <concept id="1154546950173" name="jetbrains.mps.lang.smodel.structure.ConceptReference" flags="ng" index="3gn64h">
         <reference id="1154546997487" name="concept" index="3gnhBz" />
       </concept>
@@ -244,10 +309,17 @@
       <concept id="1146171026731" name="jetbrains.mps.lang.smodel.structure.Property_HasValue_Enum" flags="nn" index="3t7uKx">
         <child id="1146171026732" name="value" index="3t7uKA" />
       </concept>
+      <concept id="1171999116870" name="jetbrains.mps.lang.smodel.structure.Node_IsNullOperation" flags="nn" index="3w_OXm" />
       <concept id="1172008320231" name="jetbrains.mps.lang.smodel.structure.Node_IsNotNullOperation" flags="nn" index="3x8VRR" />
       <concept id="1144101972840" name="jetbrains.mps.lang.smodel.structure.OperationParm_Concept" flags="ng" index="1xMEDy">
         <child id="1207343664468" name="conceptArgument" index="ri$Ld" />
       </concept>
+      <concept id="6407023681583036853" name="jetbrains.mps.lang.smodel.structure.NodeAttributeQualifier" flags="ng" index="3CFYIy">
+        <reference id="6407023681583036854" name="attributeConcept" index="3CFYIx" />
+      </concept>
+      <concept id="6407023681583031218" name="jetbrains.mps.lang.smodel.structure.AttributeAccess" flags="nn" index="3CFZ6_">
+        <child id="6407023681583036852" name="qualifier" index="3CFYIz" />
+      </concept>
       <concept id="1140137987495" name="jetbrains.mps.lang.smodel.structure.SNodeTypeCastExpression" flags="nn" index="1PxgMI">
         <property id="1238684351431" name="asCast" index="1BlNFB" />
         <reference id="1140138128738" name="concept" index="1PxNhF" />
@@ -265,6 +337,7 @@
     </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
         <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
       </concept>
       <concept id="3364660638048049750" name="jetbrains.mps.lang.core.structure.PropertyAttribute" flags="ng" index="A9Btg">
@@ -278,6 +351,7 @@
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
+      <concept id="4222318806802425298" name="jetbrains.mps.lang.core.structure.SuppressErrorsAnnotation" flags="ng" index="15s5l7" />
     </language>
     <language id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections">
       <concept id="1204796164442" name="jetbrains.mps.baseLanguage.collections.structure.InternalSequenceOperation" flags="nn" index="23sCx2">
@@ -408,6 +482,51 @@
         </node>
       </node>
     </node>
+    <node concept="3aamgX" id="dfChU1CJoS" role="3acgRq">
+      <ref role="30HIoZ" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+      <node concept="1Koe21" id="dfChU1CJoT" role="1lVwrX">
+        <node concept="3clFbS" id="dfChU1CJoU" role="1Koe22">
+          <node concept="3cpWs8" id="dfChU1CJoV" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1CJoW" role="3cpWs9">
+              <property role="TrG5h" value="tl" />
+              <node concept="3uibUv" id="dfChU1CJoX" role="1tU5fm">
+                <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="dfChU1CJoY" role="3cqZAp">
+            <node concept="2OqwBi" id="dfChU1CJoZ" role="3clFbG">
+              <node concept="2OqwBi" id="dfChU1CJp0" role="2Oq$k0">
+                <node concept="37vLTw" id="dfChU1CJp1" role="2Oq$k0">
+                  <ref role="3cqZAo" node="dfChU1CJoW" resolve="tl" />
+                  <node concept="29HgVG" id="dfChU1CJp2" role="lGtFl">
+                    <node concept="3NFfHV" id="dfChU1CJp3" role="3NFExx">
+                      <node concept="3clFbS" id="dfChU1CJp4" role="2VODD2">
+                        <node concept="3clFbF" id="dfChU1CJp5" role="3cqZAp">
+                          <node concept="2OqwBi" id="dfChU1CJp6" role="3clFbG">
+                            <node concept="30H73N" id="dfChU1CJp7" role="2Oq$k0" />
+                            <node concept="3TrEf2" id="dfChU1CJp8" role="2OqNvi">
+                              <ref role="3Tt5mk" to="5j4j:dfChU1zo4I" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="liA8E" id="dfChU1CJp9" role="2OqNvi">
+                  <ref role="37wK5l" to="yg8f:dfChU1jXeL" resolve="asTreePart" />
+                </node>
+              </node>
+              <node concept="liA8E" id="dfChU1CJpa" role="2OqNvi">
+                <ref role="37wK5l" to="ie8e:2QE4RCGndD7" resolve="asRoot" />
+              </node>
+              <node concept="raruj" id="dfChU1CJpb" role="lGtFl" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="3aamgX" id="1pt0VTMHtwj" role="3acgRq">
       <ref role="30HIoZ" to="5j4j:1pt0VTMEFI$" resolve="Variable" />
       <node concept="14YyZ8" id="1pt0VTMHtwk" role="1lVwrX">
@@ -575,93 +694,17 @@
             </node>
           </node>
           <node concept="liA8E" id="2q_78a9qdZJ" role="2OqNvi">
-            <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="toTreePart" />
+            <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="asTreePart" />
           </node>
         </node>
       </node>
     </node>
-    <node concept="3aamgX" id="1pt0VTMwoZj" role="3acgRq">
+    <node concept="3aamgX" id="1OShD0H_kUK" role="3acgRq">
       <ref role="30HIoZ" to="5j4j:6$jH9oLmYC_" resolve="Node" />
-      <node concept="gft3U" id="1pt0VTMwp4o" role="1lVwrX">
-        <node concept="2YIFZM" id="104EUzFxgd8" role="gfFT$">
-          <ref role="37wK5l" to="ie8e:5JQSuNsxgzn" resolve="child" />
-          <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-          <node concept="Xl_RD" id="104EUzFxizp" role="37wK5m">
-            <property role="Xl_RC" value="node" />
-          </node>
-          <node concept="10Nm6u" id="104EUzFxgd9" role="37wK5m">
-            <node concept="2b32R4" id="104EUzFxgda" role="lGtFl">
-              <node concept="3JmXsc" id="104EUzFxgdb" role="2P8S$">
-                <node concept="3clFbS" id="104EUzFxgdc" role="2VODD2">
-                  <node concept="3clFbF" id="104EUzFxgdd" role="3cqZAp">
-                    <node concept="2OqwBi" id="104EUzFxgde" role="3clFbG">
-                      <node concept="2OqwBi" id="104EUzFxgdf" role="2Oq$k0">
-                        <node concept="2OqwBi" id="104EUzFxgdg" role="2Oq$k0">
-                          <node concept="3Tsc0h" id="104EUzFxgdh" role="2OqNvi">
-                            <ref role="3TtcxE" to="5j4j:6$jH9oLnyAp" />
-                          </node>
-                          <node concept="30H73N" id="104EUzFxgdi" role="2Oq$k0" />
-                        </node>
-                        <node concept="3zZkjj" id="104EUzFxgdj" role="2OqNvi">
-                          <node concept="1bVj0M" id="104EUzFxgdk" role="23t8la">
-                            <node concept="3clFbS" id="104EUzFxgdl" role="1bW5cS">
-                              <node concept="3clFbF" id="104EUzFxgdm" role="3cqZAp">
-                                <node concept="2OqwBi" id="104EUzFxgdn" role="3clFbG">
-                                  <node concept="37vLTw" id="104EUzFxgdo" role="2Oq$k0">
-                                    <ref role="3cqZAo" node="104EUzFxgdr" resolve="it" />
-                                  </node>
-                                  <node concept="1mIQ4w" id="104EUzFxgdp" role="2OqNvi">
-                                    <node concept="chp4Y" id="104EUzFxgdq" role="cj9EA">
-                                      <ref role="cht4Q" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
-                                    </node>
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                            <node concept="Rh6nW" id="104EUzFxgdr" role="1bW2Oz">
-                              <property role="TrG5h" value="it" />
-                              <node concept="2jxLKc" id="104EUzFxgds" role="1tU5fm" />
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                      <node concept="3QWeyG" id="104EUzFxgdt" role="2OqNvi">
-                        <node concept="2OqwBi" id="104EUzFxgdu" role="576Qk">
-                          <node concept="2OqwBi" id="104EUzFxgdv" role="2Oq$k0">
-                            <node concept="30H73N" id="104EUzFxgdw" role="2Oq$k0" />
-                            <node concept="3Tsc0h" id="104EUzFxgdx" role="2OqNvi">
-                              <ref role="3TtcxE" to="5j4j:6$jH9oLnyAp" />
-                            </node>
-                          </node>
-                          <node concept="3zZkjj" id="104EUzFxgdy" role="2OqNvi">
-                            <node concept="1bVj0M" id="104EUzFxgdz" role="23t8la">
-                              <node concept="3clFbS" id="104EUzFxgd$" role="1bW5cS">
-                                <node concept="3clFbF" id="104EUzFxgd_" role="3cqZAp">
-                                  <node concept="2OqwBi" id="104EUzFxgdA" role="3clFbG">
-                                    <node concept="37vLTw" id="104EUzFxgdB" role="2Oq$k0">
-                                      <ref role="3cqZAo" node="104EUzFxgdE" resolve="it" />
-                                    </node>
-                                    <node concept="1mIQ4w" id="104EUzFxgdC" role="2OqNvi">
-                                      <node concept="chp4Y" id="104EUzFxgdD" role="cj9EA">
-                                        <ref role="cht4Q" to="5j4j:6$jH9oLmYEJ" resolve="ChildRole" />
-                                      </node>
-                                    </node>
-                                  </node>
-                                </node>
-                              </node>
-                              <node concept="Rh6nW" id="104EUzFxgdE" role="1bW2Oz">
-                                <property role="TrG5h" value="it" />
-                                <node concept="2jxLKc" id="104EUzFxgdF" role="1tU5fm" />
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
+      <node concept="gft3U" id="1OShD0H_nFb" role="1lVwrX">
+        <node concept="1oi5UN" id="1OShD0H_nFh" role="gfFT$">
+          <node concept="1sPUBX" id="1OShD0H_nFl" role="lGtFl">
+            <ref role="v9R2y" node="1OShD0H_ejR" resolve="Node" />
           </node>
         </node>
       </node>
@@ -678,8 +721,8 @@
                     <node concept="1Yb3XT" id="cnjBgYCc4x" role="1Ub_4A">
                       <property role="TrG5h" value="tl" />
                       <node concept="2DMOqp" id="cnjBgYCc4z" role="1YbcFS">
-                        <node concept="3uibUv" id="cnjBgYCSNf" role="2DMOqq">
-                          <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="TreeLogical" />
+                        <node concept="3uibUv" id="dfChU1rRGU" role="2DMOqq">
+                          <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
                         </node>
                       </node>
                     </node>
@@ -703,8 +746,8 @@
               <node concept="3cpWs8" id="77AxcO5dVLX" role="3cqZAp">
                 <node concept="3cpWsn" id="77AxcO5dVLY" role="3cpWs9">
                   <property role="TrG5h" value="tl" />
-                  <node concept="3uibUv" id="77AxcO5dVLZ" role="1tU5fm">
-                    <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="TreeLogical" />
+                  <node concept="3uibUv" id="dfChU1rU8K" role="1tU5fm">
+                    <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
                   </node>
                   <node concept="10Nm6u" id="77AxcO5dVOi" role="33vP2m" />
                 </node>
@@ -730,7 +773,7 @@
                       </node>
                     </node>
                     <node concept="liA8E" id="77AxcO5dWLZ" role="2OqNvi">
-                      <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="toTreePart" />
+                      <ref role="37wK5l" to="yg8f:dfChU1jXeL" resolve="asTreePart" />
                     </node>
                   </node>
                   <node concept="liA8E" id="2QE4RCGorDr" role="2OqNvi">
@@ -762,431 +805,80 @@
         </node>
       </node>
     </node>
-    <node concept="3aamgX" id="5lJXKDhZJ" role="3acgRq">
+    <node concept="3aamgX" id="dfChU1yVWX" role="3acgRq">
+      <ref role="30HIoZ" to="5j4j:dfChU1ySVl" resolve="ExpressionRole" />
+      <node concept="1Koe21" id="dfChU1yZNR" role="1lVwrX">
+        <node concept="3clFbS" id="dfChU1yZNX" role="1Koe22">
+          <node concept="3cpWs8" id="dfChU1yZOe" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1yZOf" role="3cpWs9">
+              <property role="TrG5h" value="tl" />
+              <node concept="3uibUv" id="dfChU1yZOc" role="1tU5fm">
+                <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="dfChU1yZOW" role="3cqZAp">
+            <node concept="2OqwBi" id="dfChU1z17V" role="3clFbG">
+              <node concept="2OqwBi" id="dfChU1yZTL" role="2Oq$k0">
+                <node concept="37vLTw" id="dfChU1yZOU" role="2Oq$k0">
+                  <ref role="3cqZAo" node="dfChU1yZOf" resolve="tl" />
+                  <node concept="29HgVG" id="dfChU1z1LY" role="lGtFl">
+                    <node concept="3NFfHV" id="dfChU1z1LZ" role="3NFExx">
+                      <node concept="3clFbS" id="dfChU1z1M0" role="2VODD2">
+                        <node concept="3clFbF" id="dfChU1z1M6" role="3cqZAp">
+                          <node concept="2OqwBi" id="dfChU1z1M1" role="3clFbG">
+                            <node concept="3TrEf2" id="dfChU1z1M4" role="2OqNvi">
+                              <ref role="3Tt5mk" to="5j4j:dfChU1yT6L" />
+                            </node>
+                            <node concept="30H73N" id="dfChU1z1M5" role="2Oq$k0" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="liA8E" id="dfChU1z15k" role="2OqNvi">
+                  <ref role="37wK5l" to="yg8f:dfChU1jXeL" resolve="asTreePart" />
+                </node>
+              </node>
+              <node concept="liA8E" id="dfChU1z1Cy" role="2OqNvi">
+                <ref role="37wK5l" to="ie8e:2QE4RCGndD7" resolve="asRoot" />
+              </node>
+              <node concept="raruj" id="dfChU1z1Gt" role="lGtFl" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3aamgX" id="1OShD0H_454" role="3acgRq">
       <ref role="30HIoZ" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
-      <node concept="14YyZ8" id="5lJXKDhZK" role="1lVwrX">
-        <node concept="14ZrTv" id="5lJXKDhZL" role="14ZwWg">
-          <node concept="30G5F_" id="5lJXKDhZM" role="150hEN">
-            <node concept="3clFbS" id="5lJXKDhZN" role="2VODD2">
-              <node concept="3clFbF" id="5lJXKDlt1" role="3cqZAp">
-                <node concept="3fqX7Q" id="5lJXKDrkb" role="3clFbG">
-                  <node concept="2OqwBi" id="5lJXKDrkc" role="3fr31v">
-                    <node concept="2OqwBi" id="5lJXKDrkd" role="2Oq$k0">
-                      <node concept="2OqwBi" id="5lJXKDrke" role="2Oq$k0">
-                        <node concept="30H73N" id="5lJXKDrkf" role="2Oq$k0" />
-                        <node concept="3Tsc0h" id="5lJXKDrkg" role="2OqNvi">
-                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
-                        </node>
-                      </node>
-                      <node concept="1uHKPH" id="5lJXKDrkh" role="2OqNvi" />
-                    </node>
-                    <node concept="1mIQ4w" id="5lJXKDrki" role="2OqNvi">
-                      <node concept="chp4Y" id="5iubxWjkHGI" role="cj9EA">
-                        <ref role="cht4Q" to="5j4j:6SkxsM$4k7r" resolve="AbstractVariable" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="gft3U" id="5lJXKDhZV" role="150oIE">
-            <node concept="2YIFZM" id="5lJXKDhZW" role="gfFT$">
-              <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-              <ref role="37wK5l" to="ie8e:5JQSuNsx4I5" resolve="value" />
-              <node concept="Xl_RD" id="5lJXKDhZX" role="37wK5m">
-                <property role="Xl_RC" value="name" />
-                <node concept="17Uvod" id="5lJXKDhZY" role="lGtFl">
-                  <property role="2qtEX9" value="value" />
-                  <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-                  <node concept="3zFVjK" id="5lJXKDhZZ" role="3zH0cK">
-                    <node concept="3clFbS" id="5lJXKDi00" role="2VODD2">
-                      <node concept="3clFbF" id="5lJXKDi01" role="3cqZAp">
-                        <node concept="2OqwBi" id="5lJXKDi02" role="3clFbG">
-                          <node concept="30H73N" id="5lJXKDi03" role="2Oq$k0" />
-                          <node concept="3TrcHB" id="5lJXKDi04" role="2OqNvi">
-                            <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
-                          </node>
-                        </node>
-                      </node>
-                    </node>
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-                </node>
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-              <node concept="10Nm6u" id="5lJXKDi05" role="37wK5m">
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-                    <node concept="3clFbS" id="5lJXKDi08" role="2VODD2">
-                      <node concept="3clFbF" id="5lJXKDi09" role="3cqZAp">
-                        <node concept="2OqwBi" id="5lJXKDi0a" role="3clFbG">
-                          <node concept="3Tsc0h" id="5lJXKDi0b" role="2OqNvi">
-                            <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
-                          </node>
-                          <node concept="30H73N" id="5lJXKDi0c" role="2Oq$k0" />
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-            <ref role="37wK5l" to="ie8e:uNmovXjpCg" resolve="variable" />
-            <node concept="Xl_RD" id="5lJXKDwvN" role="37wK5m">
-              <property role="Xl_RC" value="name" />
-              <node concept="17Uvod" id="5lJXKDwvO" role="lGtFl">
-                <property role="2qtEX9" value="value" />
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-                        <node concept="30H73N" id="5lJXKDwvT" role="2Oq$k0" />
-                        <node concept="3TrcHB" id="5lJXKDwvU" role="2OqNvi">
-                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
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-            <node concept="10Nm6u" id="5lJXKDwvV" role="37wK5m">
-              <node concept="2b32R4" id="5lJXKDwvW" role="lGtFl">
-                <node concept="3JmXsc" id="5lJXKDwvX" role="2P8S$">
-                  <node concept="3clFbS" id="5lJXKDwvY" role="2VODD2">
-                    <node concept="3clFbF" id="5lJXKDwvZ" role="3cqZAp">
-                      <node concept="2OqwBi" id="5lJXKDww0" role="3clFbG">
-                        <node concept="3Tsc0h" id="5lJXKDxAb" role="2OqNvi">
-                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
-                        </node>
-                        <node concept="30H73N" id="5lJXKDww2" role="2Oq$k0" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
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-      <node concept="30G5F_" id="5lJXKDjZM" role="30HLyM">
-        <node concept="3clFbS" id="5lJXKDjZN" role="2VODD2">
-          <node concept="3SKdUt" id="5iubxWjmwcK" role="3cqZAp">
-            <node concept="3SKdUq" id="5iubxWjmwio" role="3SKWNk">
-              <property role="3SKdUp" value="TODO merge with other role" />
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-          </node>
-          <node concept="3clFbF" id="5lJXKDkLm" role="3cqZAp">
-            <node concept="2OqwBi" id="5lJXKDkLn" role="3clFbG">
-              <node concept="2OqwBi" id="5lJXKDkLo" role="2Oq$k0">
-                <node concept="30H73N" id="5lJXKDkLp" role="2Oq$k0" />
-                <node concept="3TrcHB" id="5lJXKDkLq" role="2OqNvi">
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-              </node>
-              <node concept="3t7uKx" id="5lJXKDkLr" role="2OqNvi">
-                <node concept="uoxfO" id="5lJXKDkLs" role="3t7uKA">
-                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYG1" />
-                </node>
-              </node>
-            </node>
+      <node concept="gft3U" id="1OShD0H_7yP" role="1lVwrX">
+        <node concept="1oi5Wm" id="1OShD0H_7LN" role="gfFT$">
+          <property role="TrG5h" value="value" />
+          <node concept="1sPUBX" id="1OShD0H_7LR" role="lGtFl">
+            <ref role="v9R2y" node="1OShD0H$K$J" resolve="ValueRole" />
           </node>
         </node>
       </node>
     </node>
-    <node concept="3aamgX" id="5lJXKDrSp" role="3acgRq">
-      <ref role="30HIoZ" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
-      <node concept="30G5F_" id="5lJXKDrTc" role="30HLyM">
-        <node concept="3clFbS" id="5lJXKDrTd" role="2VODD2">
-          <node concept="3SKdUt" id="5iubxWjmwE0" role="3cqZAp">
-            <node concept="3SKdUq" id="5iubxWjmwR8" role="3SKWNk">
-              <property role="3SKdUp" value="TODO merge with other role" />
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-          <node concept="3SKdUt" id="104EUzFvjrE" role="3cqZAp">
-            <node concept="3SKdUq" id="104EUzFvjB3" role="3SKWNk">
-              <property role="3SKdUp" value="TODO this condition is never satisfied in practice, remove this use case?" />
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-          </node>
-          <node concept="3clFbF" id="5lJXKDrTe" role="3cqZAp">
-            <node concept="2OqwBi" id="5lJXKDrTf" role="3clFbG">
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-                <node concept="30H73N" id="5lJXKDrTh" role="2Oq$k0" />
-                <node concept="3TrcHB" id="5lJXKDrTi" role="2OqNvi">
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-              </node>
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-                <node concept="uoxfO" id="5lJXKDrTk" role="3t7uKA">
-                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYGZ" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="gft3U" id="5lJXKDrSU" role="1lVwrX">
-        <node concept="2YIFZM" id="5s497Vql4sj" role="gfFT$">
-          <ref role="37wK5l" to="ie8e:5s497Vql4ru" resolve="valueList" />
-          <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-          <node concept="Xl_RD" id="5lJXKDrSW" role="37wK5m">
-            <property role="Xl_RC" value="name" />
-            <node concept="17Uvod" id="5lJXKDrSX" role="lGtFl">
-              <property role="2qtEX9" value="value" />
-              <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-              <node concept="3zFVjK" id="5lJXKDrSY" role="3zH0cK">
-                <node concept="3clFbS" id="5lJXKDrSZ" role="2VODD2">
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-                    <node concept="2OqwBi" id="5lJXKDrT1" role="3clFbG">
-                      <node concept="30H73N" id="5lJXKDrT2" role="2Oq$k0" />
-                      <node concept="3TrcHB" id="5lJXKDrT3" role="2OqNvi">
-                        <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
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-                    </node>
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-          <node concept="10Nm6u" id="5lJXKDrT4" role="37wK5m">
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-                <node concept="3clFbS" id="5lJXKDrT7" role="2VODD2">
-                  <node concept="3clFbF" id="5lJXKDrT8" role="3cqZAp">
-                    <node concept="2OqwBi" id="5lJXKDrT9" role="3clFbG">
-                      <node concept="3Tsc0h" id="5lJXKDrTa" role="2OqNvi">
-                        <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
-                      </node>
-                      <node concept="30H73N" id="5lJXKDrTb" role="2Oq$k0" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="3aamgX" id="1pt0VTMxNkN" role="3acgRq">
+    <node concept="3aamgX" id="1OShD0H$Ege" role="3acgRq">
       <ref role="30HIoZ" to="5j4j:6$jH9oLmYEJ" resolve="ChildRole" />
-      <node concept="14YyZ8" id="1pt0VTMxOj5" role="1lVwrX">
-        <node concept="14ZrTv" id="1pt0VTMxOjb" role="14ZwWg">
-          <node concept="30G5F_" id="1pt0VTMxOjc" role="150hEN">
-            <node concept="3clFbS" id="1pt0VTMxOjd" role="2VODD2">
-              <node concept="3clFbF" id="1pt0VTMG$Z0" role="3cqZAp">
-                <node concept="3fqX7Q" id="1pt0VTMGGzO" role="3clFbG">
-                  <node concept="2OqwBi" id="1pt0VTMGGzP" role="3fr31v">
-                    <node concept="2OqwBi" id="1pt0VTMGGzQ" role="2Oq$k0">
-                      <node concept="2OqwBi" id="1pt0VTMGGzR" role="2Oq$k0">
-                        <node concept="30H73N" id="1pt0VTMGGzS" role="2Oq$k0" />
-                        <node concept="3Tsc0h" id="1pt0VTMGGzT" role="2OqNvi">
-                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
-                        </node>
-                      </node>
-                      <node concept="1uHKPH" id="1pt0VTMGGzU" role="2OqNvi" />
-                    </node>
-                    <node concept="1mIQ4w" id="1pt0VTMGGzV" role="2OqNvi">
-                      <node concept="chp4Y" id="6SkxsM$4lxx" role="cj9EA">
-                        <ref role="cht4Q" to="5j4j:6SkxsM$4k7r" resolve="AbstractVariable" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="gft3U" id="1pt0VTMxOJW" role="150oIE">
-            <node concept="2YIFZM" id="1pt0VTMxOJX" role="gfFT$">
-              <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-              <ref role="37wK5l" to="ie8e:5JQSuNsxgzn" resolve="child" />
-              <node concept="Xl_RD" id="1pt0VTMxOJY" role="37wK5m">
-                <property role="Xl_RC" value="name" />
-                <node concept="17Uvod" id="1pt0VTMxOJZ" role="lGtFl">
-                  <property role="2qtEX9" value="value" />
-                  <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-                  <node concept="3zFVjK" id="1pt0VTMxOK0" role="3zH0cK">
-                    <node concept="3clFbS" id="1pt0VTMxOK1" role="2VODD2">
-                      <node concept="3clFbF" id="1pt0VTMxOK2" role="3cqZAp">
-                        <node concept="2OqwBi" id="1pt0VTMxOK3" role="3clFbG">
-                          <node concept="30H73N" id="1pt0VTMxOK4" role="2Oq$k0" />
-                          <node concept="3TrcHB" id="1pt0VTMxOK5" role="2OqNvi">
-                            <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
-                          </node>
-                        </node>
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-              <node concept="10Nm6u" id="1pt0VTMxOK6" role="37wK5m">
-                <node concept="2b32R4" id="1pt0VTMxOK7" role="lGtFl">
-                  <node concept="3JmXsc" id="1pt0VTMxOK8" role="2P8S$">
-                    <node concept="3clFbS" id="1pt0VTMxOK9" role="2VODD2">
-                      <node concept="3clFbF" id="1pt0VTMxOKa" role="3cqZAp">
-                        <node concept="2OqwBi" id="1pt0VTMxOKb" role="3clFbG">
-                          <node concept="3Tsc0h" id="1pt0VTMxOKc" role="2OqNvi">
-                            <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
-                          </node>
-                          <node concept="30H73N" id="1pt0VTMxOKd" role="2Oq$k0" />
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="gft3U" id="1pt0VTMHkiD" role="14YRTM">
-          <node concept="2YIFZM" id="1pt0VTMHl1v" role="gfFT$">
-            <ref role="37wK5l" to="ie8e:uNmovXjpCg" resolve="variable" />
-            <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-            <node concept="Xl_RD" id="1pt0VTMHl1w" role="37wK5m">
-              <property role="Xl_RC" value="name" />
-              <node concept="17Uvod" id="1pt0VTMHl1x" role="lGtFl">
-                <property role="2qtEX9" value="value" />
-                <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-                <node concept="3zFVjK" id="1pt0VTMHl1y" role="3zH0cK">
-                  <node concept="3clFbS" id="1pt0VTMHl1z" role="2VODD2">
-                    <node concept="3clFbF" id="1pt0VTMHl1$" role="3cqZAp">
-                      <node concept="2OqwBi" id="1pt0VTMHl1_" role="3clFbG">
-                        <node concept="30H73N" id="1pt0VTMHl1A" role="2Oq$k0" />
-                        <node concept="3TrcHB" id="1pt0VTMHl1B" role="2OqNvi">
-                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
-                        </node>
-                      </node>
-                    </node>
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-              </node>
-            </node>
-            <node concept="10Nm6u" id="1pt0VTMHl1C" role="37wK5m">
-              <node concept="2b32R4" id="1pt0VTMHl1D" role="lGtFl">
-                <node concept="3JmXsc" id="1pt0VTMHl1E" role="2P8S$">
-                  <node concept="3clFbS" id="1pt0VTMHl1F" role="2VODD2">
-                    <node concept="3clFbF" id="1pt0VTMHl1G" role="3cqZAp">
-                      <node concept="2OqwBi" id="1pt0VTMHl1H" role="3clFbG">
-                        <node concept="3Tsc0h" id="1pt0VTMHl1I" role="2OqNvi">
-                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
-                        </node>
-                        <node concept="30H73N" id="1pt0VTMHl1J" role="2Oq$k0" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="30G5F_" id="1pt0VTMG$m6" role="30HLyM">
-        <node concept="3clFbS" id="1pt0VTMG$m7" role="2VODD2">
-          <node concept="3clFbF" id="38jpnomYTN_" role="3cqZAp">
-            <node concept="2OqwBi" id="38jpnomYUB6" role="3clFbG">
-              <node concept="2OqwBi" id="38jpnomYTTK" role="2Oq$k0">
-                <node concept="30H73N" id="38jpnomYTNz" role="2Oq$k0" />
-                <node concept="3TrcHB" id="38jpnomYUdK" role="2OqNvi">
-                  <ref role="3TsBF5" to="5j4j:6$jH9oLmYHk" resolve="cardinality" />
-                </node>
-              </node>
-              <node concept="3t7uKx" id="38jpnomYWt0" role="2OqNvi">
-                <node concept="uoxfO" id="38jpnomYWt2" role="3t7uKA">
-                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYG1" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="3aamgX" id="1pt0VTMG_yc" role="3acgRq">
-      <ref role="30HIoZ" to="5j4j:6$jH9oLmYEJ" resolve="ChildRole" />
-      <node concept="30G5F_" id="1pt0VTMG_zC" role="30HLyM">
-        <node concept="3clFbS" id="1pt0VTMG_zD" role="2VODD2">
-          <node concept="3clFbF" id="38jpnomZ1tl" role="3cqZAp">
-            <node concept="2OqwBi" id="38jpnomZ2nk" role="3clFbG">
-              <node concept="2OqwBi" id="38jpnomZ1zw" role="2Oq$k0">
-                <node concept="30H73N" id="38jpnomZ1tj" role="2Oq$k0" />
-                <node concept="3TrcHB" id="38jpnomZ1Rw" role="2OqNvi">
-                  <ref role="3TsBF5" to="5j4j:6$jH9oLmYHk" resolve="cardinality" />
-                </node>
-              </node>
-              <node concept="3t7uKx" id="38jpnomZ3qk" role="2OqNvi">
-                <node concept="uoxfO" id="38jpnomZ3qm" role="3t7uKA">
-                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYGZ" />
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-              </node>
-            </node>
-          </node>
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-      <node concept="gft3U" id="1pt0VTMG_zm" role="1lVwrX">
-        <node concept="2YIFZM" id="104EUzFx19o" role="gfFT$">
-          <ref role="37wK5l" to="ie8e:6$jH9oLaYQA" resolve="childrenList" />
-          <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
-          <node concept="Xl_RD" id="104EUzFx19p" role="37wK5m">
-            <property role="Xl_RC" value="name" />
-            <node concept="17Uvod" id="104EUzFx19q" role="lGtFl">
-              <property role="2qtEX9" value="value" />
-              <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-              <node concept="3zFVjK" id="104EUzFx19r" role="3zH0cK">
-                <node concept="3clFbS" id="104EUzFx19s" role="2VODD2">
-                  <node concept="3clFbF" id="104EUzFx19t" role="3cqZAp">
-                    <node concept="2OqwBi" id="104EUzFx19u" role="3clFbG">
-                      <node concept="30H73N" id="104EUzFx19v" role="2Oq$k0" />
-                      <node concept="3TrcHB" id="104EUzFx19w" role="2OqNvi">
-                        <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
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-                    </node>
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-            </node>
-          </node>
-          <node concept="10Nm6u" id="104EUzFx19x" role="37wK5m">
-            <node concept="2b32R4" id="104EUzFx19y" role="lGtFl">
-              <node concept="3JmXsc" id="104EUzFx19z" role="2P8S$">
-                <node concept="3clFbS" id="104EUzFx19$" role="2VODD2">
-                  <node concept="3clFbF" id="104EUzFx19_" role="3cqZAp">
-                    <node concept="2OqwBi" id="104EUzFx19A" role="3clFbG">
-                      <node concept="3Tsc0h" id="104EUzFx19B" role="2OqNvi">
-                        <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
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-                      <node concept="30H73N" id="104EUzFx19C" role="2Oq$k0" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
+      <node concept="gft3U" id="1OShD0H$IiL" role="1lVwrX">
+        <node concept="1oi5ST" id="1OShD0H$I_c" role="gfFT$">
+          <property role="TrG5h" value="role" />
+          <node concept="1sPUBX" id="1OShD0H$I_g" role="lGtFl">
+            <ref role="v9R2y" node="1OShD0H$ohx" resolve="ChildRole" />
           </node>
         </node>
       </node>
     </node>
     <node concept="3aamgX" id="1pt0VTMwUQ$" role="3acgRq">
       <ref role="30HIoZ" to="5j4j:6$jH9oLmYJ_" resolve="ValueHolder" />
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-          <property role="Xl_RC" value="value" />
-          <node concept="17Uvod" id="1pt0VTMwVyG" role="lGtFl">
-            <property role="2qtEX9" value="value" />
-            <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
-            <node concept="3zFVjK" id="1pt0VTMwVyJ" role="3zH0cK">
-              <node concept="3clFbS" id="1pt0VTMwVyK" role="2VODD2">
-                <node concept="3clFbF" id="1pt0VTMwVyQ" role="3cqZAp">
-                  <node concept="2OqwBi" id="1pt0VTMwVyL" role="3clFbG">
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-                    </node>
-                    <node concept="30H73N" id="1pt0VTMwVyP" role="2Oq$k0" />
-                  </node>
-                </node>
-              </node>
-            </node>
+      <node concept="gft3U" id="1OShD0H_tef" role="1lVwrX">
+        <node concept="1oi5XN" id="1OShD0H_tel" role="gfFT$">
+          <property role="1oi5yK" value="value" />
+          <node concept="1sPUBX" id="1OShD0H_tep" role="lGtFl">
+            <ref role="v9R2y" node="1OShD0H_ppr" resolve="ValueHolder" />
           </node>
         </node>
       </node>
@@ -1212,6 +904,16 @@
         </node>
       </node>
     </node>
+    <node concept="3aamgX" id="1OShD0HSv5l" role="3acgRq">
+      <ref role="30HIoZ" to="5j4j:1OShD0HAY6y" resolve="ListNode" />
+      <node concept="gft3U" id="1OShD0HSxdO" role="1lVwrX">
+        <node concept="KCUsM" id="1OShD0HSxdU" role="gfFT$">
+          <node concept="1sPUBX" id="1OShD0HSxdY" role="lGtFl">
+            <ref role="v9R2y" node="1OShD0HRO_l" resolve="ListNode" />
+          </node>
+        </node>
+      </node>
+    </node>
   </node>
   <node concept="312cEu" id="35Lj3TiR8No">
     <property role="TrG5h" value="Forest" />
@@ -1277,9 +979,7 @@
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         <node concept="3clFbF" id="35Lj3TiSoNN" role="3cqZAp">
           <node concept="1oi1Uc" id="35Lj3TiSoNH" role="3clFbG">
-            <node concept="1oi5UN" id="35Lj3TiSoNJ" role="1oi0x0">
-              <node concept="1ojpPn" id="35Lj3TiSoNL" role="1KAndV" />
-            </node>
+            <node concept="1oi5UN" id="35Lj3TiSoNJ" role="1oi0x0" />
             <node concept="xERo3" id="35Lj3TiT8Id" role="lGtFl">
               <ref role="xH3mL" node="35Lj3TiT1Wl" resolve="Ast_Builder" />
             </node>
@@ -1397,5 +1097,1484 @@
       <node concept="raruj" id="35Lj3TiT5EM" role="lGtFl" />
     </node>
   </node>
+  <node concept="bUwia" id="7E86$tKtJwT">
+    <property role="TrG5h" value="logical" />
+    <node concept="2rT7sh" id="7E86$tKuvNp" role="2rTMjI">
+      <property role="TrG5h" value="logicalvar_declaration" />
+      <ref role="2rTdP9" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+      <ref role="2rZz_L" to="tpee:fzcpWvJ" resolve="LocalVariableDeclaration" />
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+    <node concept="3aamgX" id="7E86$tKtNCi" role="3acgRq">
+      <ref role="30HIoZ" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
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+        <node concept="3clFbS" id="7E86$tKtXRw" role="1Koe22">
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+            <node concept="3cpWsn" id="7E86$tKuXZG" role="3cpWs9">
+              <property role="TrG5h" value="$_card" />
+              <node concept="10Oyi0" id="7E86$tKuXYO" role="1tU5fm" />
+              <node concept="3cmrfG" id="7E86$tKuXZH" role="33vP2m">
+                <property role="3cmrfH" value="1" />
+                <node concept="29HgVG" id="7E86$tKuZuC" role="lGtFl">
+                  <node concept="3NFfHV" id="7E86$tKuZuD" role="3NFExx">
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+                    <node concept="3clFbS" id="1OShD0H$xoj" role="2VODD2">
+                      <node concept="3clFbF" id="1OShD0H$xok" role="3cqZAp">
+                        <node concept="2OqwBi" id="1OShD0H$xol" role="3clFbG">
+                          <node concept="30H73N" id="1OShD0H$xom" role="2Oq$k0" />
+                          <node concept="3TrcHB" id="1OShD0H$xon" role="2OqNvi">
+                            <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="10Nm6u" id="1OShD0H$xoo" role="37wK5m">
+                <node concept="2b32R4" id="1OShD0H$xop" role="lGtFl">
+                  <node concept="3JmXsc" id="1OShD0H$xoq" role="2P8S$">
+                    <node concept="3clFbS" id="1OShD0H$xor" role="2VODD2">
+                      <node concept="3clFbF" id="1OShD0H$xos" role="3cqZAp">
+                        <node concept="2OqwBi" id="1OShD0H$xot" role="3clFbG">
+                          <node concept="3Tsc0h" id="1OShD0H$xou" role="2OqNvi">
+                            <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
+                          </node>
+                          <node concept="30H73N" id="1OShD0H$xov" role="2Oq$k0" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="gft3U" id="1OShD0H$xow" role="14YRTM">
+          <node concept="2YIFZM" id="1OShD0H$xox" role="gfFT$">
+            <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
+            <ref role="37wK5l" to="ie8e:uNmovXjpCg" resolve="variable" />
+            <node concept="Xl_RD" id="1OShD0H$xoy" role="37wK5m">
+              <property role="Xl_RC" value="name" />
+              <node concept="17Uvod" id="1OShD0H$xoz" role="lGtFl">
+                <property role="2qtEX9" value="value" />
+                <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
+                <node concept="3zFVjK" id="1OShD0H$xo$" role="3zH0cK">
+                  <node concept="3clFbS" id="1OShD0H$xo_" role="2VODD2">
+                    <node concept="3clFbF" id="1OShD0H$xoA" role="3cqZAp">
+                      <node concept="2OqwBi" id="1OShD0H$xoB" role="3clFbG">
+                        <node concept="30H73N" id="1OShD0H$xoC" role="2Oq$k0" />
+                        <node concept="3TrcHB" id="1OShD0H$xoD" role="2OqNvi">
+                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="10Nm6u" id="1OShD0H$xoE" role="37wK5m">
+              <node concept="2b32R4" id="1OShD0H$xoF" role="lGtFl">
+                <node concept="3JmXsc" id="1OShD0H$xoG" role="2P8S$">
+                  <node concept="3clFbS" id="1OShD0H$xoH" role="2VODD2">
+                    <node concept="3clFbF" id="1OShD0H$xoI" role="3cqZAp">
+                      <node concept="2OqwBi" id="1OShD0H$xoJ" role="3clFbG">
+                        <node concept="3Tsc0h" id="1OShD0H$xoK" role="2OqNvi">
+                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
+                        </node>
+                        <node concept="30H73N" id="1OShD0H$xoL" role="2Oq$k0" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3aamgX" id="1OShD0H$ybc" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:6$jH9oLmYEJ" resolve="ChildRole" />
+      <node concept="30G5F_" id="1OShD0H$_lU" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0H$_lV" role="2VODD2">
+          <node concept="3clFbF" id="1OShD0H$_rt" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0H$_ru" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0H$_rv" role="2Oq$k0">
+                <node concept="30H73N" id="1OShD0H$_rw" role="2Oq$k0" />
+                <node concept="3TrcHB" id="1OShD0H$_rx" role="2OqNvi">
+                  <ref role="3TsBF5" to="5j4j:6$jH9oLmYHk" resolve="cardinality" />
+                </node>
+              </node>
+              <node concept="3t7uKx" id="1OShD0H$_ry" role="2OqNvi">
+                <node concept="uoxfO" id="1OShD0H$_rz" role="3t7uKA">
+                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYGZ" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="gft3U" id="1OShD0H$B7w" role="1lVwrX">
+        <node concept="2YIFZM" id="1OShD0H$B7x" role="gfFT$">
+          <ref role="37wK5l" to="ie8e:6$jH9oLaYQA" resolve="childrenList" />
+          <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
+          <node concept="Xl_RD" id="1OShD0H$B7y" role="37wK5m">
+            <property role="Xl_RC" value="name" />
+            <node concept="17Uvod" id="1OShD0H$B7z" role="lGtFl">
+              <property role="2qtEX9" value="value" />
+              <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
+              <node concept="3zFVjK" id="1OShD0H$B7$" role="3zH0cK">
+                <node concept="3clFbS" id="1OShD0H$B7_" role="2VODD2">
+                  <node concept="3clFbF" id="1OShD0H$B7A" role="3cqZAp">
+                    <node concept="2OqwBi" id="1OShD0H$B7B" role="3clFbG">
+                      <node concept="30H73N" id="1OShD0H$B7C" role="2Oq$k0" />
+                      <node concept="3TrcHB" id="1OShD0H$B7D" role="2OqNvi">
+                        <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="10Nm6u" id="1OShD0H$B7E" role="37wK5m">
+            <node concept="2b32R4" id="1OShD0H$B7F" role="lGtFl">
+              <node concept="3JmXsc" id="1OShD0H$B7G" role="2P8S$">
+                <node concept="3clFbS" id="1OShD0H$B7H" role="2VODD2">
+                  <node concept="3clFbF" id="1OShD0H$B7I" role="3cqZAp">
+                    <node concept="2OqwBi" id="1OShD0H$B7J" role="3clFbG">
+                      <node concept="3Tsc0h" id="1OShD0H$B7K" role="2OqNvi">
+                        <ref role="3TtcxE" to="5j4j:6$jH9oLmYFB" />
+                      </node>
+                      <node concept="30H73N" id="1OShD0H$B7L" role="2Oq$k0" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="j$LIH" id="1OShD0H$BUA" role="jxRDz">
+      <node concept="1lLz0L" id="1OShD0H$CM8" role="1lHHLF">
+        <property role="1lMjX7" value="error" />
+        <property role="1lLB17" value="unsupported construct" />
+      </node>
+    </node>
+  </node>
+  <node concept="jVnub" id="1OShD0H$K$J">
+    <property role="TrG5h" value="ValueRole" />
+    <property role="3GE5qa" value="switch" />
+    <node concept="3aamgX" id="1OShD0H$KFl" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
+      <node concept="30G5F_" id="1OShD0H$LSh" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0H$LSi" role="2VODD2">
+          <node concept="3clFbF" id="1OShD0H$Q_S" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0H$Q_T" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0H$Q_U" role="2Oq$k0">
+                <node concept="30H73N" id="1OShD0H$Q_V" role="2Oq$k0" />
+                <node concept="3CFZ6_" id="1OShD0H$Q_W" role="2OqNvi">
+                  <node concept="3CFYIy" id="1OShD0H$Q_X" role="3CFYIz">
+                    <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3x8VRR" id="1OShD0H$Q_Y" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="gft3U" id="1OShD0H$RMv" role="1lVwrX">
+        <node concept="10Nm6u" id="1OShD0H$RMw" role="gfFT$">
+          <node concept="29HgVG" id="1OShD0H$RMx" role="lGtFl">
+            <node concept="3NFfHV" id="1OShD0H$RMy" role="3NFExx">
+              <node concept="3clFbS" id="1OShD0H$RMz" role="2VODD2">
+                <node concept="3clFbF" id="1OShD0H$RM$" role="3cqZAp">
+                  <node concept="2OqwBi" id="1OShD0H$RM_" role="3clFbG">
+                    <node concept="30H73N" id="1OShD0H$RMA" role="2Oq$k0" />
+                    <node concept="3CFZ6_" id="1OShD0H$RMB" role="2OqNvi">
+                      <node concept="3CFYIy" id="1OShD0H$RMC" role="3CFYIz">
+                        <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3aamgX" id="1OShD0H$TcI" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
+      <node concept="30G5F_" id="1OShD0H$TBa" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0H$TBb" role="2VODD2">
+          <node concept="3SKdUt" id="1OShD0H$TGN" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0H$TGO" role="3SKWNk">
+              <property role="3SKdUp" value="TODO merge with other role" />
+            </node>
+          </node>
+          <node concept="3clFbF" id="1OShD0H$TGP" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0H$TGQ" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0H$TGR" role="2Oq$k0">
+                <node concept="30H73N" id="1OShD0H$TGS" role="2Oq$k0" />
+                <node concept="3TrcHB" id="1OShD0H$TGT" role="2OqNvi">
+                  <ref role="3TsBF5" to="5j4j:6$jH9oLmYHk" resolve="cardinality" />
+                </node>
+              </node>
+              <node concept="3t7uKx" id="1OShD0H$TGU" role="2OqNvi">
+                <node concept="uoxfO" id="1OShD0H$TGV" role="3t7uKA">
+                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYG1" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="14YyZ8" id="1OShD0H$V2X" role="1lVwrX">
+        <node concept="14ZrTv" id="1OShD0H$V2Y" role="14ZwWg">
+          <node concept="30G5F_" id="1OShD0H$V2Z" role="150hEN">
+            <node concept="3clFbS" id="1OShD0H$V30" role="2VODD2">
+              <node concept="3clFbF" id="1OShD0H$V31" role="3cqZAp">
+                <node concept="3fqX7Q" id="1OShD0H$V32" role="3clFbG">
+                  <node concept="2OqwBi" id="1OShD0H$V33" role="3fr31v">
+                    <node concept="2OqwBi" id="1OShD0H$V34" role="2Oq$k0">
+                      <node concept="2OqwBi" id="1OShD0H$V35" role="2Oq$k0">
+                        <node concept="30H73N" id="1OShD0H$V36" role="2Oq$k0" />
+                        <node concept="3Tsc0h" id="1OShD0H$V37" role="2OqNvi">
+                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
+                        </node>
+                      </node>
+                      <node concept="1uHKPH" id="1OShD0H$V38" role="2OqNvi" />
+                    </node>
+                    <node concept="1mIQ4w" id="1OShD0H$V39" role="2OqNvi">
+                      <node concept="chp4Y" id="1OShD0H$V3a" role="cj9EA">
+                        <ref role="cht4Q" to="5j4j:6SkxsM$4k7r" resolve="AbstractVariable" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="gft3U" id="1OShD0H$V3b" role="150oIE">
+            <node concept="2YIFZM" id="1OShD0H$V3c" role="gfFT$">
+              <ref role="37wK5l" to="ie8e:5JQSuNsx4I5" resolve="value" />
+              <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
+              <node concept="Xl_RD" id="1OShD0H$V3d" role="37wK5m">
+                <property role="Xl_RC" value="name" />
+                <node concept="17Uvod" id="1OShD0H$V3e" role="lGtFl">
+                  <property role="2qtEX9" value="value" />
+                  <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
+                  <node concept="3zFVjK" id="1OShD0H$V3f" role="3zH0cK">
+                    <node concept="3clFbS" id="1OShD0H$V3g" role="2VODD2">
+                      <node concept="3clFbF" id="1OShD0H$V3h" role="3cqZAp">
+                        <node concept="2OqwBi" id="1OShD0H$V3i" role="3clFbG">
+                          <node concept="30H73N" id="1OShD0H$V3j" role="2Oq$k0" />
+                          <node concept="3TrcHB" id="1OShD0H$V3k" role="2OqNvi">
+                            <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="10Nm6u" id="1OShD0H$V3l" role="37wK5m">
+                <node concept="2b32R4" id="1OShD0H$V3m" role="lGtFl">
+                  <node concept="3JmXsc" id="1OShD0H$V3n" role="2P8S$">
+                    <node concept="3clFbS" id="1OShD0H$V3o" role="2VODD2">
+                      <node concept="3clFbF" id="1OShD0H$V3p" role="3cqZAp">
+                        <node concept="2OqwBi" id="1OShD0H$V3q" role="3clFbG">
+                          <node concept="3Tsc0h" id="1OShD0H$V3r" role="2OqNvi">
+                            <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
+                          </node>
+                          <node concept="30H73N" id="1OShD0H$V3s" role="2Oq$k0" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="gft3U" id="1OShD0H$V3t" role="14YRTM">
+          <node concept="2YIFZM" id="1OShD0H$V3u" role="gfFT$">
+            <ref role="1Pybhc" to="ie8e:5JQSuNsx4Gq" resolve="Builder" />
+            <ref role="37wK5l" to="ie8e:uNmovXjpCg" resolve="variable" />
+            <node concept="Xl_RD" id="1OShD0H$V3v" role="37wK5m">
+              <property role="Xl_RC" value="name" />
+              <node concept="17Uvod" id="1OShD0H$V3w" role="lGtFl">
+                <property role="2qtEX9" value="value" />
+                <property role="P4ACc" value="f3061a53-9226-4cc5-a443-f952ceaf5816/1070475926800/1070475926801" />
+                <node concept="3zFVjK" id="1OShD0H$V3x" role="3zH0cK">
+                  <node concept="3clFbS" id="1OShD0H$V3y" role="2VODD2">
+                    <node concept="3clFbF" id="1OShD0H$V3z" role="3cqZAp">
+                      <node concept="2OqwBi" id="1OShD0H$V3$" role="3clFbG">
+                        <node concept="30H73N" id="1OShD0H$V3_" role="2Oq$k0" />
+                        <node concept="3TrcHB" id="1OShD0H$V3A" role="2OqNvi">
+                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="10Nm6u" id="1OShD0H$V3B" role="37wK5m">
+              <node concept="2b32R4" id="1OShD0H$V3C" role="lGtFl">
+                <node concept="3JmXsc" id="1OShD0H$V3D" role="2P8S$">
+                  <node concept="3clFbS" id="1OShD0H$V3E" role="2VODD2">
+                    <node concept="3clFbF" id="1OShD0H$V3F" role="3cqZAp">
+                      <node concept="2OqwBi" id="1OShD0H$V3G" role="3clFbG">
+                        <node concept="3Tsc0h" id="1OShD0H$V3H" role="2OqNvi">
+                          <ref role="3TtcxE" to="5j4j:6$jH9oLmYL8" />
+                        </node>
+                        <node concept="30H73N" id="1OShD0H$V3I" role="2Oq$k0" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3aamgX" id="1OShD0H$X9$" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
+      <node concept="30G5F_" id="1OShD0H$YEr" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0H$YEs" role="2VODD2">
+          <node concept="3SKdUt" id="1OShD0H$YKa" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0H$YKb" role="3SKWNk">
+              <property role="3SKdUp" value="TODO merge with other role" />
+            </node>
+          </node>
+          <node concept="3SKdUt" id="1OShD0H$YKc" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0H$YKd" role="3SKWNk">
+              <property role="3SKdUp" value="TODO this condition is never satisfied in practice, remove this use case?" />
+            </node>
+          </node>
+          <node concept="3clFbF" id="1OShD0H$YKe" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0H$YKf" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0H$YKg" role="2Oq$k0">
+                <node concept="30H73N" id="1OShD0H$YKh" role="2Oq$k0" />
+                <node concept="3TrcHB" id="1OShD0H$YKi" role="2OqNvi">
+                  <ref role="3TsBF5" to="5j4j:6$jH9oLmYHk" resolve="cardinality" />
+                </node>
+              </node>
+              <node concept="3t7uKx" id="1OShD0H$YKj" role="2OqNvi">
+                <node concept="uoxfO" id="1OShD0H$YKk" role="3t7uKA">
+                  <ref role="uo_Cq" to="5j4j:6$jH9oLmYGZ" />
+                </node>
+              </node>
+            </node>
+          </node>
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+                  <node concept="3clFbF" id="1OShD0H_UVk" role="3cqZAp">
+                    <node concept="2OqwBi" id="1OShD0H_UVf" role="3clFbG">
+                      <node concept="3TrcHB" id="1OShD0H_UVi" role="2OqNvi">
+                        <ref role="3TsBF5" to="5j4j:6$jH9oLmYKA" resolve="value" />
+                      </node>
+                      <node concept="30H73N" id="1OShD0H_UVj" role="2Oq$k0" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="30G5F_" id="1OShD0H_V9b" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0H_V9c" role="2VODD2">
+          <node concept="3clFbF" id="1OShD0H_Vl$" role="3cqZAp">
+            <node concept="3fqX7Q" id="1OShD0H_VCm" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0H_VCn" role="3fr31v">
+                <node concept="2OqwBi" id="1OShD0H_VCo" role="2Oq$k0">
+                  <node concept="30H73N" id="1OShD0H_VCp" role="2Oq$k0" />
+                  <node concept="1mfA1w" id="1OShD0H_VCq" role="2OqNvi" />
+                </node>
+                <node concept="1mIQ4w" id="1OShD0H_VCr" role="2OqNvi">
+                  <node concept="chp4Y" id="1OShD0H_VCs" role="cj9EA">
+                    <ref role="cht4Q" to="5j4j:6$jH9oLmYI0" resolve="ValueRole" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="jVnub" id="1OShD0HRO_l">
+    <property role="3GE5qa" value="switch" />
+    <property role="TrG5h" value="ListNode" />
+    <node concept="3aamgX" id="1OShD0HTfRQ" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:1OShD0HAY6y" resolve="ListNode" />
+      <node concept="30G5F_" id="1OShD0HTgtU" role="30HLyM">
+        <node concept="3clFbS" id="1OShD0HTgtV" role="2VODD2">
+          <node concept="3clFbF" id="1OShD0HTi9Y" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0HTi9Z" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0HTia0" role="2Oq$k0">
+                <node concept="30H73N" id="1OShD0HTia1" role="2Oq$k0" />
+                <node concept="3CFZ6_" id="1OShD0HTia2" role="2OqNvi">
+                  <node concept="3CFYIy" id="1OShD0HTia3" role="3CFYIz">
+                    <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3x8VRR" id="1OShD0HTia4" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="gft3U" id="1OShD0HTjxQ" role="1lVwrX">
+        <node concept="10Nm6u" id="1OShD0HTjxR" role="gfFT$">
+          <node concept="29HgVG" id="1OShD0HTjxS" role="lGtFl">
+            <node concept="3NFfHV" id="1OShD0HTjxT" role="3NFExx">
+              <node concept="3clFbS" id="1OShD0HTjxU" role="2VODD2">
+                <node concept="3clFbF" id="1OShD0HTjxV" role="3cqZAp">
+                  <node concept="2OqwBi" id="1OShD0HTjxW" role="3clFbG">
+                    <node concept="30H73N" id="1OShD0HTjxX" role="2Oq$k0" />
+                    <node concept="3CFZ6_" id="1OShD0HTjxY" role="2OqNvi">
+                      <node concept="3CFYIy" id="1OShD0HTjxZ" role="3CFYIz">
+                        <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3aamgX" id="1OShD0HRO_m" role="3aUrZf">
+      <property role="36QftV" value="true" />
+      <ref role="30HIoZ" to="5j4j:1OShD0HAY6y" resolve="ListNode" />
+      <node concept="gft3U" id="1OShD0HSnMP" role="1lVwrX">
+        <node concept="2YIFZM" id="1OShD0HSnMZ" role="gfFT$">
+          <ref role="37wK5l" to="ie8e:1OShD0HS45f" resolve="createList" />
+          <ref role="1Pybhc" to="ie8e:3OPtF03lco4" resolve="ListBranch" />
+          <node concept="10Nm6u" id="1OShD0HSoP5" role="37wK5m">
+            <node concept="2b32R4" id="1OShD0HSoRm" role="lGtFl">
+              <node concept="3JmXsc" id="1OShD0HSoRp" role="2P8S$">
+                <node concept="3clFbS" id="1OShD0HSoRq" role="2VODD2">
+                  <node concept="3clFbF" id="1OShD0HSoRw" role="3cqZAp">
+                    <node concept="2OqwBi" id="1OShD0HSoRr" role="3clFbG">
+                      <node concept="3Tsc0h" id="1OShD0HSoRu" role="2OqNvi">
+                        <ref role="3TtcxE" to="5j4j:1OShD0HAZ38" />
+                      </node>
+                      <node concept="30H73N" id="1OShD0HSoRv" role="2Oq$k0" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/jetbrains.mps.logic.mpl b/languages/jetbrains.mps.logic/jetbrains.mps.logic.mpl
index abd6b4fc..5c05eeeb 100644
--- a/languages/jetbrains.mps.logic/jetbrains.mps.logic.mpl
+++ b/languages/jetbrains.mps.logic/jetbrains.mps.logic.mpl
@@ -72,6 +72,11 @@
     <dependency reexport="false">1ed103c3-3aa6-49b7-9c21-6765ee11f224(MPS.Editor)</dependency>
     <dependency reexport="false">8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)</dependency>
     <dependency reexport="false">7526e0cf-1ce7-46f8-a555-9eca1e06c23b(jetbrains.mps.unification.tree)</dependency>
+    <dependency reexport="false">f3061a53-9226-4cc5-a443-f952ceaf5816(jetbrains.mps.baseLanguage)</dependency>
+    <dependency reexport="false">2d3c70e9-aab2-4870-8d8d-6036800e4103(jetbrains.mps.kernel)</dependency>
+    <dependency reexport="false">e39e4a59-8cb6-498e-860e-8fa8361c0d90(jetbrains.mps.baseLanguage.scopes)</dependency>
+    <dependency reexport="false">ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)</dependency>
+    <dependency reexport="false">a5478664-6b44-4c62-a9f7-434f8aa57eee(jetbrains.mps.logic.runtime)</dependency>
   </dependencies>
   <usedLanguages>
     <usedLanguage>daafa647-f1f7-4b0b-b096-69cd7c8408c0(jetbrains.mps.baseLanguage.regexp)</usedLanguage>
diff --git a/languages/jetbrains.mps.logic/languageModels/actions.mps b/languages/jetbrains.mps.logic/languageModels/actions.mps
index d48782a3..ad77dd85 100644
--- a/languages/jetbrains.mps.logic/languageModels/actions.mps
+++ b/languages/jetbrains.mps.logic/languageModels/actions.mps
@@ -90,6 +90,7 @@
         <child id="1177498207384" name="handler" index="Cncma" />
       </concept>
       <concept id="1177498227294" name="jetbrains.mps.lang.actions.structure.QueryFunction_SideTransform_Handler" flags="in" index="Cnhdc" />
+      <concept id="767145758118872830" name="jetbrains.mps.lang.actions.structure.NF_Link_SetNewChildOperation" flags="nn" index="2DeJnY" />
       <concept id="1180111159572" name="jetbrains.mps.lang.actions.structure.IncludeRightTransformForNodePart" flags="ng" index="346O06">
         <child id="1180111489972" name="nodeBlock" index="3484EA" />
       </concept>
@@ -117,6 +118,7 @@
         <reference id="6973815483243564601" name="enum" index="3f7vo2" />
       </concept>
       <concept id="1139613262185" name="jetbrains.mps.lang.smodel.structure.Node_GetParentOperation" flags="nn" index="1mfA1w" />
+      <concept id="1171999116870" name="jetbrains.mps.lang.smodel.structure.Node_IsNullOperation" flags="nn" index="3w_OXm" />
       <concept id="1140137987495" name="jetbrains.mps.lang.smodel.structure.SNodeTypeCastExpression" flags="nn" index="1PxgMI">
         <property id="1238684351431" name="asCast" index="1BlNFB" />
         <reference id="1140138128738" name="concept" index="1PxNhF" />
@@ -125,11 +127,17 @@
       <concept id="1138056022639" name="jetbrains.mps.lang.smodel.structure.SPropertyAccess" flags="nn" index="3TrcHB">
         <reference id="1138056395725" name="property" index="3TsBF5" />
       </concept>
+      <concept id="1138056143562" name="jetbrains.mps.lang.smodel.structure.SLinkAccess" flags="nn" index="3TrEf2">
+        <reference id="1138056516764" name="link" index="3Tt5mk" />
+      </concept>
       <concept id="1138056282393" name="jetbrains.mps.lang.smodel.structure.SLinkListAccess" flags="nn" index="3Tsc0h">
         <reference id="1138056546658" name="link" index="3TtcxE" />
       </concept>
     </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
@@ -182,12 +190,6 @@
                                   <ref role="3f7vo2" to="5j4j:5A$IBX$fPei" resolve="StandardValue" />
                                 </node>
                               </node>
-                              <node concept="2pIpSj" id="5iubxWjiDk5" role="2pJxcM">
-                                <ref role="2pIpSl" to="5j4j:5lJXKB2m4" />
-                                <node concept="2pJPED" id="5iubxWjiDzk" role="2pJxcZ">
-                                  <ref role="2pJxaS" to="5j4j:6$jH9oLnyB1" resolve="Symbol" />
-                                </node>
-                              </node>
                             </node>
                           </node>
                         </node>
@@ -204,23 +206,11 @@
                             <ref role="2pIpSl" to="5j4j:6$jH9oLmYL8" />
                             <node concept="2pJPED" id="38jpnomYpu3" role="2pJxcZ">
                               <ref role="2pJxaS" to="5j4j:6$jH9oLmYJ_" resolve="ValueHolder" />
-                              <node concept="2pIpSj" id="5iubxWjiDMP" role="2pJxcM">
-                                <ref role="2pIpSl" to="5j4j:5lJXKB2m4" />
-                                <node concept="2pJPED" id="5iubxWjiDQe" role="2pJxcZ">
-                                  <ref role="2pJxaS" to="5j4j:6$jH9oLnyB1" resolve="Symbol" />
-                                </node>
-                              </node>
                             </node>
                           </node>
                         </node>
                       </node>
                     </node>
-                    <node concept="2pIpSj" id="5A$IBX$gNto" role="2pJxcM">
-                      <ref role="2pIpSl" to="5j4j:5lJXKB2m4" />
-                      <node concept="2pJPED" id="38jpnomYDRA" role="2pJxcZ">
-                        <ref role="2pJxaS" to="5j4j:6$jH9oLnyB1" resolve="Symbol" />
-                      </node>
-                    </node>
                   </node>
                 </node>
               </node>
@@ -371,5 +361,101 @@
       </node>
     </node>
   </node>
+  <node concept="3UOs0u" id="7E86$tKsKAH">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalVariable_addIndex" />
+    <node concept="3UNGvq" id="7E86$tKsKAI" role="3UOs0v">
+      <ref role="3UNGvu" to="5j4j:7E86$tKsHeX" resolve="AbstractLogicalVariable" />
+      <node concept="3kRJcU" id="7E86$tKsLe$" role="3kShCk">
+        <node concept="3clFbS" id="7E86$tKsLe_" role="2VODD2">
+          <node concept="3clFbF" id="6p0DfM0n_Ot" role="3cqZAp">
+            <node concept="2OqwBi" id="6p0DfM0nAQ2" role="3clFbG">
+              <node concept="2OqwBi" id="6p0DfM0n_WA" role="2Oq$k0">
+                <node concept="Cj7Ep" id="6p0DfM0n_Os" role="2Oq$k0" />
+                <node concept="3TrEf2" id="7E86$tKsY3y" role="2OqNvi">
+                  <ref role="3Tt5mk" to="5j4j:7E86$tKsJfa" />
+                </node>
+              </node>
+              <node concept="3w_OXm" id="6p0DfM0nB4j" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="tYCnQ" id="7E86$tKsYzY" role="_1QTJ">
+        <ref role="uz4UX" to="5j4j:7E86$tKsHeX" resolve="AbstractLogicalVariable" />
+        <node concept="Cmt7Y" id="7E86$tKsZ1o" role="uz6Si">
+          <node concept="Cnhdc" id="7E86$tKsZ1p" role="Cncma">
+            <node concept="3clFbS" id="7E86$tKsZ1q" role="2VODD2">
+              <node concept="3clFbF" id="7E86$tKsZmQ" role="3cqZAp">
+                <node concept="2OqwBi" id="7E86$tKt04j" role="3clFbG">
+                  <node concept="2OqwBi" id="7E86$tKsZpS" role="2Oq$k0">
+                    <node concept="Cj7Ep" id="7E86$tKsZmP" role="2Oq$k0" />
+                    <node concept="3TrEf2" id="7E86$tKsZS4" role="2OqNvi">
+                      <ref role="3Tt5mk" to="5j4j:7E86$tKsJfa" />
+                    </node>
+                  </node>
+                  <node concept="2DeJnY" id="7E86$tKt0pZ" role="2OqNvi" />
+                </node>
+              </node>
+              <node concept="3clFbF" id="7E86$tKt0zS" role="3cqZAp">
+                <node concept="Cj7Ep" id="7E86$tKt0zQ" role="3clFbG" />
+              </node>
+            </node>
+          </node>
+          <node concept="2h1dTh" id="7E86$tKsZ4o" role="Cn2iK">
+            <property role="2h1i$Z" value="_" />
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="3UOs0u" id="7E86$tKtoxK">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalVariableDeclaratin_addCardinality" />
+    <node concept="3UNGvq" id="7E86$tKtoxL" role="3UOs0v">
+      <ref role="3UNGvu" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+      <node concept="tYCnQ" id="7E86$tKtsvh" role="_1QTJ">
+        <ref role="uz4UX" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+        <node concept="Cmt7Y" id="7E86$tKtsXI" role="uz6Si">
+          <node concept="Cnhdc" id="7E86$tKtsXJ" role="Cncma">
+            <node concept="3clFbS" id="7E86$tKtsXK" role="2VODD2">
+              <node concept="3clFbF" id="7E86$tKtt3R" role="3cqZAp">
+                <node concept="2OqwBi" id="7E86$tKttC$" role="3clFbG">
+                  <node concept="2OqwBi" id="7E86$tKtt6T" role="2Oq$k0">
+                    <node concept="Cj7Ep" id="7E86$tKtt3Q" role="2Oq$k0" />
+                    <node concept="3TrEf2" id="7E86$tKttqF" role="2OqNvi">
+                      <ref role="3Tt5mk" to="5j4j:7E86$tKtioV" />
+                    </node>
+                  </node>
+                  <node concept="2DeJnY" id="7E86$tKtu8E" role="2OqNvi" />
+                </node>
+              </node>
+              <node concept="3clFbF" id="7E86$tKtuhH" role="3cqZAp">
+                <node concept="Cj7Ep" id="7E86$tKtuhF" role="3clFbG" />
+              </node>
+            </node>
+          </node>
+          <node concept="2h1dTh" id="7E86$tKtt1$" role="Cn2iK">
+            <property role="2h1i$Z" value=":" />
+          </node>
+        </node>
+      </node>
+      <node concept="3kRJcU" id="7E86$tKtqyF" role="3kShCk">
+        <node concept="3clFbS" id="7E86$tKtqyG" role="2VODD2">
+          <node concept="3clFbF" id="7E86$tKtqHO" role="3cqZAp">
+            <node concept="2OqwBi" id="7E86$tKtrE3" role="3clFbG">
+              <node concept="2OqwBi" id="7E86$tKtqVy" role="2Oq$k0">
+                <node concept="Cj7Ep" id="7E86$tKtqHN" role="2Oq$k0" />
+                <node concept="3TrEf2" id="7E86$tKtriY" role="2OqNvi">
+                  <ref role="3Tt5mk" to="5j4j:7E86$tKtioV" />
+                </node>
+              </node>
+              <node concept="3w_OXm" id="7E86$tKts2l" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/behavior.mps b/languages/jetbrains.mps.logic/languageModels/behavior.mps
index 624a4507..0c3135ba 100644
--- a/languages/jetbrains.mps.logic/languageModels/behavior.mps
+++ b/languages/jetbrains.mps.logic/languageModels/behavior.mps
@@ -5,7 +5,76 @@
     <use id="af65afd8-f0dd-4942-87d9-63a55f2a9db1" name="jetbrains.mps.lang.behavior" version="-1" />
     <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
   </languages>
-  <imports />
-  <registry />
+  <imports>
+    <import index="5j4j" ref="r:c8fb1c5e-8204-4904-a38f-678899d447c1(jetbrains.mps.logic.structure)" implicit="true" />
+  </imports>
+  <registry>
+    <language id="af65afd8-f0dd-4942-87d9-63a55f2a9db1" name="jetbrains.mps.lang.behavior">
+      <concept id="1225194240794" name="jetbrains.mps.lang.behavior.structure.ConceptBehavior" flags="ng" index="13h7C7">
+        <reference id="1225194240799" name="concept" index="13h7C2" />
+        <child id="1225194240805" name="method" index="13h7CS" />
+        <child id="1225194240801" name="constructor" index="13h7CW" />
+      </concept>
+      <concept id="1225194413805" name="jetbrains.mps.lang.behavior.structure.ConceptConstructorDeclaration" flags="in" index="13hLZK" />
+      <concept id="1225194472830" name="jetbrains.mps.lang.behavior.structure.ConceptMethodDeclaration" flags="ng" index="13i0hz">
+        <property id="1225194472832" name="isVirtual" index="13i0it" />
+        <property id="1225194472834" name="isAbstract" index="13i0iv" />
+      </concept>
+    </language>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
+        <child id="1137022507850" name="body" index="2VODD2" />
+      </concept>
+      <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
+      <concept id="1068580123132" name="jetbrains.mps.baseLanguage.structure.BaseMethodDeclaration" flags="ng" index="3clF44">
+        <child id="1068580123133" name="returnType" index="3clF45" />
+        <child id="1068580123135" name="body" index="3clF47" />
+      </concept>
+      <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
+        <child id="1068580123156" name="expression" index="3clFbG" />
+      </concept>
+      <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
+        <child id="1068581517665" name="statement" index="3cqZAp" />
+      </concept>
+      <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
+        <child id="1178549979242" name="visibility" index="1B3o_S" />
+      </concept>
+      <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
+    </language>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="1145383075378" name="jetbrains.mps.lang.smodel.structure.SNodeListType" flags="in" index="2I9FWS">
+        <reference id="1145383142433" name="elementConcept" index="2I9WkF" />
+      </concept>
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="13h7C7" id="7E86$tKAuhI">
+    <property role="3GE5qa" value="logical" />
+    <ref role="13h7C2" to="5j4j:7E86$tK$Rgo" resolve="LogicalVariableScope" />
+    <node concept="13i0hz" id="7E86$tKAujJ" role="13h7CS">
+      <property role="13i0iv" value="false" />
+      <property role="13i0it" value="true" />
+      <property role="TrG5h" value="exportedLogicalVariable" />
+      <node concept="3Tm1VV" id="7E86$tKAujK" role="1B3o_S" />
+      <node concept="2I9FWS" id="7E86$tKAuon" role="3clF45">
+        <ref role="2I9WkF" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+      </node>
+      <node concept="3clFbS" id="7E86$tKAujM" role="3clF47">
+        <node concept="3clFbF" id="7E86$tKAuA2" role="3cqZAp">
+          <node concept="10Nm6u" id="7E86$tKAuA1" role="3clFbG" />
+        </node>
+      </node>
+    </node>
+    <node concept="13hLZK" id="7E86$tKAuhJ" role="13h7CW">
+      <node concept="3clFbS" id="7E86$tKAuhK" role="2VODD2" />
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/constraints.mps b/languages/jetbrains.mps.logic/languageModels/constraints.mps
index d82d57cb..d717effc 100644
--- a/languages/jetbrains.mps.logic/languageModels/constraints.mps
+++ b/languages/jetbrains.mps.logic/languageModels/constraints.mps
@@ -7,45 +7,204 @@
     <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
   </languages>
   <imports>
+    <import index="tpee" ref="r:00000000-0000-4000-0000-011c895902ca(jetbrains.mps.baseLanguage.structure)" />
+    <import index="o8zo" ref="r:314576fc-3aee-4386-a0a5-a38348ac317d(jetbrains.mps.scope)" />
+    <import index="fnmy" ref="r:89c0fb70-0977-4113-a076-5906f9d8630f(jetbrains.mps.baseLanguage.scopes)" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
+    <import index="e2lb" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/f:java_stub#6354ebe7-c22a-4a0f-ac54-50b52ab9b065#java.lang(JDK/java.lang@java_stub)" implicit="true" />
     <import index="tpfp" ref="r:00000000-0000-4000-0000-011c89590519(jetbrains.mps.baseLanguage.regexp.jetbrains.mps.regexp.accessory)" implicit="true" />
+    <import index="ha02" ref="r:09e53496-6477-45e7-abd5-eaf3fac3b360(jetbrains.mps.logic.behavior)" implicit="true" />
     <import index="5j4j" ref="r:c8fb1c5e-8204-4904-a38f-678899d447c1(jetbrains.mps.logic.structure)" implicit="true" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1215693861676" name="jetbrains.mps.baseLanguage.structure.BaseAssignmentExpression" flags="nn" index="d038R">
+        <child id="1068498886297" name="rValue" index="37vLTx" />
+        <child id="1068498886295" name="lValue" index="37vLTJ" />
+      </concept>
+      <concept id="4836112446988635817" name="jetbrains.mps.baseLanguage.structure.UndefinedType" flags="in" index="2jxLKc" />
+      <concept id="1465982738277781862" name="jetbrains.mps.baseLanguage.structure.PlaceholderMember" flags="ng" index="2tJIrI" />
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
       </concept>
+      <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
+        <child id="1145553007750" name="creator" index="2ShVmc" />
+      </concept>
       <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
         <child id="1137022507850" name="body" index="2VODD2" />
       </concept>
+      <concept id="1182160077978" name="jetbrains.mps.baseLanguage.structure.AnonymousClassCreator" flags="nn" index="YeOm9">
+        <child id="1182160096073" name="cls" index="YeSDq" />
+      </concept>
+      <concept id="1081236700937" name="jetbrains.mps.baseLanguage.structure.StaticMethodCall" flags="nn" index="2YIFZM">
+        <reference id="1144433194310" name="classConcept" index="1Pybhc" />
+      </concept>
+      <concept id="1164991038168" name="jetbrains.mps.baseLanguage.structure.ThrowStatement" flags="nn" index="YS8fn">
+        <child id="1164991057263" name="throwable" index="YScLw" />
+      </concept>
+      <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
+      <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
+        <child id="1068431790190" name="initializer" index="33vP2m" />
+      </concept>
+      <concept id="1068498886296" name="jetbrains.mps.baseLanguage.structure.VariableReference" flags="nn" index="37vLTw">
+        <reference id="1068581517664" name="variableDeclaration" index="3cqZAo" />
+      </concept>
+      <concept id="1068498886292" name="jetbrains.mps.baseLanguage.structure.ParameterDeclaration" flags="ir" index="37vLTG" />
+      <concept id="1068498886294" name="jetbrains.mps.baseLanguage.structure.AssignmentExpression" flags="nn" index="37vLTI" />
+      <concept id="1225271177708" name="jetbrains.mps.baseLanguage.structure.StringType" flags="in" index="17QB3L" />
+      <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
+        <child id="5680397130376446158" name="type" index="1tU5fm" />
+      </concept>
+      <concept id="1068580123132" name="jetbrains.mps.baseLanguage.structure.BaseMethodDeclaration" flags="ng" index="3clF44">
+        <child id="1068580123133" name="returnType" index="3clF45" />
+        <child id="1068580123134" name="parameter" index="3clF46" />
+        <child id="1068580123135" name="body" index="3clF47" />
+      </concept>
+      <concept id="1068580123165" name="jetbrains.mps.baseLanguage.structure.InstanceMethodDeclaration" flags="ig" index="3clFb_">
+        <property id="1178608670077" name="isAbstract" index="1EzhhJ" />
+      </concept>
       <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
         <child id="1068580123156" name="expression" index="3clFbG" />
       </concept>
+      <concept id="1068580123157" name="jetbrains.mps.baseLanguage.structure.Statement" flags="nn" index="3clFbH" />
+      <concept id="1068580123159" name="jetbrains.mps.baseLanguage.structure.IfStatement" flags="nn" index="3clFbJ">
+        <child id="1068580123160" name="condition" index="3clFbw" />
+        <child id="1068580123161" name="ifTrue" index="3clFbx" />
+        <child id="1206060520071" name="elsifClauses" index="3eNLev" />
+      </concept>
       <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
         <child id="1068581517665" name="statement" index="3cqZAp" />
       </concept>
+      <concept id="1068581242878" name="jetbrains.mps.baseLanguage.structure.ReturnStatement" flags="nn" index="3cpWs6">
+        <child id="1068581517676" name="expression" index="3cqZAk" />
+      </concept>
+      <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
+        <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
+      </concept>
+      <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
+      <concept id="1206060495898" name="jetbrains.mps.baseLanguage.structure.ElsifClause" flags="ng" index="3eNFk2">
+        <child id="1206060619838" name="condition" index="3eO9$A" />
+        <child id="1206060644605" name="statementList" index="3eOfB_" />
+      </concept>
+      <concept id="1204053956946" name="jetbrains.mps.baseLanguage.structure.IMethodCall" flags="ng" index="1ndlxa">
+        <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
+        <child id="1068499141038" name="actualArgument" index="37wK5m" />
+      </concept>
+      <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk" />
+      <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
+        <property id="521412098689998745" name="nonStatic" index="2bfB8j" />
+        <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
+      </concept>
+      <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
+        <reference id="1107535924139" name="classifier" index="3uigEE" />
+      </concept>
+      <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
+        <child id="1178549979242" name="visibility" index="1B3o_S" />
+      </concept>
+      <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
+      <concept id="1170345865475" name="jetbrains.mps.baseLanguage.structure.AnonymousClass" flags="ig" index="1Y3b0j">
+        <reference id="1170346070688" name="classifier" index="1Y3XeK" />
+      </concept>
     </language>
     <language id="3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1" name="jetbrains.mps.lang.constraints">
+      <concept id="8966504967485224688" name="jetbrains.mps.lang.constraints.structure.ConstraintFunctionParameter_contextNode" flags="nn" index="2rP1CM" />
       <concept id="1147467115080" name="jetbrains.mps.lang.constraints.structure.NodePropertyConstraint" flags="ng" index="EnEH3">
         <reference id="1147467295099" name="applicableProperty" index="EomxK" />
+        <child id="1147468630220" name="propertyGetter" index="EtsB7" />
         <child id="1212097481299" name="propertyValidator" index="QCWH9" />
+        <child id="1152963095733" name="propertySetter" index="1LXaQT" />
       </concept>
+      <concept id="1147467790433" name="jetbrains.mps.lang.constraints.structure.ConstraintFunction_PropertyGetter" flags="in" index="Eqf_E" />
+      <concept id="1147468365020" name="jetbrains.mps.lang.constraints.structure.ConstraintsFunctionParameter_node" flags="nn" index="EsrRn" />
       <concept id="1212096972063" name="jetbrains.mps.lang.constraints.structure.ConstraintFunction_PropertyValidator" flags="in" index="QB0g5" />
+      <concept id="5676632058862809931" name="jetbrains.mps.lang.constraints.structure.ConstraintFunction_ReferentSearchScope_Scope" flags="in" index="13QW63" />
+      <concept id="1152959968041" name="jetbrains.mps.lang.constraints.structure.ConstraintFunction_PropertySetter" flags="in" index="1LLf8_" />
       <concept id="1213093968558" name="jetbrains.mps.lang.constraints.structure.ConceptConstraints" flags="ng" index="1M2fIO">
         <reference id="1213093996982" name="concept" index="1M2myG" />
         <child id="1213098023997" name="property" index="1MhHOB" />
+        <child id="1213100494875" name="referent" index="1Mr941" />
+      </concept>
+      <concept id="1148687176410" name="jetbrains.mps.lang.constraints.structure.NodeReferentConstraint" flags="ng" index="1N5Pfh">
+        <reference id="1148687202698" name="applicableLink" index="1N5Vy1" />
+        <child id="1148687345559" name="searchScopeFactory" index="1N6uqs" />
       </concept>
       <concept id="1153138554286" name="jetbrains.mps.lang.constraints.structure.ConstraintsFunctionParameter_propertyValue" flags="nn" index="1Wqviy" />
     </language>
+    <language id="fd392034-7849-419d-9071-12563d152375" name="jetbrains.mps.baseLanguage.closures">
+      <concept id="1235746970280" name="jetbrains.mps.baseLanguage.closures.structure.CompactInvokeFunctionExpression" flags="nn" index="2Sg_IR">
+        <child id="1235746996653" name="function" index="2SgG2M" />
+        <child id="1235747002942" name="parameter" index="2SgHGx" />
+      </concept>
+      <concept id="1199542442495" name="jetbrains.mps.baseLanguage.closures.structure.FunctionType" flags="in" index="1ajhzC">
+        <child id="1199542457201" name="resultType" index="1ajl9A" />
+        <child id="1199542501692" name="parameterType" index="1ajw0F" />
+      </concept>
+      <concept id="1199569711397" name="jetbrains.mps.baseLanguage.closures.structure.ClosureLiteral" flags="nn" index="1bVj0M">
+        <child id="1199569906740" name="parameter" index="1bW2Oz" />
+        <child id="1199569916463" name="body" index="1bW5cS" />
+      </concept>
+    </language>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="1177026924588" name="jetbrains.mps.lang.smodel.structure.RefConcept_Reference" flags="nn" index="chp4Y">
+        <reference id="1177026940964" name="conceptDeclaration" index="cht4Q" />
+      </concept>
+      <concept id="1138411891628" name="jetbrains.mps.lang.smodel.structure.SNodeOperation" flags="nn" index="eCIE_">
+        <child id="1144104376918" name="parameter" index="1xVPHs" />
+      </concept>
+      <concept id="1179409122411" name="jetbrains.mps.lang.smodel.structure.Node_ConceptMethodCall" flags="nn" index="2qgKlT" />
+      <concept id="1171407110247" name="jetbrains.mps.lang.smodel.structure.Node_GetAncestorOperation" flags="nn" index="2Xjw5R" />
+      <concept id="1171500988903" name="jetbrains.mps.lang.smodel.structure.Node_GetChildrenOperation" flags="nn" index="32TBzR" />
+      <concept id="1154546920561" name="jetbrains.mps.lang.smodel.structure.OperationParm_ConceptList" flags="ng" index="3gmYPX">
+        <child id="1154546920563" name="concept" index="3gmYPZ" />
+      </concept>
+      <concept id="1154546950173" name="jetbrains.mps.lang.smodel.structure.ConceptReference" flags="ng" index="3gn64h">
+        <reference id="1154546997487" name="concept" index="3gnhBz" />
+      </concept>
+      <concept id="1139621453865" name="jetbrains.mps.lang.smodel.structure.Node_IsInstanceOfOperation" flags="nn" index="1mIQ4w">
+        <child id="1177027386292" name="conceptArgument" index="cj9EA" />
+      </concept>
+      <concept id="1172008320231" name="jetbrains.mps.lang.smodel.structure.Node_IsNotNullOperation" flags="nn" index="3x8VRR" />
+      <concept id="1144100932627" name="jetbrains.mps.lang.smodel.structure.OperationParm_Inclusion" flags="ng" index="1xIGOp" />
+      <concept id="1144101972840" name="jetbrains.mps.lang.smodel.structure.OperationParm_Concept" flags="ng" index="1xMEDy">
+        <child id="1207343664468" name="conceptArgument" index="ri$Ld" />
+      </concept>
+      <concept id="1140137987495" name="jetbrains.mps.lang.smodel.structure.SNodeTypeCastExpression" flags="nn" index="1PxgMI">
+        <property id="1238684351431" name="asCast" index="1BlNFB" />
+        <reference id="1140138128738" name="concept" index="1PxNhF" />
+        <child id="1140138123956" name="leftExpression" index="1PxMeX" />
+      </concept>
+      <concept id="1138055754698" name="jetbrains.mps.lang.smodel.structure.SNodeType" flags="in" index="3Tqbb2" />
+      <concept id="1138056022639" name="jetbrains.mps.lang.smodel.structure.SPropertyAccess" flags="nn" index="3TrcHB">
+        <reference id="1138056395725" name="property" index="3TsBF5" />
+      </concept>
+      <concept id="1138056143562" name="jetbrains.mps.lang.smodel.structure.SLinkAccess" flags="nn" index="3TrEf2">
+        <reference id="1138056516764" name="link" index="3Tt5mk" />
+      </concept>
+      <concept id="1172424058054" name="jetbrains.mps.lang.smodel.structure.ConceptRefExpression" flags="nn" index="3TUQnm">
+        <reference id="1172424100906" name="conceptDeclaration" index="3TV0OU" />
+      </concept>
+    </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
         <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
       </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
     </language>
     <language id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp">
       <concept id="1222260469397" name="jetbrains.mps.baseLanguage.regexp.structure.MatchRegexpOperation" flags="nn" index="2kpEY9" />
+      <concept id="1179357154354" name="jetbrains.mps.baseLanguage.regexp.structure.MatchRegexpExpression" flags="nn" index="2nawOw">
+        <child id="1179357286898" name="inputExpression" index="2nb13w" />
+      </concept>
       <concept id="1174482804200" name="jetbrains.mps.baseLanguage.regexp.structure.PlusRegexp" flags="ng" index="1OClNT" />
+      <concept id="1174482808826" name="jetbrains.mps.baseLanguage.regexp.structure.StarRegexp" flags="ng" index="1OCmVF" />
+      <concept id="1174484562151" name="jetbrains.mps.baseLanguage.regexp.structure.SeqRegexp" flags="ng" index="1OJ37Q" />
+      <concept id="1174485167097" name="jetbrains.mps.baseLanguage.regexp.structure.BinaryRegexp" flags="ng" index="1OLmFC">
+        <child id="1174485176897" name="left" index="1OLpdg" />
+        <child id="1174485181039" name="right" index="1OLqdY" />
+      </concept>
       <concept id="1174485235885" name="jetbrains.mps.baseLanguage.regexp.structure.UnaryRegexp" flags="ng" index="1OLBAW">
         <child id="1174485243418" name="regexp" index="1OLDsb" />
       </concept>
@@ -56,6 +215,9 @@
         <child id="1174557628217" name="part" index="1T5LoC" />
       </concept>
       <concept id="1174554211468" name="jetbrains.mps.baseLanguage.regexp.structure.PositiveSymbolClassRegexp" flags="ng" index="1SSJmt" />
+      <concept id="1174555732504" name="jetbrains.mps.baseLanguage.regexp.structure.PredefinedSymbolClassRegexp" flags="ng" index="1SYyG9">
+        <reference id="1174555843709" name="symbolClass" index="1SYXPG" />
+      </concept>
       <concept id="1174557878319" name="jetbrains.mps.baseLanguage.regexp.structure.CharacterSymbolClassPart" flags="ng" index="1T6I$Y">
         <property id="1174557887320" name="character" index="1T6KD9" />
       </concept>
@@ -66,6 +228,13 @@
         <child id="1174653387388" name="regexp" index="1YN4dH" />
       </concept>
     </language>
+    <language id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections">
+      <concept id="1204796164442" name="jetbrains.mps.baseLanguage.collections.structure.InternalSequenceOperation" flags="nn" index="23sCx2">
+        <child id="1204796294226" name="closure" index="23t8la" />
+      </concept>
+      <concept id="1203518072036" name="jetbrains.mps.baseLanguage.collections.structure.SmartClosureParameterDeclaration" flags="ig" index="Rh6nW" />
+      <concept id="1202120902084" name="jetbrains.mps.baseLanguage.collections.structure.WhereOperation" flags="nn" index="3zZkjj" />
+    </language>
   </registry>
   <node concept="1M2fIO" id="3qvzBqWDzqQ">
     <property role="3GE5qa" value="node.value" />
@@ -100,5 +269,319 @@
       </node>
     </node>
   </node>
+  <node concept="1M2fIO" id="7E86$tKtku$">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1M2myG" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+    <node concept="EnEH3" id="7E86$tKtkwH" role="1MhHOB">
+      <ref role="EomxK" to="tpck:h0TrG11" resolve="name" />
+      <node concept="QB0g5" id="7E86$tKtkPB" role="QCWH9">
+        <node concept="3clFbS" id="7E86$tKtkPC" role="2VODD2">
+          <node concept="3clFbF" id="2E5lcNndo$l" role="3cqZAp">
+            <node concept="2nawOw" id="2E5lcNndpuB" role="3clFbG">
+              <node concept="1Qi9sc" id="2E5lcNndpuD" role="1YN4dH">
+                <node concept="1OJ37Q" id="2E5lcNndqgq" role="1QigWp">
+                  <node concept="1SYyG9" id="2E5lcNndq4L" role="1OLpdg">
+                    <ref role="1SYXPG" to="tpfp:h5SV1SY" resolve="\p{Alpha}" />
+                  </node>
+                  <node concept="1OCmVF" id="2E5lcNndqE8" role="1OLqdY">
+                    <node concept="1SSJmt" id="2E5lcNndqgp" role="1OLDsb">
+                      <node concept="1Tadzz" id="2E5lcNndqtL" role="1T5LoC">
+                        <ref role="1Takfv" to="tpfp:h5SVbIa" resolve="\p{Alnum}" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="1Wqviy" id="2E5lcNndo$k" role="2nb13w" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="EnEH3" id="7E86$tKtl8X" role="1MhHOB">
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+        </node>
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+                <ref role="37wK5l" to="e2lb:~UnsupportedOperationException.&lt;init&gt;()" resolve="UnsupportedOperationException" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="1M2fIO" id="7E86$tK_SDr">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1M2myG" to="5j4j:7E86$tK_OxQ" resolve="LogicalVariableReference" />
+    <node concept="1N5Pfh" id="7E86$tK_SGg" role="1Mr941">
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+            <node concept="3cpWsn" id="6Ng87FPZcv6" role="3cpWs9">
+              <property role="TrG5h" value="parentScope" />
+              <node concept="1ajhzC" id="6Ng87FPZcv7" role="1tU5fm">
+                <node concept="3Tqbb2" id="6Ng87FPZcv8" role="1ajw0F" />
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+                  <ref role="3uigEE" to="o8zo:3fifI_xCtN$" resolve="Scope" />
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+                <node concept="37vLTG" id="6Ng87FPZcve" role="1bW2Oz">
+                  <property role="TrG5h" value="container" />
+                  <node concept="3Tqbb2" id="6Ng87FPZcvf" role="1tU5fm" />
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+                <node concept="3clFbS" id="6Ng87FPZcvg" role="1bW5cS">
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+                        <node concept="3cpWsn" id="6Ng87FPZcvl" role="3cpWs9">
+                          <property role="TrG5h" value="childrenScope" />
+                          <node concept="3uibUv" id="6Ng87FPZcvm" role="1tU5fm">
+                            <ref role="3uigEE" to="o8zo:4IP40Bi3e_R" resolve="ListScope" />
+                          </node>
+                          <node concept="2ShNRf" id="6Ng87FPZcvn" role="33vP2m">
+                            <node concept="YeOm9" id="6Ng87FPZcvo" role="2ShVmc">
+                              <node concept="1Y3b0j" id="6Ng87FPZcvp" role="YeSDq">
+                                <property role="2bfB8j" value="true" />
+                                <ref role="37wK5l" to="o8zo:4IP40Bi3e_T" resolve="ListScope" />
+                                <ref role="1Y3XeK" to="o8zo:4IP40Bi3e_R" resolve="ListScope" />
+                                <node concept="2tJIrI" id="7E86$tKAluT" role="jymVt" />
+                                <node concept="2OqwBi" id="6Ng87FPZcvr" role="37wK5m">
+                                  <node concept="2OqwBi" id="6Ng87FPZcvs" role="2Oq$k0">
+                                    <node concept="37vLTw" id="6Ng87FPZcvt" role="2Oq$k0">
+                                      <ref role="3cqZAo" node="6Ng87FPZcve" resolve="container" />
+                                    </node>
+                                    <node concept="32TBzR" id="6Ng87FPZcvu" role="2OqNvi" />
+                                  </node>
+                                  <node concept="3zZkjj" id="6Ng87FPZcvv" role="2OqNvi">
+                                    <node concept="1bVj0M" id="6Ng87FPZcvw" role="23t8la">
+                                      <node concept="3clFbS" id="6Ng87FPZcvx" role="1bW5cS">
+                                        <node concept="3clFbF" id="6Ng87FPZcvy" role="3cqZAp">
+                                          <node concept="2OqwBi" id="6Ng87FPZcvz" role="3clFbG">
+                                            <node concept="37vLTw" id="6Ng87FPZcv$" role="2Oq$k0">
+                                              <ref role="3cqZAo" node="6Ng87FPZcvB" resolve="stm" />
+                                            </node>
+                                            <node concept="1mIQ4w" id="6Ng87FPZcv_" role="2OqNvi">
+                                              <node concept="chp4Y" id="7E86$tKA4OJ" role="cj9EA">
+                                                <ref role="cht4Q" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+                                              </node>
+                                            </node>
+                                          </node>
+                                        </node>
+                                      </node>
+                                      <node concept="Rh6nW" id="6Ng87FPZcvB" role="1bW2Oz">
+                                        <property role="TrG5h" value="stm" />
+                                        <node concept="2jxLKc" id="6Ng87FPZcvC" role="1tU5fm" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                                <node concept="3Tm1VV" id="6Ng87FPZcvN" role="1B3o_S" />
+                                <node concept="3clFb_" id="6Ng87FPZcvO" role="jymVt">
+                                  <property role="1EzhhJ" value="false" />
+                                  <property role="TrG5h" value="getName" />
+                                  <node concept="17QB3L" id="6Ng87FPZcvP" role="3clF45" />
+                                  <node concept="3Tm1VV" id="6Ng87FPZcvQ" role="1B3o_S" />
+                                  <node concept="37vLTG" id="6Ng87FPZcvR" role="3clF46">
+                                    <property role="TrG5h" value="child" />
+                                    <node concept="3Tqbb2" id="6Ng87FPZcvS" role="1tU5fm" />
+                                  </node>
+                                  <node concept="3clFbS" id="6Ng87FPZcvT" role="3clF47">
+                                    <node concept="3clFbF" id="6Ng87FPZcvU" role="3cqZAp">
+                                      <node concept="2OqwBi" id="6Ng87FPZcvV" role="3clFbG">
+                                        <node concept="1PxgMI" id="6Ng87FPZcvW" role="2Oq$k0">
+                                          <property role="1BlNFB" value="true" />
+                                          <ref role="1PxNhF" to="tpck:h0TrEE$" resolve="INamedConcept" />
+                                          <node concept="37vLTw" id="6Ng87FPZcvX" role="1PxMeX">
+                                            <ref role="3cqZAo" node="6Ng87FPZcvR" resolve="child" />
+                                          </node>
+                                        </node>
+                                        <node concept="3TrcHB" id="6Ng87FPZcvY" role="2OqNvi">
+                                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbH" id="7E86$tKAmrW" role="3cqZAp" />
+                      <node concept="3cpWs6" id="6Ng87FPZcw9" role="3cqZAp">
+                        <node concept="2YIFZM" id="6Ng87FPZcwa" role="3cqZAk">
+                          <ref role="1Pybhc" to="fnmy:3A2qfoxVUBF" resolve="Scopes" />
+                          <ref role="37wK5l" to="fnmy:3A2qfoxXWxA" resolve="defaultWithNameHiding" />
+                          <node concept="3TUQnm" id="6Ng87FPZcwb" role="37wK5m">
+                            <ref role="3TV0OU" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+                          </node>
+                          <node concept="37vLTw" id="6Ng87FPZcwc" role="37wK5m">
+                            <ref role="3cqZAo" node="6Ng87FPZcvl" resolve="childrenScope" />
+                          </node>
+                          <node concept="2Sg_IR" id="6Ng87FPZcwd" role="37wK5m">
+                            <node concept="37vLTw" id="6Ng87FPZcwe" role="2SgG2M">
+                              <ref role="3cqZAo" node="6Ng87FPZcv6" resolve="parentScope" />
+                            </node>
+                            <node concept="2OqwBi" id="7E86$tKAntd" role="2SgHGx">
+                              <node concept="37vLTw" id="7E86$tKAnte" role="2Oq$k0">
+                                <ref role="3cqZAo" node="6Ng87FPZcve" resolve="container" />
+                              </node>
+                              <node concept="2Xjw5R" id="7E86$tKAntf" role="2OqNvi">
+                                <node concept="3gmYPX" id="7E86$tKAntg" role="1xVPHs">
+                                  <node concept="3gn64h" id="7E86$tKAnth" role="3gmYPZ">
+                                    <ref role="3gnhBz" to="tpee:fzclF80" resolve="StatementList" />
+                                  </node>
+                                  <node concept="3gn64h" id="7E86$tKAnti" role="3gmYPZ">
+                                    <ref role="3gnhBz" to="5j4j:7E86$tK$Rgo" resolve="LogicalVariableScope" />
+                                  </node>
+                                  <node concept="3gn64h" id="7E86$tKAntj" role="3gmYPZ">
+                                    <ref role="3gnhBz" to="tpee:fzclF7W" resolve="BaseMethodDeclaration" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbH" id="6Ng87FPZcwg" role="3cqZAp" />
+                    </node>
+                    <node concept="2OqwBi" id="6Ng87FPZcwh" role="3clFbw">
+                      <node concept="37vLTw" id="6Ng87FPZcwi" role="2Oq$k0">
+                        <ref role="3cqZAo" node="6Ng87FPZcve" resolve="container" />
+                      </node>
+                      <node concept="1mIQ4w" id="6Ng87FPZcwj" role="2OqNvi">
+                        <node concept="chp4Y" id="6Ng87FPZcwk" role="cj9EA">
+                          <ref role="cht4Q" to="tpee:fzclF80" resolve="StatementList" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="3eNFk2" id="6Ng87FPZcwl" role="3eNLev">
+                      <node concept="3clFbS" id="6Ng87FPZcwm" role="3eOfB_">
+                        <node concept="3clFbH" id="6Ng87FPZcwn" role="3cqZAp" />
+                        <node concept="3cpWs6" id="7E86$tKACLG" role="3cqZAp">
+                          <node concept="2ShNRf" id="7E86$tKAEHa" role="3cqZAk">
+                            <node concept="YeOm9" id="7E86$tKAF_i" role="2ShVmc">
+                              <node concept="1Y3b0j" id="7E86$tKAF_l" role="YeSDq">
+                                <property role="2bfB8j" value="true" />
+                                <ref role="1Y3XeK" to="o8zo:4IP40Bi3e_R" resolve="ListScope" />
+                                <ref role="37wK5l" to="o8zo:4IP40Bi3e_T" resolve="ListScope" />
+                                <node concept="2OqwBi" id="7E86$tKBKrs" role="37wK5m">
+                                  <node concept="1PxgMI" id="7E86$tKBKrt" role="2Oq$k0">
+                                    <ref role="1PxNhF" to="5j4j:7E86$tK$Rgo" resolve="LogicalVariableScope" />
+                                    <node concept="37vLTw" id="7E86$tKBKru" role="1PxMeX">
+                                      <ref role="3cqZAo" node="6Ng87FPZcve" resolve="container" />
+                                    </node>
+                                  </node>
+                                  <node concept="2qgKlT" id="7E86$tKBKrv" role="2OqNvi">
+                                    <ref role="37wK5l" to="ha02:7E86$tKAujJ" resolve="exportedLogicalVariable" />
+                                  </node>
+                                </node>
+                                <node concept="3Tm1VV" id="7E86$tKAF_m" role="1B3o_S" />
+                                <node concept="2tJIrI" id="7E86$tKAH90" role="jymVt" />
+                                <node concept="3clFb_" id="7E86$tKAF_n" role="jymVt">
+                                  <property role="1EzhhJ" value="false" />
+                                  <property role="TrG5h" value="getName" />
+                                  <node concept="17QB3L" id="7E86$tKAF_o" role="3clF45" />
+                                  <node concept="3Tm1VV" id="7E86$tKAF_p" role="1B3o_S" />
+                                  <node concept="37vLTG" id="7E86$tKAF_r" role="3clF46">
+                                    <property role="TrG5h" value="child" />
+                                    <node concept="3Tqbb2" id="7E86$tKAF_s" role="1tU5fm" />
+                                  </node>
+                                  <node concept="3clFbS" id="7E86$tKAF_t" role="3clF47">
+                                    <node concept="3clFbF" id="7E86$tKAIlg" role="3cqZAp">
+                                      <node concept="2OqwBi" id="7E86$tKAIlh" role="3clFbG">
+                                        <node concept="1PxgMI" id="7E86$tKAIli" role="2Oq$k0">
+                                          <property role="1BlNFB" value="true" />
+                                          <ref role="1PxNhF" to="tpck:h0TrEE$" resolve="INamedConcept" />
+                                          <node concept="37vLTw" id="7E86$tKAIlj" role="1PxMeX">
+                                            <ref role="3cqZAo" node="7E86$tKAF_r" resolve="child" />
+                                          </node>
+                                        </node>
+                                        <node concept="3TrcHB" id="7E86$tKAIlk" role="2OqNvi">
+                                          <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="2OqwBi" id="6Ng87FPZcyw" role="3eO9$A">
+                        <node concept="37vLTw" id="6Ng87FPZcyx" role="2Oq$k0">
+                          <ref role="3cqZAo" node="6Ng87FPZcve" resolve="container" />
+                        </node>
+                        <node concept="1mIQ4w" id="6Ng87FPZcyy" role="2OqNvi">
+                          <node concept="chp4Y" id="7E86$tKAvH5" role="cj9EA">
+                            <ref role="cht4Q" to="5j4j:7E86$tK$Rgo" resolve="LogicalVariableScope" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbH" id="6Ng87FPZcy$" role="3cqZAp" />
+                  <node concept="3clFbF" id="6Ng87FPZcy_" role="3cqZAp">
+                    <node concept="10Nm6u" id="6Ng87FPZcyA" role="3clFbG" />
+                  </node>
+                </node>
+              </node>
+              <node concept="37vLTw" id="6Ng87FPZcyB" role="37vLTJ">
+                <ref role="3cqZAo" node="6Ng87FPZcv6" resolve="parentScope" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="6Ng87FPZcyC" role="3cqZAp" />
+          <node concept="3clFbF" id="6Ng87FPZcyD" role="3cqZAp">
+            <node concept="2Sg_IR" id="6Ng87FPZcyE" role="3clFbG">
+              <node concept="37vLTw" id="6Ng87FPZcyF" role="2SgG2M">
+                <ref role="3cqZAo" node="6Ng87FPZcv6" resolve="parentScope" />
+              </node>
+              <node concept="2OqwBi" id="6Ng87FPZcyG" role="2SgHGx">
+                <node concept="2rP1CM" id="6Ng87FPZcyH" role="2Oq$k0" />
+                <node concept="2Xjw5R" id="6Ng87FPZcyI" role="2OqNvi">
+                  <node concept="1xMEDy" id="6Ng87FPZcyJ" role="1xVPHs">
+                    <node concept="chp4Y" id="6Ng87FPZcyK" role="ri$Ld">
+                      <ref role="cht4Q" to="tpee:fzclF80" resolve="StatementList" />
+                    </node>
+                  </node>
+                  <node concept="1xIGOp" id="6Ng87FPZcyL" role="1xVPHs" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="7E86$tK_TI7" role="3cqZAp" />
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/editor.mps b/languages/jetbrains.mps.logic/languageModels/editor.mps
index 63107cf6..34a4fec3 100644
--- a/languages/jetbrains.mps.logic/languageModels/editor.mps
+++ b/languages/jetbrains.mps.logic/languageModels/editor.mps
@@ -16,6 +16,7 @@
     <import index="ejnv" ref="f:java_stub#1ed103c3-3aa6-49b7-9c21-6765ee11f224#jetbrains.mps.editor.runtime.style(MPS.Editor/jetbrains.mps.editor.runtime.style@java_stub)" />
     <import index="nu8v" ref="f:java_stub#1ed103c3-3aa6-49b7-9c21-6765ee11f224#jetbrains.mps.openapi.editor.cells(MPS.Editor/jetbrains.mps.openapi.editor.cells@java_stub)" />
     <import index="srng" ref="f:java_stub#1ed103c3-3aa6-49b7-9c21-6765ee11f224#jetbrains.mps.openapi.editor(MPS.Editor/jetbrains.mps.openapi.editor@java_stub)" />
+    <import index="tpco" ref="r:00000000-0000-4000-0000-011c89590284(jetbrains.mps.lang.core.editor)" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
     <import index="e2lb" ref="f:java_stub#6354ebe7-c22a-4a0f-ac54-50b52ab9b065#java.lang(JDK/java.lang@java_stub)" implicit="true" />
   </imports>
@@ -62,6 +63,7 @@
       <concept id="1078939183254" name="jetbrains.mps.lang.editor.structure.CellModel_Component" flags="sg" stub="3162947552742194261" index="PMmxH">
         <reference id="1078939183255" name="editorComponent" index="PMmxG" />
       </concept>
+      <concept id="1149850725784" name="jetbrains.mps.lang.editor.structure.CellModel_AttributedNodeCell" flags="ng" index="2SsqMj" />
       <concept id="1186402211651" name="jetbrains.mps.lang.editor.structure.StyleSheet" flags="ng" index="V5hpn">
         <child id="1186402402630" name="styleClass" index="V601i" />
       </concept>
@@ -94,6 +96,9 @@
         <child id="1139535280620" name="executeFunction" index="1hA7z_" />
       </concept>
       <concept id="1139535439104" name="jetbrains.mps.lang.editor.structure.CellActionMap_ExecuteFunction" flags="in" index="1hAIg9" />
+      <concept id="1088013125922" name="jetbrains.mps.lang.editor.structure.CellModel_RefCell" flags="sg" stub="730538219795941030" index="1iCGBv">
+        <child id="1088186146602" name="editorComponent" index="1sWHZn" />
+      </concept>
       <concept id="1225456267680" name="jetbrains.mps.lang.editor.structure.RGBColor" flags="ng" index="1iSF2X">
         <property id="1225456424731" name="value" index="1iTho6" />
       </concept>
@@ -101,13 +106,17 @@
         <reference id="1381004262292426837" name="parentStyleClass" index="1k5W1q" />
       </concept>
       <concept id="1223387125302" name="jetbrains.mps.lang.editor.structure.QueryFunction_Boolean" flags="in" index="3nzxsE" />
+      <concept id="1088185857835" name="jetbrains.mps.lang.editor.structure.InlineEditorComponent" flags="ig" index="1sVBvm" />
       <concept id="1219226236603" name="jetbrains.mps.lang.editor.structure.DrawBracketsStyleClassItem" flags="ln" index="3vyZuw" />
       <concept id="9122903797312246523" name="jetbrains.mps.lang.editor.structure.StyleReference" flags="ng" index="1wgc9g">
         <reference id="9122903797312247166" name="style" index="1wgcnl" />
       </concept>
       <concept id="1139848536355" name="jetbrains.mps.lang.editor.structure.CellModel_WithRole" flags="ng" index="1$h60E">
+        <property id="1140017977771" name="readOnly" index="1Intyy" />
         <reference id="1140103550593" name="relationDeclaration" index="1NtTu8" />
       </concept>
+      <concept id="7667708318090725848" name="jetbrains.mps.lang.editor.structure.IndentLayoutIndentAnchorStyleClassItem" flags="ln" index="1Bsynf" />
+      <concept id="7667708318090877006" name="jetbrains.mps.lang.editor.structure.IndentLayoutWrapAnchorStyleClassItem" flags="ln" index="1Bt7hp" />
       <concept id="1073389214265" name="jetbrains.mps.lang.editor.structure.EditorCellModel" flags="ng" index="3EYTF0">
         <reference id="1139959269582" name="actionMap" index="1ERwB7" />
         <child id="1142887637401" name="renderingCondition" index="pqm2j" />
@@ -251,6 +260,7 @@
       <concept id="1146171026731" name="jetbrains.mps.lang.smodel.structure.Property_HasValue_Enum" flags="nn" index="3t7uKx">
         <child id="1146171026732" name="value" index="3t7uKA" />
       </concept>
+      <concept id="1172008320231" name="jetbrains.mps.lang.smodel.structure.Node_IsNotNullOperation" flags="nn" index="3x8VRR" />
       <concept id="1180636770613" name="jetbrains.mps.lang.smodel.structure.SNodeCreator" flags="nn" index="3zrR0B">
         <child id="1180636770616" name="createdType" index="3zrR0E" />
       </concept>
@@ -266,6 +276,9 @@
       <concept id="1138056022639" name="jetbrains.mps.lang.smodel.structure.SPropertyAccess" flags="nn" index="3TrcHB">
         <reference id="1138056395725" name="property" index="3TsBF5" />
       </concept>
+      <concept id="1138056143562" name="jetbrains.mps.lang.smodel.structure.SLinkAccess" flags="nn" index="3TrEf2">
+        <reference id="1138056516764" name="link" index="3Tt5mk" />
+      </concept>
       <concept id="1138056282393" name="jetbrains.mps.lang.smodel.structure.SLinkListAccess" flags="nn" index="3Tsc0h">
         <reference id="1138056546658" name="link" index="3TtcxE" />
       </concept>
@@ -398,6 +411,12 @@
           <node concept="3F0ifn" id="1pt0VTMza2o" role="3EZMnx">
             <property role="3F0ifm" value="[" />
             <ref role="1k5W1q" to="tpen:hXb$RYA" resolve="LeftBracket" />
+            <node concept="30gYXW" id="1OShD0HUg9Y" role="3F10Kt">
+              <property role="Vb096" value="pink" />
+            </node>
+            <node concept="VechU" id="1OShD0HUgE8" role="3F10Kt">
+              <property role="Vb096" value="red" />
+            </node>
             <node concept="11L4FC" id="1pt0VTMzar_" role="3F10Kt">
               <property role="VOm3f" value="false" />
             </node>
@@ -448,6 +467,12 @@
           <node concept="3F0ifn" id="1pt0VTMw5UE" role="3EZMnx">
             <property role="3F0ifm" value="]" />
             <ref role="1k5W1q" to="tpen:hXb$V4T" resolve="RightBracket" />
+            <node concept="30gYXW" id="1OShD0HUgTX" role="3F10Kt">
+              <property role="Vb096" value="pink" />
+            </node>
+            <node concept="VechU" id="1OShD0HUgTY" role="3F10Kt">
+              <property role="Vb096" value="red" />
+            </node>
             <node concept="11L4FC" id="1pt0VTMzax5" role="3F10Kt">
               <property role="VOm3f" value="true" />
             </node>
@@ -525,6 +550,9 @@
         <ref role="1NtTu8" to="5j4j:6$jH9oLmYL8" />
         <ref role="1ERwB7" node="38jpnomVCZ5" resolve="ValueRole_INSERT" />
         <node concept="l2Vlx" id="1pt0VTMw7$e" role="2czzBx" />
+        <node concept="3F0ifn" id="dfChU1DR3X" role="2czzBI">
+          <property role="3F0ifm" value="" />
+        </node>
       </node>
       <node concept="3F0ifn" id="1pt0VTMw7ue" role="3EZMnx">
         <property role="3F0ifm" value="&quot;" />
@@ -1665,12 +1693,6 @@
                           <node concept="36be1Y" id="38jpnomX7Sd" role="2pJxcZ">
                             <node concept="2pJPED" id="38jpnomX7Ty" role="36be1Z">
                               <ref role="2pJxaS" to="5j4j:6$jH9oLmYJ_" resolve="ValueHolder" />
-                              <node concept="2pIpSj" id="5iubxWjiLbD" role="2pJxcM">
-                                <ref role="2pIpSl" to="5j4j:5lJXKB2m4" />
-                                <node concept="2pJPED" id="5iubxWjiLcT" role="2pJxcZ">
-                                  <ref role="2pJxaS" to="5j4j:6$jH9oLnyB1" resolve="Symbol" />
-                                </node>
-                              </node>
                             </node>
                           </node>
                         </node>
@@ -1774,12 +1796,6 @@
                           <node concept="36be1Y" id="3qvzBqW$Fv_" role="2pJxcZ">
                             <node concept="2pJPED" id="3qvzBqW$FvA" role="36be1Z">
                               <ref role="2pJxaS" to="5j4j:6$jH9oLmYJ_" resolve="ValueHolder" />
-                              <node concept="2pIpSj" id="5iubxWjiGuQ" role="2pJxcM">
-                                <ref role="2pIpSl" to="5j4j:5lJXKB2m4" />
-                                <node concept="2pJPED" id="5iubxWjiKEz" role="2pJxcZ">
-                                  <ref role="2pJxaS" to="5j4j:6$jH9oLnyB1" resolve="Symbol" />
-                                </node>
-                              </node>
                             </node>
                           </node>
                         </node>
@@ -2135,5 +2151,339 @@
       <node concept="l2Vlx" id="2q_78a9c7Q_" role="2iSdaV" />
     </node>
   </node>
+  <node concept="24kQdi" id="7E86$tKsqua">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1XX52x" to="5j4j:7E86$tKskWj" resolve="LogicalValue" />
+    <node concept="3EZMnI" id="6p0DfM0hL7k" role="2wV5jI">
+      <node concept="3EZMnI" id="6p0DfM0hLg3" role="3EZMnx">
+        <node concept="VPM3Z" id="6p0DfM0hLg4" role="3F10Kt">
+          <property role="VOm3f" value="false" />
+        </node>
+        <node concept="3vyZuw" id="6p0DfM0hLg7" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="VLuvy" id="6p0DfM0hLg8" role="3F10Kt">
+          <node concept="1iSF2X" id="6p0DfM0hLg9" role="VblUZ">
+            <property role="1iTho6" value="9999FF" />
+          </node>
+        </node>
+        <node concept="1Bsynf" id="6p0DfM0hLga" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="1Bt7hp" id="6p0DfM0hLgb" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="3F0ifn" id="6p0DfM0hLgc" role="3EZMnx">
+          <node concept="VPM3Z" id="6p0DfM0oSne" role="3F10Kt">
+            <property role="VOm3f" value="false" />
+          </node>
+        </node>
+        <node concept="3F1sOY" id="6p0DfM0hLgd" role="3EZMnx">
+          <ref role="1NtTu8" to="5j4j:7E86$tKsqnr" />
+        </node>
+        <node concept="3F0ifn" id="6p0DfM0hLge" role="3EZMnx">
+          <node concept="VPM3Z" id="6p0DfM0oSd3" role="3F10Kt">
+            <property role="VOm3f" value="false" />
+          </node>
+        </node>
+        <node concept="l2Vlx" id="6p0DfM0hLgf" role="2iSdaV" />
+      </node>
+      <node concept="l2Vlx" id="6p0DfM0hL7n" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="7E86$tKt5HF">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1XX52x" to="5j4j:7E86$tKt5sV" resolve="ExpressionLogicalVariable" />
+    <node concept="3EZMnI" id="7E86$tKt68D" role="2wV5jI">
+      <node concept="3F0ifn" id="6Ng87FPWMwT" role="3EZMnx">
+        <property role="3F0ifm" value="$" />
+        <ref role="1k5W1q" to="tpen:hgVS8CF" resolve="KeyWord" />
+        <node concept="11LMrY" id="6Ng87FPWMAV" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+      </node>
+      <node concept="3F1sOY" id="7E86$tKt6my" role="3EZMnx">
+        <ref role="1NtTu8" to="5j4j:7E86$tKt5BI" />
+      </node>
+      <node concept="l2Vlx" id="7E86$tKt68G" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="7E86$tKtiJM">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1XX52x" to="5j4j:7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+    <node concept="3EZMnI" id="2E5lcNn2Yfo" role="2wV5jI">
+      <node concept="l2Vlx" id="2E5lcNn2Yfr" role="2iSdaV" />
+      <node concept="3F0A7n" id="2E5lcNn2YOJ" role="3EZMnx">
+        <ref role="1NtTu8" to="tpck:h0TrG11" resolve="name" />
+      </node>
+      <node concept="3EZMnI" id="2E5lcNndMdC" role="3EZMnx">
+        <node concept="VPM3Z" id="2E5lcNndMdD" role="3F10Kt">
+          <property role="VOm3f" value="false" />
+        </node>
+        <node concept="l2Vlx" id="2E5lcNndMdE" role="2iSdaV" />
+        <node concept="3F0ifn" id="2E5lcNndMdF" role="3EZMnx">
+          <property role="3F0ifm" value=":" />
+          <ref role="1k5W1q" to="tpen:hFD0yD_" resolve="VariableName" />
+          <node concept="11L4FC" id="2E5lcNndMdG" role="3F10Kt">
+            <property role="VOm3f" value="true" />
+          </node>
+          <node concept="11LMrY" id="2E5lcNndMdH" role="3F10Kt">
+            <property role="VOm3f" value="true" />
+          </node>
+        </node>
+        <node concept="3F1sOY" id="2E5lcNndMdI" role="3EZMnx">
+          <ref role="1NtTu8" to="5j4j:7E86$tKtioV" />
+        </node>
+        <node concept="pkWqt" id="2E5lcNndN30" role="pqm2j">
+          <node concept="3clFbS" id="2E5lcNndN31" role="2VODD2">
+            <node concept="3clFbF" id="2E5lcNndNe5" role="3cqZAp">
+              <node concept="2OqwBi" id="2E5lcNndNUm" role="3clFbG">
+                <node concept="2OqwBi" id="2E5lcNndNiC" role="2Oq$k0">
+                  <node concept="pncrf" id="2E5lcNndNe4" role="2Oq$k0" />
+                  <node concept="3TrEf2" id="7E86$tKtjDd" role="2OqNvi">
+                    <ref role="3Tt5mk" to="5j4j:7E86$tKtioV" />
+                  </node>
+                </node>
+                <node concept="3x8VRR" id="2E5lcNndOan" role="2OqNvi" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="24kQdi" id="7E86$tK_Puj">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1XX52x" to="5j4j:7E86$tK_OxQ" resolve="LogicalVariableReference" />
+    <node concept="3EZMnI" id="6p0DfM0eyCR" role="2wV5jI">
+      <node concept="1iCGBv" id="2E5lcNn53QK" role="3EZMnx">
+        <ref role="1NtTu8" to="5j4j:7E86$tK_PaH" />
+        <node concept="1sVBvm" id="2E5lcNn53QM" role="1sWHZn">
+          <node concept="3F0A7n" id="2E5lcNn54qR" role="2wV5jI">
+            <property role="1Intyy" value="true" />
+            <ref role="1NtTu8" to="tpck:h0TrG11" resolve="name" />
+          </node>
+        </node>
+      </node>
+      <node concept="3EZMnI" id="6p0DfM0nJrG" role="3EZMnx">
+        <node concept="VPM3Z" id="6p0DfM0nJrI" role="3F10Kt">
+          <property role="VOm3f" value="false" />
+        </node>
+        <node concept="3F0ifn" id="6p0DfM0nL2R" role="3EZMnx">
+          <property role="3F0ifm" value="_" />
+          <ref role="1k5W1q" to="tpen:hFD0yD_" resolve="VariableName" />
+          <node concept="11L4FC" id="6p0DfM0nLwd" role="3F10Kt">
+            <property role="VOm3f" value="true" />
+          </node>
+          <node concept="11LMrY" id="6p0DfM0nLyK" role="3F10Kt">
+            <property role="VOm3f" value="true" />
+          </node>
+        </node>
+        <node concept="3F1sOY" id="6p0DfM0nLOu" role="3EZMnx">
+          <ref role="1NtTu8" to="5j4j:7E86$tKsJfa" />
+        </node>
+        <node concept="l2Vlx" id="6p0DfM0nJrL" role="2iSdaV" />
+        <node concept="pkWqt" id="6p0DfM0nJuq" role="pqm2j">
+          <node concept="3clFbS" id="6p0DfM0nJur" role="2VODD2">
+            <node concept="3clFbF" id="6p0DfM0nJDv" role="3cqZAp">
+              <node concept="2OqwBi" id="6p0DfM0nK$g" role="3clFbG">
+                <node concept="2OqwBi" id="6p0DfM0nJIt" role="2Oq$k0">
+                  <node concept="pncrf" id="6p0DfM0nJDu" role="2Oq$k0" />
+                  <node concept="3TrEf2" id="7E86$tK_Qy4" role="2OqNvi">
+                    <ref role="3Tt5mk" to="5j4j:7E86$tKsJfa" />
+                  </node>
+                </node>
+                <node concept="3x8VRR" id="6p0DfM0nKNr" role="2OqNvi" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="l2Vlx" id="6p0DfM0eyCU" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="1mP5b6jNJde">
+    <property role="3GE5qa" value="logical" />
+    <ref role="1XX52x" to="5j4j:1mP5b6jNC0S" resolve="LogicalType" />
+    <node concept="3EZMnI" id="6Ng87FPVAz_" role="2wV5jI">
+      <node concept="PMmxH" id="6Ng87FPVA_o" role="3EZMnx">
+        <ref role="PMmxG" to="tpco:2wZex4PafBj" resolve="alias" />
+        <ref role="1k5W1q" to="tpen:hgVS8CF" resolve="KeyWord" />
+      </node>
+      <node concept="l2Vlx" id="6Ng87FPVAzC" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="dfChU1yT1c">
+    <property role="3GE5qa" value="role" />
+    <ref role="1XX52x" to="5j4j:dfChU1ySVl" resolve="ExpressionRole" />
+    <node concept="3EZMnI" id="dfChU1yTlH" role="2wV5jI">
+      <node concept="3F0ifn" id="dfChU1yTlI" role="3EZMnx">
+        <property role="3F0ifm" value="`" />
+        <ref role="1k5W1q" to="tpen:75A9veqzBnk" resolve="AnyBracket" />
+        <node concept="11LMrY" id="dfChU1yTlJ" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="3Xmtl4" id="dfChU1yTlK" role="3F10Kt">
+          <node concept="1wgc9g" id="dfChU1yTlL" role="3XvnJa">
+            <ref role="1wgcnl" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+          </node>
+        </node>
+      </node>
+      <node concept="3F1sOY" id="dfChU1yTlM" role="3EZMnx">
+        <ref role="1k5W1q" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+        <ref role="1NtTu8" to="5j4j:dfChU1yT6L" />
+      </node>
+      <node concept="3F0ifn" id="dfChU1yTlN" role="3EZMnx">
+        <property role="3F0ifm" value="`" />
+        <ref role="1k5W1q" to="tpen:75A9veqzBnk" resolve="AnyBracket" />
+        <node concept="11L4FC" id="dfChU1yTlO" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="3Xmtl4" id="dfChU1yTlP" role="3F10Kt">
+          <node concept="1wgc9g" id="dfChU1yTlQ" role="3XvnJa">
+            <ref role="1wgcnl" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+          </node>
+        </node>
+      </node>
+      <node concept="l2Vlx" id="dfChU1yTlR" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="24kQdi" id="dfChU1zo92">
+    <ref role="1XX52x" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+    <node concept="3EZMnI" id="dfChU1zop0" role="2wV5jI">
+      <node concept="3F0ifn" id="dfChU1zop1" role="3EZMnx">
+        <property role="3F0ifm" value="`" />
+        <ref role="1k5W1q" to="tpen:75A9veqzBnk" resolve="AnyBracket" />
+        <node concept="11LMrY" id="dfChU1zop2" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="3Xmtl4" id="dfChU1zop3" role="3F10Kt">
+          <node concept="1wgc9g" id="dfChU1zop4" role="3XvnJa">
+            <ref role="1wgcnl" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+          </node>
+        </node>
+      </node>
+      <node concept="3F1sOY" id="dfChU1zop5" role="3EZMnx">
+        <ref role="1k5W1q" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+        <ref role="1NtTu8" to="5j4j:dfChU1zo4I" />
+      </node>
+      <node concept="3F0ifn" id="dfChU1zop6" role="3EZMnx">
+        <property role="3F0ifm" value="`" />
+        <ref role="1k5W1q" to="tpen:75A9veqzBnk" resolve="AnyBracket" />
+        <ref role="1ERwB7" node="dfChU1_gaJ" resolve="NodeSubstitution_DELETE" />
+        <node concept="11L4FC" id="dfChU1zop7" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="3Xmtl4" id="dfChU1zop8" role="3F10Kt">
+          <node concept="1wgc9g" id="dfChU1zop9" role="3XvnJa">
+            <ref role="1wgcnl" node="5lJXKGbEg" resolve="NodeVariableExpression" />
+          </node>
+        </node>
+      </node>
+      <node concept="3EZMnI" id="1OShD0HxxT1" role="3EZMnx">
+        <node concept="VPM3Z" id="1OShD0HxxT3" role="3F10Kt">
+          <property role="VOm3f" value="false" />
+        </node>
+        <node concept="3vyZuw" id="1OShD0HxE17" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="VLuvy" id="1OShD0HzMyo" role="3F10Kt">
+          <property role="Vb096" value="gray" />
+        </node>
+        <node concept="Veino" id="1OShD0HxE2W" role="3F10Kt">
+          <property role="Vb096" value="lightGray" />
+        </node>
+        <node concept="2SsqMj" id="dfChU1$j5q" role="3EZMnx">
+          <ref role="1k5W1q" to="tpen:1zA_DOMARqB" resolve="BlockComment" />
+        </node>
+        <node concept="l2Vlx" id="1OShD0HxxT6" role="2iSdaV" />
+      </node>
+      <node concept="l2Vlx" id="dfChU1zopa" role="2iSdaV" />
+    </node>
+  </node>
+  <node concept="1h_SRR" id="dfChU1_gaJ">
+    <property role="TrG5h" value="NodeSubstitution_DELETE" />
+    <ref role="1h_SK9" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+    <node concept="1hA7zw" id="dfChU1_gaK" role="1h_SK8">
+      <property role="1hAc7j" value="delete_action_id" />
+      <node concept="1hAIg9" id="dfChU1_gaL" role="1hA7z_">
+        <node concept="3clFbS" id="dfChU1_gaM" role="2VODD2">
+          <node concept="3clFbF" id="dfChU1_gf2" role="3cqZAp">
+            <node concept="2OqwBi" id="dfChU1_ggR" role="3clFbG">
+              <node concept="0IXxy" id="dfChU1_gf1" role="2Oq$k0" />
+              <node concept="1PgB_6" id="dfChU1_gta" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+  <node concept="24kQdi" id="1OShD0HAZ4h">
+    <property role="3GE5qa" value="node" />
+    <ref role="1XX52x" to="5j4j:1OShD0HAY6y" resolve="ListNode" />
+    <node concept="3EZMnI" id="1OShD0HAZmx" role="2wV5jI">
+      <node concept="VPM3Z" id="1OShD0HAZmy" role="3F10Kt">
+        <property role="VOm3f" value="false" />
+      </node>
+      <node concept="l2Vlx" id="1OShD0HAZmz" role="2iSdaV" />
+      <node concept="3F0ifn" id="1OShD0HAZm$" role="3EZMnx">
+        <property role="3F0ifm" value="[" />
+        <ref role="1k5W1q" to="tpen:hXb$RYA" resolve="LeftBracket" />
+        <node concept="11L4FC" id="1OShD0HAZm_" role="3F10Kt">
+          <property role="VOm3f" value="false" />
+        </node>
+        <node concept="11LMrY" id="1OShD0HAZmA" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="ljvvj" id="1OShD0HAZmB" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+          <node concept="3nzxsE" id="1OShD0HAZmC" role="3n$kyP">
+            <node concept="3clFbS" id="1OShD0HAZmD" role="2VODD2">
+              <node concept="3clFbF" id="1OShD0HAZmE" role="3cqZAp">
+                <node concept="3eOSWO" id="1OShD0HAZmF" role="3clFbG">
+                  <node concept="3cmrfG" id="1OShD0HAZmG" role="3uHU7w">
+                    <property role="3cmrfH" value="1" />
+                  </node>
+                  <node concept="2OqwBi" id="1OShD0HAZmH" role="3uHU7B">
+                    <node concept="2OqwBi" id="1OShD0HAZmI" role="2Oq$k0">
+                      <node concept="pncrf" id="1OShD0HAZmJ" role="2Oq$k0" />
+                      <node concept="3Tsc0h" id="1OShD0HB0L4" role="2OqNvi">
+                        <ref role="3TtcxE" to="5j4j:1OShD0HAZ38" />
+                      </node>
+                    </node>
+                    <node concept="34oBXx" id="1OShD0HAZmL" role="2OqNvi" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3F2HdR" id="1OShD0HAZmM" role="3EZMnx">
+        <property role="2czwfO" value="," />
+        <ref role="1NtTu8" to="5j4j:1OShD0HAZ38" />
+        <node concept="l2Vlx" id="1OShD0HAZmN" role="2czzBx" />
+        <node concept="lj46D" id="1OShD0HAZmO" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+        <node concept="tppnM" id="1OShD0HAZmP" role="sWeuL">
+          <node concept="ljvvj" id="1OShD0HAZmQ" role="3F10Kt">
+            <property role="VOm3f" value="true" />
+          </node>
+        </node>
+        <node concept="3F0ifn" id="1OShD0HAZmR" role="2czzBI">
+          <property role="3F0ifm" value="" />
+          <property role="ilYzB" value="empty" />
+        </node>
+      </node>
+      <node concept="3F0ifn" id="1OShD0HAZmS" role="3EZMnx">
+        <property role="3F0ifm" value="]" />
+        <ref role="1k5W1q" to="tpen:hXb$V4T" resolve="RightBracket" />
+        <node concept="11L4FC" id="1OShD0HAZmT" role="3F10Kt">
+          <property role="VOm3f" value="true" />
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/intentions.mps b/languages/jetbrains.mps.logic/languageModels/intentions.mps
index 7a48d0b6..e4e8ceda 100644
--- a/languages/jetbrains.mps.logic/languageModels/intentions.mps
+++ b/languages/jetbrains.mps.logic/languageModels/intentions.mps
@@ -68,11 +68,16 @@
       </concept>
     </language>
     <language id="d7a92d38-f7db-40d0-8431-763b0c3c9f20" name="jetbrains.mps.lang.intentions">
+      <concept id="1192794744107" name="jetbrains.mps.lang.intentions.structure.IntentionDeclaration" flags="ig" index="2S6QgY" />
+      <concept id="1192794782375" name="jetbrains.mps.lang.intentions.structure.DescriptionBlock" flags="in" index="2S6ZIM" />
+      <concept id="1192795771125" name="jetbrains.mps.lang.intentions.structure.IsApplicableBlock" flags="in" index="2SaL7w" />
+      <concept id="1192795911897" name="jetbrains.mps.lang.intentions.structure.ExecuteBlock" flags="in" index="2Sbjvc" />
       <concept id="1192796902958" name="jetbrains.mps.lang.intentions.structure.ConceptFunctionParameter_node" flags="nn" index="2Sf5sV" />
       <concept id="2522969319638091381" name="jetbrains.mps.lang.intentions.structure.BaseIntentionDeclaration" flags="ig" index="2ZfUlf">
         <property id="2522969319638091386" name="isAvailableInChildNodes" index="2ZfUl0" />
         <reference id="2522969319638198290" name="forConcept" index="2ZfgGC" />
         <child id="2522969319638198291" name="executeFunction" index="2ZfgGD" />
+        <child id="2522969319638093995" name="isApplicableFunction" index="2ZfVeh" />
         <child id="2522969319638093993" name="descriptionFunction" index="2ZfVej" />
       </concept>
       <concept id="1240316299033" name="jetbrains.mps.lang.intentions.structure.QueryBlock" flags="in" index="38BcoT">
@@ -89,7 +94,17 @@
       <concept id="1138661924179" name="jetbrains.mps.lang.smodel.structure.Property_SetOperation" flags="nn" index="tyxLq">
         <child id="1138662048170" name="value" index="tz02z" />
       </concept>
+      <concept id="1138757581985" name="jetbrains.mps.lang.smodel.structure.Link_SetNewChildOperation" flags="nn" index="zfrQC">
+        <reference id="1139880128956" name="concept" index="1A9B2P" />
+      </concept>
       <concept id="1145383075378" name="jetbrains.mps.lang.smodel.structure.SNodeListType" flags="in" index="2I9FWS" />
+      <concept id="1171999116870" name="jetbrains.mps.lang.smodel.structure.Node_IsNullOperation" flags="nn" index="3w_OXm" />
+      <concept id="6407023681583036853" name="jetbrains.mps.lang.smodel.structure.NodeAttributeQualifier" flags="ng" index="3CFYIy">
+        <reference id="6407023681583036854" name="attributeConcept" index="3CFYIx" />
+      </concept>
+      <concept id="6407023681583031218" name="jetbrains.mps.lang.smodel.structure.AttributeAccess" flags="nn" index="3CFZ6_">
+        <child id="6407023681583036852" name="qualifier" index="3CFYIz" />
+      </concept>
       <concept id="1240930118027" name="jetbrains.mps.lang.smodel.structure.SEnumOperationInvocation" flags="nn" index="3HcIyF">
         <reference id="1240930118028" name="enumDeclaration" index="3HcIyG" />
         <child id="1240930317927" name="operation" index="3Hdvt7" />
@@ -216,5 +231,54 @@
       <node concept="3Tqbb2" id="5A$IBX$dMZy" role="3ddBve" />
     </node>
   </node>
+  <node concept="2S6QgY" id="dfChU1zYxv">
+    <property role="TrG5h" value="add_substitution" />
+    <ref role="2ZfgGC" to="5j4j:5lJXKARS0" resolve="AbstractNode" />
+    <node concept="2Sbjvc" id="dfChU1zYxw" role="2ZfgGD">
+      <node concept="3clFbS" id="dfChU1zYxx" role="2VODD2">
+        <node concept="3clFbF" id="dfChU1$1h1" role="3cqZAp">
+          <node concept="2OqwBi" id="dfChU1$1xb" role="3clFbG">
+            <node concept="2OqwBi" id="dfChU1$1ie" role="2Oq$k0">
+              <node concept="2Sf5sV" id="dfChU1$1h0" role="2Oq$k0" />
+              <node concept="3CFZ6_" id="dfChU1$1q8" role="2OqNvi">
+                <node concept="3CFYIy" id="dfChU1$1sk" role="3CFYIz">
+                  <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                </node>
+              </node>
+            </node>
+            <node concept="zfrQC" id="dfChU1$1Tr" role="2OqNvi">
+              <ref role="1A9B2P" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2S6ZIM" id="dfChU1zYxy" role="2ZfVej">
+      <node concept="3clFbS" id="dfChU1zYxz" role="2VODD2">
+        <node concept="3clFbF" id="dfChU1zZ7B" role="3cqZAp">
+          <node concept="Xl_RD" id="dfChU1zZ7A" role="3clFbG">
+            <property role="Xl_RC" value="Substitute node" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2SaL7w" id="dfChU1zZHR" role="2ZfVeh">
+      <node concept="3clFbS" id="dfChU1zZHS" role="2VODD2">
+        <node concept="3clFbF" id="dfChU1zZXc" role="3cqZAp">
+          <node concept="2OqwBi" id="dfChU1$0CR" role="3clFbG">
+            <node concept="2OqwBi" id="dfChU1$01n" role="2Oq$k0">
+              <node concept="2Sf5sV" id="dfChU1zZXb" role="2Oq$k0" />
+              <node concept="3CFZ6_" id="dfChU1$0jk" role="2OqNvi">
+                <node concept="3CFYIy" id="dfChU1$0w0" role="3CFYIz">
+                  <ref role="3CFYIx" to="5j4j:dfChU1zo4B" resolve="NodeSubstitution" />
+                </node>
+              </node>
+            </node>
+            <node concept="3w_OXm" id="dfChU1$13Z" role="2OqNvi" />
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/structure.mps b/languages/jetbrains.mps.logic/languageModels/structure.mps
index 5ca46cb5..99d58f72 100644
--- a/languages/jetbrains.mps.logic/languageModels/structure.mps
+++ b/languages/jetbrains.mps.logic/languageModels/structure.mps
@@ -12,6 +12,12 @@
   <registry>
     <language id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure">
       <concept id="1224240836180" name="jetbrains.mps.lang.structure.structure.DeprecatedNodeAnnotation" flags="ig" index="asaX9" />
+      <concept id="6054523464626862044" name="jetbrains.mps.lang.structure.structure.AttributeInfo_IsMultiple" flags="ng" index="tn0Fv">
+        <property id="6054523464626875854" name="value" index="tnX3d" />
+      </concept>
+      <concept id="6054523464627964745" name="jetbrains.mps.lang.structure.structure.AttributeInfo_AttributedConcept" flags="ng" index="trNpa">
+        <reference id="6054523464627965081" name="concept" index="trN6q" />
+      </concept>
       <concept id="1082978164219" name="jetbrains.mps.lang.structure.structure.EnumerationDataTypeDeclaration" flags="ng" index="AxPO7">
         <property id="1197591154882" name="memberIdentifierPolicy" index="3lZH7k" />
         <reference id="1083171729157" name="memberDataType" index="M4eZT" />
@@ -21,6 +27,11 @@
         <property id="1083923523172" name="externalValue" index="1uS6qo" />
         <property id="1083923523171" name="internalValue" index="1uS6qv" />
       </concept>
+      <concept id="2992811758677295509" name="jetbrains.mps.lang.structure.structure.AttributeInfo" flags="ng" index="M6xJ_">
+        <property id="7588428831955550663" name="role" index="Hh88m" />
+        <child id="7588428831947959310" name="attributed" index="EQaZv" />
+        <child id="7588428831955550186" name="multiple" index="HhnKV" />
+      </concept>
       <concept id="1169125787135" name="jetbrains.mps.lang.structure.structure.AbstractConceptDeclaration" flags="ig" index="PkWjJ">
         <property id="4628067390765956807" name="final" index="R5$K2" />
         <property id="4628067390765956802" name="abstract" index="R5$K7" />
@@ -28,6 +39,7 @@
         <child id="1071489727083" name="linkDeclaration" index="1TKVEi" />
         <child id="1071489727084" name="propertyDeclaration" index="1TKVEl" />
       </concept>
+      <concept id="1169125989551" name="jetbrains.mps.lang.structure.structure.InterfaceConceptDeclaration" flags="ig" index="PlHQZ" />
       <concept id="1169127622168" name="jetbrains.mps.lang.structure.structure.InterfaceConceptReference" flags="ig" index="PrWs8">
         <reference id="1169127628841" name="intfc" index="PrY4T" />
       </concept>
@@ -85,7 +97,7 @@
     <property role="R5$K7" value="true" />
     <property role="R5$K2" value="false" />
     <property role="3GE5qa" value="role" />
-    <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
+    <ref role="1TJDcQ" node="5lJXKARS0" resolve="AbstractNode" />
     <node concept="1TJgyi" id="6$jH9oLmYHk" role="1TKVEl">
       <property role="TrG5h" value="cardinality" />
       <ref role="AX2Wp" node="6$jH9oLmYG0" resolve="Cardinality" />
@@ -224,12 +236,6 @@
     <property role="R5$K2" value="false" />
     <property role="3GE5qa" value="node" />
     <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
-    <node concept="1TJgyj" id="5lJXKB2m4" role="1TKVEi">
-      <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="symbol" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="6$jH9oLnyB1" resolve="Symbol" />
-    </node>
   </node>
   <node concept="1TIwiD" id="3JgCwkq$VNb">
     <property role="TrG5h" value="ExpressionNode" />
@@ -259,5 +265,125 @@
     <property role="34LRSv" value="_" />
     <ref role="1TJDcQ" node="6SkxsM$4k7r" resolve="AbstractVariable" />
   </node>
+  <node concept="1TIwiD" id="7E86$tKskWj">
+    <property role="TrG5h" value="LogicalValue" />
+    <property role="3GE5qa" value="logical" />
+    <ref role="1TJDcQ" node="7E86$tKsl45" resolve="LogicalExpression" />
+    <node concept="1TJgyj" id="7E86$tKsqnr" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="code" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="7E86$tKsl45">
+    <property role="TrG5h" value="LogicalExpression" />
+    <property role="R5$K7" value="true" />
+    <property role="R5$K2" value="false" />
+    <property role="3GE5qa" value="logical" />
+    <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
+  </node>
+  <node concept="1TIwiD" id="7E86$tKsHeX">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="AbstractLogicalVariable" />
+    <property role="R5$K7" value="true" />
+    <property role="R5$K2" value="false" />
+    <ref role="1TJDcQ" node="7E86$tKsl45" resolve="LogicalExpression" />
+    <node concept="1TJgyj" id="7E86$tKsJfa" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="index" />
+      <ref role="20lvS9" node="7E86$tKskWj" resolve="LogicalValue" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="7E86$tKt5sV">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="ExpressionLogicalVariable" />
+    <ref role="1TJDcQ" node="7E86$tKsHeX" resolve="AbstractLogicalVariable" />
+    <node concept="1TJgyj" id="7E86$tKt5BI" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="expression" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="7E86$tKtfM3">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalVariableDeclaration" />
+    <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
+    <node concept="1TJgyj" id="7E86$tKtioV" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="cardinality" />
+      <ref role="20lvS9" node="7E86$tKskWj" resolve="LogicalValue" />
+    </node>
+    <node concept="1TJgyi" id="7E86$tKtijQ" role="1TKVEl">
+      <property role="TrG5h" value="isMulti" />
+      <ref role="AX2Wp" to="tpck:fKAQMTB" resolve="boolean" />
+    </node>
+    <node concept="PrWs8" id="7E86$tKtid6" role="PzmwI">
+      <ref role="PrY4T" to="tpck:h0TrEE$" resolve="INamedConcept" />
+    </node>
+  </node>
+  <node concept="PlHQZ" id="7E86$tK$Rgo">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalVariableScope" />
+  </node>
+  <node concept="1TIwiD" id="7E86$tK_OxQ">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalVariableReference" />
+    <ref role="1TJDcQ" node="7E86$tKsHeX" resolve="AbstractLogicalVariable" />
+    <node concept="1TJgyj" id="7E86$tK_PaH" role="1TKVEi">
+      <property role="20lmBu" value="reference" />
+      <property role="20kJfa" value="declaration" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="7E86$tKtfM3" resolve="LogicalVariableDeclaration" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="1mP5b6jNC0S">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="LogicalType" />
+    <property role="34LRSv" value="logical" />
+    <ref role="1TJDcQ" to="tpee:fz3vP1H" resolve="Type" />
+  </node>
+  <node concept="1TIwiD" id="dfChU1ySVl">
+    <property role="3GE5qa" value="role" />
+    <property role="TrG5h" value="ExpressionRole" />
+    <ref role="1TJDcQ" node="6$jH9oLmYD_" resolve="Role" />
+    <node concept="1TJgyj" id="dfChU1yT6L" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="expression" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="dfChU1zo4B">
+    <property role="TrG5h" value="NodeSubstitution" />
+    <ref role="1TJDcQ" to="tpck:2ULFgo8_XDk" resolve="NodeAttribute" />
+    <node concept="1TJgyj" id="dfChU1zo4I" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="expression" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" to="tpee:fz3vP1J" resolve="Expression" />
+    </node>
+    <node concept="M6xJ_" id="dfChU1zo4C" role="lGtFl">
+      <property role="Hh88m" value="substitute" />
+      <node concept="trNpa" id="dfChU1zo4E" role="EQaZv">
+        <ref role="trN6q" node="5lJXKARS0" resolve="AbstractNode" />
+      </node>
+      <node concept="tn0Fv" id="dfChU1zo4G" role="HhnKV">
+        <property role="tnX3d" value="false" />
+      </node>
+    </node>
+  </node>
+  <node concept="1TIwiD" id="1OShD0HAY6y">
+    <property role="3GE5qa" value="node" />
+    <property role="TrG5h" value="ListNode" />
+    <ref role="1TJDcQ" node="5lJXKARS0" resolve="AbstractNode" />
+    <node concept="1TJgyj" id="1OShD0HAZ38" role="1TKVEi">
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="contents" />
+      <property role="20lbJX" value="0..n" />
+      <ref role="20lvS9" node="5lJXKARS0" resolve="AbstractNode" />
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/languageModels/typesystem.mps b/languages/jetbrains.mps.logic/languageModels/typesystem.mps
index f939aa4e..e5b8b87e 100644
--- a/languages/jetbrains.mps.logic/languageModels/typesystem.mps
+++ b/languages/jetbrains.mps.logic/languageModels/typesystem.mps
@@ -7,32 +7,88 @@
   </languages>
   <imports>
     <import index="ie8e" ref="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.unification.tree)" />
+    <import index="xq5w" ref="r:729bada4-05fa-458f-8bf8-28b9cb978726(jetbrains.mps.logic.builtin.variable)" />
+    <import index="tpee" ref="r:00000000-0000-4000-0000-011c895902ca(jetbrains.mps.baseLanguage.structure)" />
+    <import index="yg8f" ref="r:e213377a-f1a7-4ba7-9d08-96bcb97ed8ce(jetbrains.mps.logic.builtin)" />
     <import index="5j4j" ref="r:c8fb1c5e-8204-4904-a38f-678899d447c1(jetbrains.mps.logic.structure)" implicit="true" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
+        <child id="1197027771414" name="operand" index="2Oq$k0" />
+        <child id="1197027833540" name="operation" index="2OqNvi" />
+      </concept>
+      <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
+        <child id="1137022507850" name="body" index="2VODD2" />
+      </concept>
+      <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
+        <child id="1068580123156" name="expression" index="3clFbG" />
+      </concept>
       <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
         <child id="1068581517665" name="statement" index="3cqZAp" />
       </concept>
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
       </concept>
+      <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
+        <property id="6329021646629104958" name="text" index="3SKdUp" />
+      </concept>
+      <concept id="6329021646629104954" name="jetbrains.mps.baseLanguage.structure.SingleLineComment" flags="nn" index="3SKdUt">
+        <child id="6329021646629175155" name="commentPart" index="3SKWNk" />
+      </concept>
+    </language>
+    <language id="d4615e3b-d671-4ba9-af01-2b78369b0ba7" name="jetbrains.mps.lang.pattern">
+      <concept id="1136720037777" name="jetbrains.mps.lang.pattern.structure.PatternExpression" flags="in" index="2DMOqp">
+        <child id="1136720037778" name="patternNode" index="2DMOqq" />
+      </concept>
     </language>
     <language id="3a13115c-633c-4c5c-bbcc-75c4219e9555" name="jetbrains.mps.lang.quotation">
       <concept id="1196350785113" name="jetbrains.mps.lang.quotation.structure.Quotation" flags="nn" index="2c44tf">
         <child id="1196350785114" name="quotedNode" index="2c44tc" />
       </concept>
+      <concept id="5455284157994012186" name="jetbrains.mps.lang.quotation.structure.NodeBuilderInitLink" flags="ng" index="2pIpSj">
+        <reference id="5455284157994012188" name="link" index="2pIpSl" />
+      </concept>
+      <concept id="5455284157993911097" name="jetbrains.mps.lang.quotation.structure.NodeBuilderInitPart" flags="ng" index="2pJxcK">
+        <child id="5455284157993911094" name="expression" index="2pJxcZ" />
+      </concept>
+      <concept id="5455284157993863837" name="jetbrains.mps.lang.quotation.structure.NodeBuilder" flags="nn" index="2pJPEk">
+        <child id="5455284157993863838" name="quotedNode" index="2pJPEn" />
+      </concept>
+      <concept id="5455284157993863840" name="jetbrains.mps.lang.quotation.structure.NodeBuilderNode" flags="nn" index="2pJPED">
+        <reference id="5455284157993910961" name="concept" index="2pJxaS" />
+        <child id="5455284157993911099" name="values" index="2pJxcM" />
+      </concept>
+      <concept id="8182547171709614739" name="jetbrains.mps.lang.quotation.structure.NodeBuilderRef" flags="nn" index="36bGnv">
+        <reference id="8182547171709614741" name="target" index="36bGnp" />
+      </concept>
     </language>
     <language id="7a5dda62-9140-4668-ab76-d5ed1746f2b2" name="jetbrains.mps.lang.typesystem">
       <concept id="1185788614172" name="jetbrains.mps.lang.typesystem.structure.NormalTypeClause" flags="ng" index="mw_s8">
         <child id="1185788644032" name="normalType" index="mwGJk" />
       </concept>
+      <concept id="1175147569072" name="jetbrains.mps.lang.typesystem.structure.AbstractSubtypingRule" flags="ig" index="2sgdUx">
+        <child id="1175147624276" name="body" index="2sgrp5" />
+      </concept>
+      <concept id="1175147670730" name="jetbrains.mps.lang.typesystem.structure.SubtypingRule" flags="ig" index="2sgARr" />
+      <concept id="1201607707634" name="jetbrains.mps.lang.typesystem.structure.InequationReplacementRule" flags="ig" index="35pCF_">
+        <child id="1201607798918" name="supertypeNode" index="35pZ6h" />
+        <child id="3592071576955708909" name="isApplicableClause" index="1xSnZW" />
+      </concept>
       <concept id="1195213580585" name="jetbrains.mps.lang.typesystem.structure.AbstractCheckingRule" flags="ig" index="18hYwZ">
         <child id="1195213635060" name="body" index="18ibNy" />
       </concept>
+      <concept id="3592071576955708904" name="jetbrains.mps.lang.typesystem.structure.IsReplacementRuleApplicable_ConceptFunction" flags="in" index="1xSnZT" />
+      <concept id="1178870617262" name="jetbrains.mps.lang.typesystem.structure.CoerceExpression" flags="nn" index="1UaxmW">
+        <child id="1178870894644" name="pattern" index="1Ub_4A" />
+        <child id="1178870894645" name="nodeToCoerce" index="1Ub_4B" />
+      </concept>
       <concept id="1174642788531" name="jetbrains.mps.lang.typesystem.structure.ConceptReference" flags="ig" index="1YaCAy">
         <reference id="1174642800329" name="concept" index="1YaFvo" />
       </concept>
+      <concept id="1174642900584" name="jetbrains.mps.lang.typesystem.structure.PatternCondition" flags="ig" index="1Yb3XT">
+        <child id="1174642936809" name="pattern" index="1YbcFS" />
+      </concept>
       <concept id="1174643105530" name="jetbrains.mps.lang.typesystem.structure.InferenceRule" flags="ig" index="1YbPZF" />
       <concept id="1174648085619" name="jetbrains.mps.lang.typesystem.structure.AbstractRule" flags="ng" index="1YuPPy">
         <child id="1174648101952" name="applicableNode" index="1YuTPh" />
@@ -49,7 +105,13 @@
         <child id="1174660783414" name="rightExpression" index="1ZfhKB" />
       </concept>
     </language>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="1172008320231" name="jetbrains.mps.lang.smodel.structure.Node_IsNotNullOperation" flags="nn" index="3x8VRR" />
+    </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
@@ -80,5 +142,69 @@
       <ref role="1YaFvo" to="5j4j:6$jH9oLmUCq" resolve="Ast" />
     </node>
   </node>
+  <node concept="2sgARr" id="1mP5b6jNJDj">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="supertypesOf_LogicalType" />
+    <node concept="3clFbS" id="1mP5b6jNJDk" role="2sgrp5">
+      <node concept="3clFbF" id="1mP5b6jNOOr" role="3cqZAp">
+        <node concept="2pJPEk" id="1mP5b6jNOOp" role="3clFbG">
+          <node concept="2pJPED" id="1mP5b6jOrlD" role="2pJPEn">
+            <ref role="2pJxaS" to="tpee:g7uibYu" resolve="ClassifierType" />
+            <node concept="2pIpSj" id="1mP5b6jOrp7" role="2pJxcM">
+              <ref role="2pIpSl" to="tpee:g7uigIF" />
+              <node concept="36bGnv" id="dfChU1uU1H" role="2pJxcZ">
+                <ref role="36bGnp" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="1YaCAy" id="1mP5b6jNJDm" role="1YuTPh">
+      <property role="TrG5h" value="lt" />
+      <ref role="1YaFvo" to="5j4j:1mP5b6jNC0S" resolve="LogicalType" />
+    </node>
+  </node>
+  <node concept="35pCF_" id="dfChU1jsd3">
+    <property role="3GE5qa" value="logical" />
+    <property role="TrG5h" value="ITreeLogical_subtypeOf_logical" />
+    <node concept="3clFbS" id="dfChU1jsd4" role="2sgrp5">
+      <node concept="3SKdUt" id="dfChU1jzdK" role="3cqZAp">
+        <node concept="3SKdUq" id="dfChU1jzqi" role="3SKWNk">
+          <property role="3SKdUp" value="yes" />
+        </node>
+      </node>
+    </node>
+    <node concept="1YaCAy" id="dfChU1jtEQ" role="35pZ6h">
+      <property role="TrG5h" value="logicalType" />
+      <ref role="1YaFvo" to="5j4j:1mP5b6jNC0S" resolve="LogicalType" />
+    </node>
+    <node concept="1YaCAy" id="dfChU1jtEr" role="1YuTPh">
+      <property role="TrG5h" value="ct" />
+      <ref role="1YaFvo" to="tpee:g7uibYu" resolve="ClassifierType" />
+    </node>
+    <node concept="1xSnZT" id="dfChU1jtFt" role="1xSnZW">
+      <node concept="3clFbS" id="dfChU1jtFu" role="2VODD2">
+        <node concept="3clFbF" id="dfChU1jx6v" role="3cqZAp">
+          <node concept="2OqwBi" id="dfChU1jylg" role="3clFbG">
+            <node concept="1UaxmW" id="dfChU1jx6s" role="2Oq$k0">
+              <node concept="1YBJjd" id="dfChU1jxh4" role="1Ub_4B">
+                <ref role="1YBMHb" node="dfChU1jtEr" resolve="ct" />
+              </node>
+              <node concept="1Yb3XT" id="dfChU1kdib" role="1Ub_4A">
+                <property role="TrG5h" value="treeLogical" />
+                <node concept="2DMOqp" id="dfChU1kl43" role="1YbcFS">
+                  <node concept="3uibUv" id="dfChU1kmaS" role="2DMOqq">
+                    <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3x8VRR" id="dfChU1jz0$" role="2OqNvi" />
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin.mps
index ec1f5b2a..feb6a6d4 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin.mps
@@ -127,6 +127,9 @@
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
+      <concept id="7812454656619025416" name="jetbrains.mps.baseLanguage.structure.MethodDeclaration" flags="ng" index="1rXfSm">
+        <property id="8355037393041754995" name="isNative" index="2aFKle" />
+      </concept>
       <concept id="7812454656619025412" name="jetbrains.mps.baseLanguage.structure.LocalMethodCall" flags="nn" index="1rXfSq" />
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
@@ -147,7 +150,9 @@
         <child id="1144231399730" name="condition" index="1Dwp0S" />
         <child id="1144231408325" name="iteration" index="1Dwrff" />
       </concept>
-      <concept id="1107796713796" name="jetbrains.mps.baseLanguage.structure.Interface" flags="ig" index="3HP615" />
+      <concept id="1107796713796" name="jetbrains.mps.baseLanguage.structure.Interface" flags="ig" index="3HP615">
+        <child id="1107797138135" name="extendedInterface" index="3HQHJm" />
+      </concept>
       <concept id="1208890769693" name="jetbrains.mps.baseLanguage.structure.ArrayLengthOperation" flags="nn" index="1Rwk04" />
       <concept id="2580416627845338977" name="jetbrains.mps.baseLanguage.structure.ImplicitAnnotationInstanceValue" flags="ng" index="1SXeKx" />
       <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
@@ -815,5 +820,67 @@
       <node concept="TZ5HA" id="2fk6$tOs4KM" role="TZ5H$" />
     </node>
   </node>
+  <node concept="3HP615" id="1mP5b6jQP$C">
+    <property role="TrG5h" value="ILogical" />
+    <node concept="2tJIrI" id="1mP5b6jQPCY" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1eNVy" role="jymVt">
+      <property role="1EzhhJ" value="true" />
+      <property role="TrG5h" value="findRoot" />
+      <node concept="3uibUv" id="dfChU1eNWP" role="3clF45">
+        <ref role="3uigEE" node="1mP5b6jQP$C" resolve="ILogical" />
+        <node concept="16syzq" id="dfChU1eNXI" role="11_B2D">
+          <ref role="16sUi3" node="1mP5b6jQPCW" resolve="T" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="dfChU1eNV_" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1eNVA" role="3clF47" />
+    </node>
+    <node concept="2tJIrI" id="dfChU1eNUX" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQPMI" role="jymVt">
+      <property role="1EzhhJ" value="true" />
+      <property role="2aFKle" value="false" />
+      <property role="TrG5h" value="value" />
+      <node concept="3clFbS" id="1mP5b6jQPML" role="3clF47" />
+      <node concept="3Tm1VV" id="1mP5b6jQPMM" role="1B3o_S" />
+      <node concept="16syzq" id="1mP5b6jQPMn" role="3clF45">
+        <ref role="16sUi3" node="1mP5b6jQPCW" resolve="T" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQPM2" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQPKP" role="jymVt">
+      <property role="1EzhhJ" value="true" />
+      <property role="TrG5h" value="isBound" />
+      <node concept="10P_77" id="1mP5b6jQPLl" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQPKS" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQPKT" role="3clF47" />
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQPLC" role="jymVt" />
+    <node concept="3Tm1VV" id="1mP5b6jQP$D" role="1B3o_S" />
+    <node concept="16euLQ" id="1mP5b6jQPCW" role="16eVyc">
+      <property role="TrG5h" value="T" />
+    </node>
+  </node>
+  <node concept="3HP615" id="dfChU1jXdE">
+    <property role="TrG5h" value="ITreeLogical" />
+    <node concept="2tJIrI" id="dfChU1jXe_" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1jXeL" role="jymVt">
+      <property role="1EzhhJ" value="true" />
+      <property role="TrG5h" value="asTreePart" />
+      <node concept="3uibUv" id="dfChU1jXf8" role="3clF45">
+        <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="ITreePart" />
+        <node concept="3qTvmN" id="dfChU1jXfg" role="11_B2D" />
+      </node>
+      <node concept="3Tm1VV" id="dfChU1jXeO" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1jXeP" role="3clF47" />
+    </node>
+    <node concept="2tJIrI" id="dfChU1jXeE" role="jymVt" />
+    <node concept="3Tm1VV" id="dfChU1jXdF" role="1B3o_S" />
+    <node concept="3uibUv" id="dfChU1jXdV" role="3HQHJm">
+      <ref role="3uigEE" node="1mP5b6jQP$C" resolve="ILogical" />
+      <node concept="3uibUv" id="dfChU1jXec" role="11_B2D">
+        <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
index 134106ba..d902beb7 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/unification.mps
@@ -187,6 +187,9 @@
       <concept id="1171903916106" name="jetbrains.mps.baseLanguage.structure.UpperBoundType" flags="in" index="3qUE_q">
         <child id="1171903916107" name="bound" index="3qUE_r" />
       </concept>
+      <concept id="7812454656619025416" name="jetbrains.mps.baseLanguage.structure.MethodDeclaration" flags="ng" index="1rXfSm">
+        <property id="8355037393041754995" name="isNative" index="2aFKle" />
+      </concept>
       <concept id="7812454656619025412" name="jetbrains.mps.baseLanguage.structure.LocalMethodCall" flags="nn" index="1rXfSq" />
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
@@ -2890,6 +2893,25 @@
       </node>
     </node>
     <node concept="2tJIrI" id="4U_yxogCsEV" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1gcsX" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="findRoot" />
+      <node concept="3uibUv" id="dfChU1ks09" role="3clF45">
+        <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+      </node>
+      <node concept="3Tm1VV" id="dfChU1gct0" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1gct6" role="3clF47">
+        <node concept="3clFbF" id="dfChU1ggsh" role="3cqZAp">
+          <node concept="1rXfSq" id="dfChU1ggsg" role="3clFbG">
+            <ref role="37wK5l" node="4U_yxogCtqr" resolve="findTree" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="dfChU1gf8K" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="dfChU1gdQ7" role="jymVt" />
     <node concept="3clFb_" id="4U_yxogCtqr" role="jymVt">
       <property role="TrG5h" value="findTree" />
       <node concept="3uibUv" id="4U_yxogCtVF" role="3clF45">
@@ -2916,7 +2938,7 @@
     </node>
     <node concept="2tJIrI" id="1Ns6gpY6S29" role="jymVt" />
     <node concept="3clFb_" id="1Ns6gpY6DeD" role="jymVt">
-      <property role="TrG5h" value="toTreePart" />
+      <property role="TrG5h" value="asTreePart" />
       <node concept="3uibUv" id="1Ns6gpY6FOz" role="3clF45">
         <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="ITreePart" />
         <node concept="3qUE_q" id="1Ns6gpY6GI4" role="11_B2D">
@@ -2990,6 +3012,9 @@
           </node>
         </node>
       </node>
+      <node concept="2AHcQZ" id="dfChU1ktNm" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
     </node>
     <node concept="2tJIrI" id="7d$oK1$sHHt" role="jymVt" />
     <node concept="3clFb_" id="7d$oK1$sGde" role="jymVt">
@@ -3084,6 +3109,9 @@
       <node concept="3uibUv" id="4U_yxogCKH9" role="3clF45">
         <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
       </node>
+      <node concept="2AHcQZ" id="1mP5b6jR6Yr" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
     </node>
     <node concept="2tJIrI" id="1Ns6gpY6Ey_" role="jymVt" />
     <node concept="3clFb_" id="1bm7a6ETW$4" role="jymVt">
@@ -3121,6 +3149,23 @@
       </node>
     </node>
     <node concept="2tJIrI" id="7d$oK1$CzQe" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jR8dI" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="isBound" />
+      <node concept="10P_77" id="1mP5b6jR8dJ" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jR8dK" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jR8dP" role="3clF47">
+        <node concept="3clFbF" id="1mP5b6jRce3" role="3cqZAp">
+          <node concept="1rXfSq" id="1mP5b6jRce2" role="3clFbG">
+            <ref role="37wK5l" to="w2rx:~Logical.isNonVar():boolean" resolve="isNonVar" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jRaWb" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jR9_e" role="jymVt" />
     <node concept="3clFb_" id="7d$oK1$qKLo" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="reactivateAndClearObservers" />
@@ -3608,6 +3653,9 @@
         <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
       </node>
     </node>
+    <node concept="3uibUv" id="dfChU1k2Og" role="EKbjA">
+      <ref role="3uigEE" to="yg8f:dfChU1jXdE" resolve="ITreeLogical" />
+    </node>
   </node>
   <node concept="312cEu" id="1Ns6gpY6jYh">
     <property role="TrG5h" value="TreeLogicalVar" />
@@ -4123,7 +4171,66 @@
       </node>
     </node>
     <node concept="2tJIrI" id="1H8E3iBdJUE" role="jymVt" />
-    <node concept="2tJIrI" id="1H8E3iBdJUZ" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1gi$L" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="findRoot" />
+      <node concept="3uibUv" id="dfChU1gi$M" role="3clF45">
+        <ref role="3uigEE" to="yg8f:1mP5b6jQP$C" resolve="ILogical" />
+        <node concept="17QB3L" id="dfChU1gi$T" role="11_B2D" />
+      </node>
+      <node concept="3Tm1VV" id="dfChU1gi$O" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1gi$U" role="3clF47">
+        <node concept="3clFbF" id="dfChU1gkqG" role="3cqZAp">
+          <node concept="10QFUN" id="dfChU1gl7$" role="3clFbG">
+            <node concept="1rXfSq" id="dfChU1gl7z" role="10QFUP">
+              <ref role="37wK5l" to="w2rx:~Logical.find():runtime.Logical" resolve="find" />
+            </node>
+            <node concept="3uibUv" id="dfChU1glDa" role="10QFUM">
+              <ref role="3uigEE" node="1H8E3iB85PX" resolve="StringLogical" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="dfChU1gjOV" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="dfChU1gjdF" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQWhb" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="2aFKle" value="false" />
+      <property role="TrG5h" value="value" />
+      <node concept="3Tm1VV" id="1mP5b6jQWhd" role="1B3o_S" />
+      <node concept="17QB3L" id="1mP5b6jQWhi" role="3clF45" />
+      <node concept="3clFbS" id="1mP5b6jQWhj" role="3clF47">
+        <node concept="3clFbF" id="1mP5b6jQXtl" role="3cqZAp">
+          <node concept="1rXfSq" id="1mP5b6jQXtj" role="3clFbG">
+            <ref role="37wK5l" to="w2rx:~Logical.getValue():java.lang.Object" resolve="getValue" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQZi$" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQX$l" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQWhk" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="isBound" />
+      <node concept="10P_77" id="1mP5b6jQWhl" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQWhm" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQWhr" role="3clF47">
+        <node concept="3clFbF" id="1mP5b6jQYKc" role="3cqZAp">
+          <node concept="1rXfSq" id="1mP5b6jQYKb" role="3clFbG">
+            <ref role="37wK5l" to="w2rx:~Logical.isNonVar():boolean" resolve="isNonVar" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQZOV" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQY9f" role="jymVt" />
     <node concept="3clFb_" id="1H8E3iBdJX9" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="equals" />
@@ -4364,6 +4471,10 @@
         </node>
       </node>
     </node>
+    <node concept="3uibUv" id="1mP5b6jQTY7" role="EKbjA">
+      <ref role="3uigEE" to="yg8f:1mP5b6jQP$C" resolve="ILogical" />
+      <node concept="17QB3L" id="1mP5b6jQUWt" role="11_B2D" />
+    </node>
   </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/variable.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/variable.mps
index 9e55d59a..c39835a3 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/variable.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/variable.mps
@@ -21,6 +21,7 @@
         <child id="1068498886297" name="rValue" index="37vLTx" />
         <child id="1068498886295" name="lValue" index="37vLTJ" />
       </concept>
+      <concept id="1153417849900" name="jetbrains.mps.baseLanguage.structure.GreaterThanOrEqualsExpression" flags="nn" index="2d3UOw" />
       <concept id="1202948039474" name="jetbrains.mps.baseLanguage.structure.InstanceMethodCallOperation" flags="nn" index="liA8E" />
       <concept id="1465982738277781862" name="jetbrains.mps.baseLanguage.structure.PlaceholderMember" flags="ng" index="2tJIrI" />
       <concept id="1173175405605" name="jetbrains.mps.baseLanguage.structure.ArrayAccessExpression" flags="nn" index="AH0OO">
@@ -33,6 +34,9 @@
       <concept id="1188208481402" name="jetbrains.mps.baseLanguage.structure.HasAnnotation" flags="ng" index="2AJDlI">
         <child id="1188208488637" name="annotation" index="2AJF6D" />
       </concept>
+      <concept id="1224848483129" name="jetbrains.mps.baseLanguage.structure.IBLDeprecatable" flags="ng" index="IEa8$">
+        <property id="1224848525476" name="isDeprecated" index="IEkAT" />
+      </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
@@ -45,21 +49,25 @@
       </concept>
       <concept id="1070462154015" name="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" flags="ig" index="Wx3nA" />
       <concept id="1070475354124" name="jetbrains.mps.baseLanguage.structure.ThisExpression" flags="nn" index="Xjq3P" />
+      <concept id="1070475587102" name="jetbrains.mps.baseLanguage.structure.SuperConstructorInvocation" flags="nn" index="XkiVB" />
       <concept id="1070475926800" name="jetbrains.mps.baseLanguage.structure.StringLiteral" flags="nn" index="Xl_RD">
         <property id="1070475926801" name="value" index="Xl_RC" />
       </concept>
       <concept id="1182160077978" name="jetbrains.mps.baseLanguage.structure.AnonymousClassCreator" flags="nn" index="YeOm9">
         <child id="1182160096073" name="cls" index="YeSDq" />
       </concept>
+      <concept id="1081236700938" name="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" flags="ig" index="2YIFZL" />
       <concept id="1164991038168" name="jetbrains.mps.baseLanguage.structure.ThrowStatement" flags="nn" index="YS8fn">
         <child id="1164991057263" name="throwable" index="YScLw" />
       </concept>
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
+      <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
       <concept id="1070534644030" name="jetbrains.mps.baseLanguage.structure.BooleanType" flags="in" index="10P_77" />
       <concept id="1068390468200" name="jetbrains.mps.baseLanguage.structure.FieldDeclaration" flags="ig" index="312cEg" />
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
         <property id="1075300953594" name="abstractClass" index="1sVAO0" />
         <child id="1095933932569" name="implementedInterface" index="EKbjA" />
+        <child id="1165602531693" name="superclass" index="1zkMxy" />
       </concept>
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
         <property id="1176718929932" name="isFinal" index="3TUv4t" />
@@ -75,6 +83,8 @@
         <child id="5680397130376446158" name="type" index="1tU5fm" />
       </concept>
       <concept id="1068580123132" name="jetbrains.mps.baseLanguage.structure.BaseMethodDeclaration" flags="ng" index="3clF44">
+        <property id="4276006055363816570" name="isSynchronized" index="od$2w" />
+        <property id="1181808852946" name="isFinal" index="DiZV1" />
         <child id="1068580123133" name="returnType" index="3clF45" />
         <child id="1068580123134" name="parameter" index="3clF46" />
         <child id="1068580123135" name="body" index="3clF47" />
@@ -82,6 +92,7 @@
       <concept id="1068580123165" name="jetbrains.mps.baseLanguage.structure.InstanceMethodDeclaration" flags="ig" index="3clFb_">
         <property id="1178608670077" name="isAbstract" index="1EzhhJ" />
       </concept>
+      <concept id="1068580123152" name="jetbrains.mps.baseLanguage.structure.EqualsExpression" flags="nn" index="3clFbC" />
       <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
         <child id="1068580123156" name="expression" index="3clFbG" />
       </concept>
@@ -96,7 +107,12 @@
       <concept id="1068580320020" name="jetbrains.mps.baseLanguage.structure.IntegerConstant" flags="nn" index="3cmrfG">
         <property id="1068580320021" name="value" index="3cmrfH" />
       </concept>
+      <concept id="1068581242875" name="jetbrains.mps.baseLanguage.structure.PlusExpression" flags="nn" index="3cpWs3" />
+      <concept id="1068581242878" name="jetbrains.mps.baseLanguage.structure.ReturnStatement" flags="nn" index="3cpWs6">
+        <child id="1068581517676" name="expression" index="3cqZAk" />
+      </concept>
       <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
+      <concept id="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
       <concept id="1204053956946" name="jetbrains.mps.baseLanguage.structure.IMethodCall" flags="ng" index="1ndlxa">
         <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
         <child id="1068499141038" name="actualArgument" index="37wK5m" />
@@ -107,6 +123,7 @@
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
+      <concept id="7812454656619025412" name="jetbrains.mps.baseLanguage.structure.LocalMethodCall" flags="nn" index="1rXfSq" />
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
         <child id="1109201940907" name="parameter" index="11_B2D" />
@@ -504,5 +521,267 @@
       <node concept="17QB3L" id="5$WbtTOYtZv" role="1tU5fm" />
     </node>
   </node>
+  <node concept="312cEu" id="7E86$tKu5$t">
+    <property role="TrG5h" value="IndexedVar" />
+    <node concept="2tJIrI" id="7E86$tKujIh" role="jymVt" />
+    <node concept="2YIFZL" id="5k_shARN93B" role="jymVt">
+      <property role="TrG5h" value="withName" />
+      <node concept="37vLTG" id="5k_shARN99m" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="5k_shARN9ao" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="7E86$tKul$6" role="3clF45">
+        <ref role="3uigEE" node="7E86$tKu5$t" resolve="IndexedVar" />
+      </node>
+      <node concept="3Tm1VV" id="5k_shARN93E" role="1B3o_S" />
+      <node concept="3clFbS" id="5k_shARN93F" role="3clF47">
+        <node concept="3clFbJ" id="5k_shARO2Lw" role="3cqZAp">
+          <node concept="3clFbS" id="5k_shARO2Lx" role="3clFbx">
+            <node concept="YS8fn" id="5k_shARO2Xr" role="3cqZAp">
+              <node concept="2ShNRf" id="5k_shARO2ZW" role="YScLw">
+                <node concept="1pGfFk" id="5k_shAROcb3" role="2ShVmc">
+                  <ref role="37wK5l" to="e2lb:~NullPointerException.&lt;init&gt;()" resolve="NullPointerException" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="5k_shARO2Vo" role="3clFbw">
+            <node concept="10Nm6u" id="5k_shARO2VU" role="3uHU7w" />
+            <node concept="37vLTw" id="5k_shARO2MJ" role="3uHU7B">
+              <ref role="3cqZAo" node="5k_shARN99m" resolve="name" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs6" id="5k_shAROch4" role="3cqZAp">
+          <node concept="2ShNRf" id="5k_shAROcjf" role="3cqZAk">
+            <node concept="1pGfFk" id="5k_shAROcje" role="2ShVmc">
+              <ref role="37wK5l" node="5k_shARNZ68" resolve="IndexedVar" />
+              <node concept="37vLTw" id="5k_shAROclP" role="37wK5m">
+                <ref role="3cqZAo" node="5k_shARN99m" resolve="name" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5k_shARNY8w" role="jymVt" />
+    <node concept="2YIFZL" id="5k_shARNYdh" role="jymVt">
+      <property role="TrG5h" value="withNameAndIndex" />
+      <node concept="37vLTG" id="5k_shARNYf$" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="5k_shARNYgy" role="1tU5fm" />
+      </node>
+      <node concept="37vLTG" id="5k_shARNYtF" role="3clF46">
+        <property role="TrG5h" value="idx" />
+        <node concept="10Oyi0" id="5k_shARNYuJ" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="7E86$tKulDN" role="3clF45">
+        <ref role="3uigEE" node="7E86$tKu5$t" resolve="IndexedVar" />
+      </node>
+      <node concept="3Tm1VV" id="5k_shARNYdk" role="1B3o_S" />
+      <node concept="3clFbS" id="5k_shARNYdl" role="3clF47">
+        <node concept="3clFbJ" id="5k_shAROdjJ" role="3cqZAp">
+          <node concept="3clFbS" id="5k_shAROdjK" role="3clFbx">
+            <node concept="YS8fn" id="5k_shAROdww" role="3cqZAp">
+              <node concept="2ShNRf" id="5k_shAROdxH" role="YScLw">
+                <node concept="1pGfFk" id="5k_shAROdLN" role="2ShVmc">
+                  <ref role="37wK5l" to="e2lb:~NullPointerException.&lt;init&gt;()" resolve="NullPointerException" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="5k_shAROdsL" role="3clFbw">
+            <node concept="10Nm6u" id="5k_shAROdtj" role="3uHU7w" />
+            <node concept="37vLTw" id="5k_shAROdk8" role="3uHU7B">
+              <ref role="3cqZAo" node="5k_shARNYf$" resolve="name" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="5k_shAROe6H" role="3cqZAp">
+          <node concept="3clFbS" id="5k_shAROe6K" role="3clFbx">
+            <node concept="YS8fn" id="5k_shAROeGr" role="3cqZAp">
+              <node concept="2ShNRf" id="5k_shAROeHC" role="YScLw">
+                <node concept="1pGfFk" id="5k_shAROeZ2" role="2ShVmc">
+                  <ref role="37wK5l" to="e2lb:~IllegalArgumentException.&lt;init&gt;()" resolve="IllegalArgumentException" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3eOVzh" id="5k_shAROeAI" role="3clFbw">
+            <node concept="37vLTw" id="5k_shAROeAL" role="3uHU7B">
+              <ref role="3cqZAo" node="5k_shARNYtF" resolve="idx" />
+            </node>
+            <node concept="3cmrfG" id="5k_shAROeAK" role="3uHU7w">
+              <property role="3cmrfH" value="0" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs6" id="5k_shAROffB" role="3cqZAp">
+          <node concept="2ShNRf" id="5k_shAROfkg" role="3cqZAk">
+            <node concept="1pGfFk" id="5k_shAROfjp" role="2ShVmc">
+              <ref role="37wK5l" node="5k_shARNZar" resolve="IndexedVar" />
+              <node concept="37vLTw" id="5k_shAROfoP" role="37wK5m">
+                <ref role="3cqZAo" node="5k_shARNYf$" resolve="name" />
+              </node>
+              <node concept="37vLTw" id="5k_shAROfvZ" role="37wK5m">
+                <ref role="3cqZAo" node="5k_shARNYtF" resolve="idx" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5k_shARNZ4q" role="jymVt" />
+    <node concept="3clFbW" id="5k_shARNZ68" role="jymVt">
+      <node concept="37vLTG" id="5k_shARNZ7A" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="5k_shARNZ7I" role="1tU5fm" />
+      </node>
+      <node concept="3cqZAl" id="5k_shARNZ6a" role="3clF45" />
+      <node concept="3Tm1VV" id="5k_shARNZ6b" role="1B3o_S" />
+      <node concept="3clFbS" id="5k_shARNZ6c" role="3clF47">
+        <node concept="XkiVB" id="104EUzFJTsl" role="3cqZAp">
+          <ref role="37wK5l" to="ie8e:uNmovXiEVu" resolve="Variable" />
+          <node concept="37vLTw" id="104EUzFJU4w" role="37wK5m">
+            <ref role="3cqZAo" node="5k_shARNZ7A" resolve="name" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="5k_shAROgOv" role="3cqZAp">
+          <node concept="37vLTI" id="5k_shAROh_S" role="3clFbG">
+            <node concept="3cmrfG" id="5k_shAROhCn" role="37vLTx">
+              <property role="3cmrfH" value="-1" />
+            </node>
+            <node concept="2OqwBi" id="5k_shAROhj0" role="37vLTJ">
+              <node concept="Xjq3P" id="5k_shAROgOt" role="2Oq$k0" />
+              <node concept="2OwXpG" id="5k_shAROhl4" role="2OqNvi">
+                <ref role="2Oxat5" node="5k_shARO0vR" resolve="idx" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5k_shARNZcd" role="jymVt" />
+    <node concept="3clFbW" id="5k_shARNZar" role="jymVt">
+      <node concept="37vLTG" id="5k_shARNZas" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="5k_shARNZat" role="1tU5fm" />
+      </node>
+      <node concept="37vLTG" id="5k_shARNZd$" role="3clF46">
+        <property role="TrG5h" value="idx" />
+        <node concept="10Oyi0" id="5k_shARNZeJ" role="1tU5fm" />
+      </node>
+      <node concept="3cqZAl" id="5k_shARNZau" role="3clF45" />
+      <node concept="3Tm1VV" id="5k_shARNZav" role="1B3o_S" />
+      <node concept="3clFbS" id="5k_shARNZaw" role="3clF47">
+        <node concept="XkiVB" id="104EUzFJVh8" role="3cqZAp">
+          <ref role="37wK5l" to="ie8e:uNmovXiEVu" resolve="Variable" />
+          <node concept="37vLTw" id="104EUzFJVRA" role="37wK5m">
+            <ref role="3cqZAo" node="5k_shARNZas" resolve="name" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="5k_shARO0vV" role="3cqZAp">
+          <node concept="37vLTI" id="5k_shARO0vX" role="3clFbG">
+            <node concept="2OqwBi" id="5k_shARO0w1" role="37vLTJ">
+              <node concept="Xjq3P" id="5k_shARO0w4" role="2Oq$k0" />
+              <node concept="2OwXpG" id="5k_shARO0w0" role="2OqNvi">
+                <ref role="2Oxat5" node="5k_shARO0vR" resolve="idx" />
+              </node>
+            </node>
+            <node concept="37vLTw" id="5k_shARO0w5" role="37vLTx">
+              <ref role="3cqZAo" node="5k_shARNZd$" resolve="idx" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="6w6CYIReErb" role="jymVt" />
+    <node concept="3clFb_" id="6w6CYIReEWt" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="name" />
+      <property role="DiZV1" value="false" />
+      <property role="od$2w" value="false" />
+      <node concept="3Tm1VV" id="6w6CYIReEWu" role="1B3o_S" />
+      <node concept="17QB3L" id="2pvEdqukxHS" role="3clF45" />
+      <node concept="3clFbS" id="6w6CYIReEWx" role="3clF47">
+        <node concept="3clFbF" id="7d9KVSzUTiQ" role="3cqZAp">
+          <node concept="1rXfSq" id="7d9KVSzUTiP" role="3clFbG">
+            <ref role="37wK5l" node="7d9KVSzUO6L" resolve="nameWithIndex" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="6w6CYIReT2K" role="jymVt" />
+    <node concept="3clFb_" id="5k_shARO1gZ" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="toString" />
+      <property role="DiZV1" value="false" />
+      <property role="IEkAT" value="false" />
+      <node concept="3Tm1VV" id="5k_shARO1h0" role="1B3o_S" />
+      <node concept="17QB3L" id="2pvEdqukxHT" role="3clF45" />
+      <node concept="3clFbS" id="5k_shARO1h3" role="3clF47">
+        <node concept="3cpWs6" id="7d9KVSzUO6P" role="3cqZAp">
+          <node concept="1rXfSq" id="7d9KVSzUO6O" role="3cqZAk">
+            <ref role="37wK5l" node="7d9KVSzUO6L" resolve="nameWithIndex" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="5k_shARO1h4" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="7d9KVSzUPIj" role="jymVt" />
+    <node concept="3clFb_" id="7d9KVSzUO6L" role="jymVt">
+      <property role="TrG5h" value="nameWithIndex" />
+      <node concept="3Tm6S6" id="7d9KVSzUO6M" role="1B3o_S" />
+      <node concept="17QB3L" id="7d9KVSzUO6N" role="3clF45" />
+      <node concept="3clFbS" id="7d9KVSzUO6x" role="3clF47">
+        <node concept="3clFbJ" id="7d9KVSzUO6y" role="3cqZAp">
+          <node concept="3clFbS" id="7d9KVSzUO6z" role="3clFbx">
+            <node concept="3cpWs6" id="7d9KVSzUO6$" role="3cqZAp">
+              <node concept="3cpWs3" id="7d9KVSzUO6_" role="3cqZAk">
+                <node concept="37vLTw" id="7d9KVSzUO6A" role="3uHU7w">
+                  <ref role="3cqZAo" node="5k_shARO0vR" resolve="idx" />
+                </node>
+                <node concept="3cpWs3" id="7d9KVSzUO6B" role="3uHU7B">
+                  <node concept="37vLTw" id="7d9KVSzUO6C" role="3uHU7B">
+                    <ref role="3cqZAo" to="ie8e:uNmovXiF5Z" resolve="name" />
+                  </node>
+                  <node concept="Xl_RD" id="7d9KVSzUO6D" role="3uHU7w">
+                    <property role="Xl_RC" value="_" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="2d3UOw" id="7d9KVSzUO6E" role="3clFbw">
+            <node concept="3cmrfG" id="7d9KVSzUO6F" role="3uHU7w">
+              <property role="3cmrfH" value="0" />
+            </node>
+            <node concept="37vLTw" id="7d9KVSzUO6G" role="3uHU7B">
+              <ref role="3cqZAo" node="5k_shARO0vR" resolve="idx" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs6" id="7d9KVSzUO6H" role="3cqZAp">
+          <node concept="37vLTw" id="7d9KVSzUO6I" role="3cqZAk">
+            <ref role="3cqZAo" to="ie8e:uNmovXiF5Z" resolve="name" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="104EUzFJWVQ" role="jymVt" />
+    <node concept="312cEg" id="5k_shARO0vR" role="jymVt">
+      <property role="TrG5h" value="idx" />
+      <property role="3TUv4t" value="true" />
+      <node concept="3Tm6S6" id="5k_shARO0vS" role="1B3o_S" />
+      <node concept="10Oyi0" id="5k_shARO0vU" role="1tU5fm" />
+    </node>
+    <node concept="2tJIrI" id="7E86$tKujIj" role="jymVt" />
+    <node concept="3Tm1VV" id="7E86$tKu5$u" role="1B3o_S" />
+    <node concept="3uibUv" id="7E86$tKu5YS" role="1zkMxy">
+      <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
+    </node>
+  </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/test/jetbrains.mps.logic.test.msd b/languages/jetbrains.mps.logic/test/jetbrains.mps.logic.test.msd
index 9fe0f0d5..7c1ae98c 100644
--- a/languages/jetbrains.mps.logic/test/jetbrains.mps.logic.test.msd
+++ b/languages/jetbrains.mps.logic/test/jetbrains.mps.logic.test.msd
@@ -22,11 +22,21 @@
     <usedLanguage>f61473f9-130f-42f6-b98d-6c438812c2f6(jetbrains.mps.baseLanguage.unitTest)</usedLanguage>
     <usedLanguage>35320f26-77cb-4c55-be9f-a97a27770af1(jetbrains.mps.logic)</usedLanguage>
   </usedLanguages>
+  <usedDevKits>
+    <usedDevKit>fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)</usedDevKit>
+  </usedDevKits>
   <languageVersions>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" fqName="jetbrains.mps.baseLanguage" version="1" />
     <language id="ed6d7656-532c-4bc2-81d1-af945aeb8280" fqName="jetbrains.mps.baseLanguage.blTypes" version="0" />
+    <language id="fd392034-7849-419d-9071-12563d152375" fqName="jetbrains.mps.baseLanguage.closures" version="0" />
+    <language id="83888646-71ce-4f1c-9c53-c54016f6ad4f" fqName="jetbrains.mps.baseLanguage.collections" version="0" />
+    <language id="f2801650-65d5-424e-bb1b-463a8781b786" fqName="jetbrains.mps.baseLanguage.javadoc" version="1" />
+    <language id="760a0a8c-eabb-4521-8bfd-65db761a9ba3" fqName="jetbrains.mps.baseLanguage.logging" version="0" />
+    <language id="a247e09e-2435-45ba-b8d2-07e93feba96a" fqName="jetbrains.mps.baseLanguage.tuples" version="0" />
     <language id="f61473f9-130f-42f6-b98d-6c438812c2f6" fqName="jetbrains.mps.baseLanguage.unitTest" version="0" />
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" fqName="jetbrains.mps.lang.core" version="1" />
+    <language id="3a13115c-633c-4c5c-bbcc-75c4219e9555" fqName="jetbrains.mps.lang.quotation" version="0" />
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" fqName="jetbrains.mps.lang.smodel" version="0" />
     <language id="9ded098b-ad6a-4657-bfd9-48636cfe8bc3" fqName="jetbrains.mps.lang.traceable" version="0" />
     <language id="35320f26-77cb-4c55-be9f-a97a27770af1" fqName="jetbrains.mps.logic" version="0" />
   </languageVersions>
diff --git a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps
new file mode 100644
index 00000000..52d060ad
--- /dev/null
+++ b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/logical.mps
@@ -0,0 +1,1185 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:74d684e5-5094-483e-b711-7edd0235f56a(jetbrains.mps.logic.test.logical)">
+  <persistence version="9" />
+  <languages>
+    <use id="f61473f9-130f-42f6-b98d-6c438812c2f6" name="jetbrains.mps.baseLanguage.unitTest" version="-1" />
+    <use id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic" version="0" />
+    <devkit ref="fbc25dd2-5da4-483a-8b19-70928e1b62d7(jetbrains.mps.devkit.general-purpose)" />
+  </languages>
+  <imports>
+    <import index="ie8e" ref="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.unification.tree)" />
+    <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.builtin.unification)" />
+  </imports>
+  <registry>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
+        <child id="1145553007750" name="creator" index="2ShVmc" />
+      </concept>
+      <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
+        <child id="1068431790190" name="initializer" index="33vP2m" />
+      </concept>
+      <concept id="1068498886296" name="jetbrains.mps.baseLanguage.structure.VariableReference" flags="nn" index="37vLTw">
+        <reference id="1068581517664" name="variableDeclaration" index="3cqZAo" />
+      </concept>
+      <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
+        <child id="5680397130376446158" name="type" index="1tU5fm" />
+      </concept>
+      <concept id="1068580123132" name="jetbrains.mps.baseLanguage.structure.BaseMethodDeclaration" flags="ng" index="3clF44">
+        <child id="1068580123133" name="returnType" index="3clF45" />
+        <child id="1068580123135" name="body" index="3clF47" />
+      </concept>
+      <concept id="1068580123157" name="jetbrains.mps.baseLanguage.structure.Statement" flags="nn" index="3clFbH" />
+      <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
+        <child id="1068581517665" name="statement" index="3cqZAp" />
+      </concept>
+      <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
+        <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
+      </concept>
+      <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
+      <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
+      <concept id="1204053956946" name="jetbrains.mps.baseLanguage.structure.IMethodCall" flags="ng" index="1ndlxa">
+        <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
+        <child id="1068499141038" name="actualArgument" index="37wK5m" />
+      </concept>
+      <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk" />
+      <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
+        <reference id="1107535924139" name="classifier" index="3uigEE" />
+      </concept>
+      <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
+        <child id="1178549979242" name="visibility" index="1B3o_S" />
+      </concept>
+      <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
+    </language>
+    <language id="f61473f9-130f-42f6-b98d-6c438812c2f6" name="jetbrains.mps.baseLanguage.unitTest">
+      <concept id="1171931690126" name="jetbrains.mps.baseLanguage.unitTest.structure.TestMethod" flags="ig" index="3s$Bmu">
+        <property id="1171931690128" name="methodName" index="3s$Bm0" />
+      </concept>
+      <concept id="1171931851043" name="jetbrains.mps.baseLanguage.unitTest.structure.BTestCase" flags="ig" index="3s_ewN">
+        <property id="1171931851045" name="testCaseName" index="3s_ewP" />
+        <child id="1171931851044" name="testMethodList" index="3s_ewO" />
+      </concept>
+      <concept id="1171931858461" name="jetbrains.mps.baseLanguage.unitTest.structure.TestMethodList" flags="ng" index="3s_gsd">
+        <child id="1171931858462" name="testMethod" index="3s_gse" />
+      </concept>
+      <concept id="8427750732757990717" name="jetbrains.mps.baseLanguage.unitTest.structure.BinaryAssert" flags="nn" index="3tpDYu">
+        <child id="8427750732757990725" name="actual" index="3tpDZA" />
+        <child id="8427750732757990724" name="expected" index="3tpDZB" />
+      </concept>
+      <concept id="1171978097730" name="jetbrains.mps.baseLanguage.unitTest.structure.AssertEquals" flags="nn" index="3vlDli" />
+    </language>
+    <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
+      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.NodeSubstitution" flags="ng" index="22Ky0T">
+        <child id="238586457668550958" name="expression" index="22Ky0K" />
+      </concept>
+      <concept id="1564179198502666296" name="jetbrains.mps.logic.structure.LogicalType" flags="ig" index="26uTi9" />
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.ListNode" flags="ng" index="KCUsM">
+        <child id="2105510410850136264" name="contents" index="KCVpo" />
+      </concept>
+      <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.Ast" flags="ng" index="1oi1Uc">
+        <child id="7571593955706125526" name="root" index="1oi0x0" />
+      </concept>
+      <concept id="7571593955706137263" name="jetbrains.mps.logic.structure.ChildRole" flags="ng" index="1oi5ST">
+        <child id="7571593955706137319" name="contents" index="1oi5TL" />
+      </concept>
+      <concept id="7571593955706137125" name="jetbrains.mps.logic.structure.Node" flags="ng" index="1oi5UN">
+        <child id="7571593955706284441" name="role" index="1ojpOf" />
+      </concept>
+      <concept id="7571593955706137189" name="jetbrains.mps.logic.structure.Role" flags="ng" index="1oi5VN">
+        <property id="7571593955706137428" name="cardinality" index="1oi5Z2" />
+      </concept>
+      <concept id="7571593955706137472" name="jetbrains.mps.logic.structure.ValueRole" flags="ng" index="1oi5Wm">
+        <child id="7571593955706137672" name="contents" index="1oi5zu" />
+      </concept>
+      <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.ValueHolder" flags="ng" index="1oi5XN">
+        <property id="7571593955706137638" name="value" index="1oi5yK" />
+      </concept>
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="3s_ewN" id="1mP5b6jPiAZ">
+    <property role="3s_ewP" value="MatchTree" />
+    <node concept="3Tm1VV" id="1mP5b6jPiB0" role="1B3o_S" />
+    <node concept="3s_gsd" id="1mP5b6jPiB1" role="3s_ewO">
+      <node concept="3s$Bmu" id="1mP5b6jPr4u" role="3s_gse">
+        <property role="3s$Bm0" value="empty" />
+        <node concept="3cqZAl" id="1mP5b6jPr4w" role="3clF45" />
+        <node concept="3Tm1VV" id="1mP5b6jPr4y" role="1B3o_S" />
+        <node concept="3clFbS" id="1mP5b6jPr4z" role="3clF47">
+          <node concept="3clFbH" id="1mP5b6jPr9G" role="3cqZAp" />
+          <node concept="3cpWs8" id="1mP5b6jPriG" role="3cqZAp">
+            <node concept="3cpWsn" id="1mP5b6jPriH" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="1mP5b6jPriF" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1mP5b6jPriI" role="33vP2m">
+                <node concept="1oi5UN" id="1mP5b6jPriJ" role="1oi0x0" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1mP5b6jPrr$" role="3cqZAp" />
+          <node concept="3cpWs8" id="1mP5b6jPrpY" role="3cqZAp">
+            <node concept="3cpWsn" id="1mP5b6jPrpZ" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1mP5b6jPrq0" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1mP5b6jPrq1" role="33vP2m">
+                <node concept="1oi5UN" id="1mP5b6jPrq2" role="1oi0x0" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1mP5b6jProM" role="3cqZAp" />
+          <node concept="3vlDli" id="1mP5b6jPrwU" role="3cqZAp">
+            <node concept="37vLTw" id="1mP5b6jPryL" role="3tpDZA">
+              <ref role="3cqZAo" node="1mP5b6jPrpZ" resolve="b" />
+            </node>
+            <node concept="37vLTw" id="1mP5b6jPrxz" role="3tpDZB">
+              <ref role="3cqZAo" node="1mP5b6jPriH" resolve="a" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="1mP5b6jQ$dF" role="3s_gse">
+        <property role="3s$Bm0" value="value" />
+        <node concept="3cqZAl" id="1mP5b6jQ$dG" role="3clF45" />
+        <node concept="3Tm1VV" id="1mP5b6jQ$dH" role="1B3o_S" />
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+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0Ifj4O" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0Ifj4P" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0Ifj4Q" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0Ifj4R" role="1oi5TL">
+                      <node concept="22Ky0T" id="1OShD0Ifj4S" role="lGtFl">
+                        <node concept="37vLTw" id="1OShD0Ifj4T" role="22Ky0K">
+                          <ref role="3cqZAo" node="1OShD0Ifj4m" resolve="node" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0Ifj4U" role="3cqZAp" />
+          <node concept="3vlDli" id="1OShD0Ifj4V" role="3cqZAp">
+            <node concept="37vLTw" id="1OShD0Ifj4W" role="3tpDZA">
+              <ref role="3cqZAo" node="1OShD0Ifj4M" resolve="b" />
+            </node>
+            <node concept="37vLTw" id="1OShD0Ifj4X" role="3tpDZB">
+              <ref role="3cqZAo" node="1OShD0Ifj4$" resolve="a" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="dfChU1yMl4" role="3s_gse">
+        <property role="3s$Bm0" value="value_role" />
+        <node concept="3cqZAl" id="dfChU1yMl5" role="3clF45" />
+        <node concept="3Tm1VV" id="dfChU1yMl6" role="1B3o_S" />
+        <node concept="3clFbS" id="dfChU1yMl7" role="3clF47">
+          <node concept="3clFbH" id="dfChU1yMl8" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1yMl9" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1yMla" role="3cpWs9">
+              <property role="TrG5h" value="role" />
+              <node concept="26uTi9" id="dfChU1yMlb" role="1tU5fm" />
+              <node concept="2ShNRf" id="dfChU1yMlc" role="33vP2m">
+                <node concept="1pGfFk" id="dfChU1yMld" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$2Uu7" resolve="TreeLogical" />
+                  <node concept="1oi1Uc" id="dfChU1yMle" role="37wK5m">
+                    <node concept="1oi5Wm" id="dfChU1ySfn" role="1oi0x0">
+                      <property role="TrG5h" value="bar" />
+                      <node concept="1oi5XN" id="dfChU1ySfo" role="1oi5zu">
+                        <property role="1oi5yK" value="abc" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1yMli" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1yMlj" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1yMlk" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="dfChU1yMll" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1yMlm" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1yMln" role="1oi0x0">
+                  <node concept="1oi5Wm" id="dfChU1EoaL" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <node concept="1oi5XN" id="dfChU1EoaR" role="1oi5zu">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="dfChU1DQGr" role="1ojpOf">
+                    <property role="TrG5h" value="bar" />
+                    <node concept="1oi5XN" id="dfChU1DQGy" role="1oi5zu">
+                      <property role="1oi5yK" value="abc" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1yMls" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1yMlt" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1yMlu" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="dfChU1yMlv" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1yMlw" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1yMlx" role="1oi0x0">
+                  <node concept="1oi5Wm" id="1OShD0HA1G7" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <node concept="1oi5XN" id="1OShD0HA1G8" role="1oi5zu">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="dfChU1DQU1" role="1ojpOf">
+                    <property role="TrG5h" value="_" />
+                    <node concept="22Ky0T" id="dfChU1DQU6" role="lGtFl">
+                      <node concept="37vLTw" id="dfChU1DQUk" role="22Ky0K">
+                        <ref role="3cqZAo" node="dfChU1yMla" resolve="role" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1yMl_" role="3cqZAp" />
+          <node concept="3vlDli" id="dfChU1yMlA" role="3cqZAp">
+            <node concept="37vLTw" id="dfChU1yMlB" role="3tpDZA">
+              <ref role="3cqZAo" node="dfChU1yMlu" resolve="b" />
+            </node>
+            <node concept="37vLTw" id="dfChU1yMlC" role="3tpDZB">
+              <ref role="3cqZAo" node="dfChU1yMlk" resolve="a" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="dfChU1DQLg" role="3s_gse">
+        <property role="3s$Bm0" value="child_role" />
+        <node concept="3cqZAl" id="dfChU1DQLh" role="3clF45" />
+        <node concept="3Tm1VV" id="dfChU1DQLi" role="1B3o_S" />
+        <node concept="3clFbS" id="dfChU1DQLj" role="3clF47">
+          <node concept="3clFbH" id="dfChU1DQLk" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1DQLl" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1DQLm" role="3cpWs9">
+              <property role="TrG5h" value="role" />
+              <node concept="26uTi9" id="dfChU1DQLn" role="1tU5fm" />
+              <node concept="2ShNRf" id="dfChU1DQLo" role="33vP2m">
+                <node concept="1pGfFk" id="dfChU1DQLp" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$2Uu7" resolve="TreeLogical" />
+                  <node concept="1oi1Uc" id="dfChU1DQLq" role="37wK5m">
+                    <node concept="1oi5ST" id="dfChU1DQYI" role="1oi0x0">
+                      <property role="TrG5h" value="foo" />
+                      <node concept="1oi5UN" id="dfChU1DQYJ" role="1oi5TL" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1DQLt" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1DQLu" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1DQLv" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="dfChU1DQLw" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1DQLx" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1DQLy" role="1oi0x0">
+                  <node concept="1oi5ST" id="dfChU1DQYu" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <node concept="1oi5UN" id="dfChU1DQY$" role="1oi5TL" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1DQL_" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1DQLA" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1DQLB" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="dfChU1DQLC" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1DQLD" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1DQLE" role="1oi0x0">
+                  <node concept="1oi5ST" id="dfChU1DQLF" role="1ojpOf">
+                    <property role="TrG5h" value="_" />
+                    <node concept="22Ky0T" id="dfChU1DQLG" role="lGtFl">
+                      <node concept="37vLTw" id="dfChU1DQLH" role="22Ky0K">
+                        <ref role="3cqZAo" node="dfChU1DQLm" resolve="role" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1DQLI" role="3cqZAp" />
+          <node concept="3vlDli" id="dfChU1DQLJ" role="3cqZAp">
+            <node concept="37vLTw" id="dfChU1DQLK" role="3tpDZA">
+              <ref role="3cqZAo" node="dfChU1DQLB" resolve="b" />
+            </node>
+            <node concept="37vLTw" id="dfChU1DQLL" role="3tpDZB">
+              <ref role="3cqZAo" node="dfChU1DQLv" resolve="a" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="dfChU1EnU2" role="3s_gse">
+        <property role="3s$Bm0" value="value" />
+        <node concept="3cqZAl" id="dfChU1EnU3" role="3clF45" />
+        <node concept="3Tm1VV" id="dfChU1EnU4" role="1B3o_S" />
+        <node concept="3clFbS" id="dfChU1EnU5" role="3clF47">
+          <node concept="3clFbH" id="dfChU1EnU6" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1EnU7" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1EnU8" role="3cpWs9">
+              <property role="TrG5h" value="value" />
+              <node concept="26uTi9" id="dfChU1EnU9" role="1tU5fm" />
+              <node concept="2ShNRf" id="dfChU1EnUa" role="33vP2m">
+                <node concept="1pGfFk" id="dfChU1EnUb" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$2Uu7" resolve="TreeLogical" />
+                  <node concept="1oi1Uc" id="dfChU1EnUc" role="37wK5m">
+                    <node concept="1oi5XN" id="dfChU1Eo0f" role="1oi0x0">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1EnUf" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1EnUg" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1EnUh" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="dfChU1EnUi" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1EnUj" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1EnUk" role="1oi0x0">
+                  <node concept="1oi5Wm" id="dfChU1EnZH" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <node concept="1oi5XN" id="dfChU1EnZU" role="1oi5zu">
+                      <property role="1oi5yK" value="abcd" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="dfChU1EnZL" role="1ojpOf">
+                    <property role="TrG5h" value="bar" />
+                    <node concept="1oi5XN" id="dfChU1EnZR" role="1oi5zu">
+                      <property role="1oi5yK" value="xyz" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1EnUn" role="3cqZAp" />
+          <node concept="3cpWs8" id="dfChU1EnUo" role="3cqZAp">
+            <node concept="3cpWsn" id="dfChU1EnUp" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="dfChU1EnUq" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="dfChU1EnUr" role="33vP2m">
+                <node concept="1oi5UN" id="dfChU1Eopi" role="1oi0x0">
+                  <node concept="1oi5Wm" id="dfChU1Eopj" role="1ojpOf">
+                    <property role="TrG5h" value="foo" />
+                    <node concept="1oi5XN" id="dfChU1Eopk" role="1oi5zu">
+                      <property role="1oi5yK" value="abcd" />
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="dfChU1Eopl" role="1ojpOf">
+                    <property role="TrG5h" value="bar" />
+                    <node concept="1oi5XN" id="dfChU1EopN" role="1oi5zu">
+                      <property role="1oi5yK" value="_" />
+                      <node concept="22Ky0T" id="dfChU1EopP" role="lGtFl">
+                        <node concept="37vLTw" id="dfChU1Eoq3" role="22Ky0K">
+                          <ref role="3cqZAo" node="dfChU1EnU8" resolve="value" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="dfChU1EnUw" role="3cqZAp" />
+          <node concept="3vlDli" id="dfChU1EnUx" role="3cqZAp">
+            <node concept="37vLTw" id="dfChU1EnUy" role="3tpDZA">
+              <ref role="3cqZAo" node="dfChU1EnUp" resolve="b" />
+            </node>
+            <node concept="37vLTw" id="dfChU1EnUz" role="3tpDZB">
+              <ref role="3cqZAo" node="dfChU1EnUh" resolve="a" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+
diff --git a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
index c78d29a4..4d65e0a1 100644
--- a/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
+++ b/languages/jetbrains.mps.logic/test/models/jetbrains/mps/logic/test/unification.mps
@@ -12,6 +12,8 @@
     <import index="oy3s" ref="r:a6030cee-34eb-4503-b1bf-015fe5cd8c1a(jetbrains.mps.logic.builtin.unification)" />
     <import index="5j4j" ref="r:c8fb1c5e-8204-4904-a38f-678899d447c1(jetbrains.mps.logic.structure)" />
     <import index="ie8e" ref="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.unification.tree)" />
+    <import index="jfki" ref="7526e0cf-1ce7-46f8-a555-9eca1e06c23b/f:java_stub#7526e0cf-1ce7-46f8-a555-9eca1e06c23b#jetbrains.mps.unification(jetbrains.mps.unification.tree/jetbrains.mps.unification@java_stub)" />
+    <import index="yg8f" ref="r:e213377a-f1a7-4ba7-9d08-96bcb97ed8ce(jetbrains.mps.logic.builtin)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -34,6 +36,10 @@
       <concept id="1070475926800" name="jetbrains.mps.baseLanguage.structure.StringLiteral" flags="nn" index="Xl_RD">
         <property id="1070475926801" name="value" index="Xl_RC" />
       </concept>
+      <concept id="1070534934090" name="jetbrains.mps.baseLanguage.structure.CastExpression" flags="nn" index="10QFUN">
+        <child id="1070534934091" name="type" index="10QFUM" />
+        <child id="1070534934092" name="expression" index="10QFUP" />
+      </concept>
       <concept id="1068390468200" name="jetbrains.mps.baseLanguage.structure.FieldDeclaration" flags="ig" index="312cEg" />
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
         <child id="1068431790190" name="initializer" index="33vP2m" />
@@ -68,6 +74,9 @@
       </concept>
       <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
       <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
+      <concept id="1079359253375" name="jetbrains.mps.baseLanguage.structure.ParenthesizedExpression" flags="nn" index="1eOMI4">
+        <child id="1079359253376" name="expression" index="1eOMHV" />
+      </concept>
       <concept id="1204053956946" name="jetbrains.mps.baseLanguage.structure.IMethodCall" flags="ng" index="1ndlxa">
         <reference id="1068499141037" name="baseMethodDeclaration" index="37wK5l" />
         <child id="1068499141038" name="actualArgument" index="37wK5m" />
@@ -76,15 +85,19 @@
       <concept id="1107461130800" name="jetbrains.mps.baseLanguage.structure.Classifier" flags="ng" index="3pOWGL">
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
-      <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
       <concept id="7812454656619025412" name="jetbrains.mps.baseLanguage.structure.LocalMethodCall" flags="nn" index="1rXfSq" />
       <concept id="1107535904670" name="jetbrains.mps.baseLanguage.structure.ClassifierType" flags="in" index="3uibUv">
         <reference id="1107535924139" name="classifier" index="3uigEE" />
-        <child id="1109201940907" name="parameter" index="11_B2D" />
       </concept>
       <concept id="1178549954367" name="jetbrains.mps.baseLanguage.structure.IVisible" flags="ng" index="1B3ioH">
         <child id="1178549979242" name="visibility" index="1B3o_S" />
       </concept>
+      <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
+        <property id="6329021646629104958" name="text" index="3SKdUp" />
+      </concept>
+      <concept id="6329021646629104954" name="jetbrains.mps.baseLanguage.structure.SingleLineComment" flags="nn" index="3SKdUt">
+        <child id="6329021646629175155" name="commentPart" index="3SKWNk" />
+      </concept>
       <concept id="1146644602865" name="jetbrains.mps.baseLanguage.structure.PublicVisibility" flags="nn" index="3Tm1VV" />
       <concept id="1146644623116" name="jetbrains.mps.baseLanguage.structure.PrivateVisibility" flags="nn" index="3Tm6S6" />
     </language>
@@ -101,9 +114,14 @@
       <concept id="1171931858461" name="jetbrains.mps.baseLanguage.unitTest.structure.TestMethodList" flags="ng" index="3s_gsd">
         <child id="1171931858462" name="testMethod" index="3s_gse" />
       </concept>
+      <concept id="8427750732757990717" name="jetbrains.mps.baseLanguage.unitTest.structure.BinaryAssert" flags="nn" index="3tpDYu">
+        <child id="8427750732757990725" name="actual" index="3tpDZA" />
+        <child id="8427750732757990724" name="expected" index="3tpDZB" />
+      </concept>
       <concept id="1171981022339" name="jetbrains.mps.baseLanguage.unitTest.structure.AssertTrue" flags="nn" index="3vwNmj">
         <child id="1171981057159" name="condition" index="3vwVQn" />
       </concept>
+      <concept id="1171985735491" name="jetbrains.mps.baseLanguage.unitTest.structure.AssertSame" flags="nn" index="3vMLTj" />
       <concept id="8243879142738608185" name="jetbrains.mps.baseLanguage.unitTest.structure.BeforeTest" flags="in" index="1KhYhu" />
       <concept id="8243879142738613213" name="jetbrains.mps.baseLanguage.unitTest.structure.AfterTest" flags="in" index="1KhZuU" />
     </language>
@@ -111,6 +129,9 @@
       <concept id="4310122986197990603" name="jetbrains.mps.logic.structure.ExpressionNode" flags="ng" index="xgLVe">
         <child id="4310122986197991094" name="expression" index="xgLMN" />
       </concept>
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.ListNode" flags="ng" index="KCUsM">
+        <child id="2105510410850136264" name="contents" index="KCVpo" />
+      </concept>
       <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.Ast" flags="ng" index="1oi1Uc">
         <child id="7571593955706125526" name="root" index="1oi0x0" />
       </concept>
@@ -129,10 +150,6 @@
       <concept id="7571593955706137573" name="jetbrains.mps.logic.structure.ValueHolder" flags="ng" index="1oi5XN">
         <property id="7571593955706137638" name="value" index="1oi5yK" />
       </concept>
-      <concept id="7571593955706284481" name="jetbrains.mps.logic.structure.Symbol" flags="ng" index="1ojpPn" />
-      <concept id="1503029989441024" name="jetbrains.mps.logic.structure.AbstractNode" flags="ng" index="1KByzZ">
-        <child id="1503029989483908" name="symbol" index="1KAndV" />
-      </concept>
     </language>
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
@@ -164,24 +181,28 @@
         <property role="TrG5h" value="name" />
         <node concept="17QB3L" id="21Zu7ABuutu" role="1tU5fm" />
       </node>
-      <node concept="3uibUv" id="21Zu7ABuxwM" role="3clF45">
-        <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="ITreePart" />
-        <node concept="3qTvmN" id="21Zu7ABux$y" role="11_B2D" />
+      <node concept="3uibUv" id="1OShD0I14oi" role="3clF45">
+        <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
       </node>
-      <node concept="3Tm1VV" id="21Zu7ABuubY" role="1B3o_S" />
+      <node concept="3Tm6S6" id="1OShD0IfwAc" role="1B3o_S" />
       <node concept="3clFbS" id="21Zu7ABuubZ" role="3clF47">
         <node concept="3clFbF" id="21Zu7ABuuuo" role="3cqZAp">
-          <node concept="2OqwBi" id="21Zu7ABux0e" role="3clFbG">
-            <node concept="2ShNRf" id="21Zu7ABuuum" role="2Oq$k0">
-              <node concept="1pGfFk" id="21Zu7ABuv79" role="2ShVmc">
-                <ref role="37wK5l" to="oy3s:6SkxsM$96Z2" resolve="TreeLogical" />
-                <node concept="37vLTw" id="21Zu7ABuwhW" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABuute" resolve="name" />
+          <node concept="10QFUN" id="1OShD0I14HQ" role="3clFbG">
+            <node concept="2OqwBi" id="1OShD0I14HL" role="10QFUP">
+              <node concept="2ShNRf" id="1OShD0I14HM" role="2Oq$k0">
+                <node concept="1pGfFk" id="1OShD0I14HN" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$96Z2" resolve="TreeLogical" />
+                  <node concept="37vLTw" id="1OShD0I14HO" role="37wK5m">
+                    <ref role="3cqZAo" node="21Zu7ABuute" resolve="name" />
+                  </node>
                 </node>
               </node>
+              <node concept="liA8E" id="1OShD0I14HP" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="asTreePart" />
+              </node>
             </node>
-            <node concept="liA8E" id="21Zu7ABuxsp" role="2OqNvi">
-              <ref role="37wK5l" to="oy3s:1Ns6gpY6DeD" resolve="toTreePart" />
+            <node concept="3uibUv" id="1OShD0I14Nx" role="10QFUM">
+              <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
             </node>
           </node>
         </node>
@@ -190,34 +211,30 @@
     <node concept="3Tm1VV" id="5NuEpF1$W3O" role="1B3o_S" />
     <node concept="3s_gsd" id="5NuEpF1$W3P" role="3s_ewO">
       <node concept="3s$Bmu" id="fHk0tWulwY" role="3s_gse">
-        <property role="3s$Bm0" value="askUniEmpty" />
+        <property role="3s$Bm0" value="empty" />
         <node concept="3cqZAl" id="fHk0tWulx0" role="3clF45" />
         <node concept="3Tm1VV" id="fHk0tWulx2" role="1B3o_S" />
         <node concept="3clFbS" id="fHk0tWulx3" role="3clF47">
           <node concept="3clFbH" id="fHk0tWuxTG" role="3cqZAp" />
           <node concept="3cpWs8" id="fHk0tWu_Ms" role="3cqZAp">
             <node concept="3cpWsn" id="fHk0tWu_Mt" role="3cpWs9">
-              <property role="TrG5h" value="t1" />
+              <property role="TrG5h" value="a" />
               <node concept="3uibUv" id="fHk0tWu_Mu" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
               <node concept="1oi1Uc" id="fHk0tWuK3B" role="33vP2m">
-                <node concept="1oi5UN" id="fHk0tWuK7X" role="1oi0x0">
-                  <node concept="1ojpPn" id="fHk0tWuK80" role="1KAndV" />
-                </node>
+                <node concept="1oi5UN" id="fHk0tWuK7X" role="1oi0x0" />
               </node>
             </node>
           </node>
           <node concept="3cpWs8" id="fHk0tWuKa3" role="3cqZAp">
             <node concept="3cpWsn" id="fHk0tWuKa4" role="3cpWs9">
-              <property role="TrG5h" value="t2" />
+              <property role="TrG5h" value="b" />
               <node concept="3uibUv" id="fHk0tWuKa5" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
               <node concept="1oi1Uc" id="fHk0tWuKa6" role="33vP2m">
-                <node concept="1oi5UN" id="fHk0tWuKa7" role="1oi0x0">
-                  <node concept="1ojpPn" id="fHk0tWuKa8" role="1KAndV" />
-                </node>
+                <node concept="1oi5UN" id="fHk0tWuKa7" role="1oi0x0" />
               </node>
             </node>
           </node>
@@ -230,10 +247,10 @@
               <node concept="liA8E" id="fHk0tWuttq" role="2OqNvi">
                 <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
                 <node concept="37vLTw" id="fHk0tWuKfb" role="37wK5m">
-                  <ref role="3cqZAo" node="fHk0tWu_Mt" resolve="t1" />
+                  <ref role="3cqZAo" node="fHk0tWu_Mt" resolve="a" />
                 </node>
                 <node concept="37vLTw" id="fHk0tWuKiE" role="37wK5m">
-                  <ref role="3cqZAo" node="fHk0tWuKa4" resolve="t2" />
+                  <ref role="3cqZAo" node="fHk0tWuKa4" resolve="b" />
                 </node>
               </node>
             </node>
@@ -241,14 +258,14 @@
         </node>
       </node>
       <node concept="3s$Bmu" id="21Zu7ABuiLx" role="3s_gse">
-        <property role="3s$Bm0" value="askUniValue" />
+        <property role="3s$Bm0" value="value" />
         <node concept="3cqZAl" id="21Zu7ABuiLy" role="3clF45" />
         <node concept="3Tm1VV" id="21Zu7ABuiLz" role="1B3o_S" />
         <node concept="3clFbS" id="21Zu7ABuiL$" role="3clF47">
           <node concept="3clFbH" id="21Zu7ABuiL_" role="3cqZAp" />
           <node concept="3cpWs8" id="21Zu7ABuiLA" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABuiLB" role="3cpWs9">
-              <property role="TrG5h" value="t1" />
+              <property role="TrG5h" value="a" />
               <node concept="3uibUv" id="21Zu7ABuiLC" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -258,17 +275,15 @@
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABuj7y" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABuj7z" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABuiLF" role="1KAndV" />
                 </node>
               </node>
             </node>
           </node>
           <node concept="3cpWs8" id="21Zu7ABuiLG" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABuiLH" role="3cpWs9">
-              <property role="TrG5h" value="t2" />
+              <property role="TrG5h" value="b" />
               <node concept="3uibUv" id="21Zu7ABuiLI" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -278,10 +293,8 @@
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABun6$" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABun6_" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABun6A" role="1KAndV" />
                 </node>
               </node>
             </node>
@@ -295,10 +308,10 @@
               <node concept="liA8E" id="21Zu7ABuiLQ" role="2OqNvi">
                 <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
                 <node concept="37vLTw" id="21Zu7ABuiLR" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABuiLB" resolve="t1" />
+                  <ref role="3cqZAo" node="21Zu7ABuiLB" resolve="a" />
                 </node>
                 <node concept="37vLTw" id="21Zu7ABuiLS" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABuiLH" resolve="t2" />
+                  <ref role="3cqZAo" node="21Zu7ABuiLH" resolve="b" />
                 </node>
               </node>
             </node>
@@ -306,14 +319,14 @@
         </node>
       </node>
       <node concept="3s$Bmu" id="21Zu7ABunhH" role="3s_gse">
-        <property role="3s$Bm0" value="askUniVar" />
+        <property role="3s$Bm0" value="var" />
         <node concept="3cqZAl" id="21Zu7ABunhI" role="3clF45" />
         <node concept="3Tm1VV" id="21Zu7ABunhJ" role="1B3o_S" />
         <node concept="3clFbS" id="21Zu7ABunhK" role="3clF47">
           <node concept="3clFbH" id="21Zu7ABunhL" role="3cqZAp" />
           <node concept="3cpWs8" id="21Zu7ABunhM" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABunhN" role="3cpWs9">
-              <property role="TrG5h" value="t1" />
+              <property role="TrG5h" value="a" />
               <node concept="3uibUv" id="21Zu7ABunhO" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -329,24 +342,21 @@
                           <property role="Xl_RC" value="X" />
                         </node>
                       </node>
-                      <node concept="1ojpPn" id="21Zu7ABuxPt" role="1KAndV" />
                     </node>
                   </node>
                   <node concept="1oi5Wm" id="21Zu7ABunhR" role="1ojpOf">
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABunhS" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABunhT" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABunhU" role="1KAndV" />
                 </node>
               </node>
             </node>
           </node>
           <node concept="3cpWs8" id="21Zu7ABunhV" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABunhW" role="3cpWs9">
-              <property role="TrG5h" value="t2" />
+              <property role="TrG5h" value="b" />
               <node concept="3uibUv" id="21Zu7ABunhX" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -362,17 +372,14 @@
                           <property role="Xl_RC" value="Y" />
                         </node>
                       </node>
-                      <node concept="1ojpPn" id="21Zu7ABuxSx" role="1KAndV" />
                     </node>
                   </node>
                   <node concept="1oi5Wm" id="21Zu7ABuni0" role="1ojpOf">
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABuni1" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABuni2" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABuni3" role="1KAndV" />
                 </node>
               </node>
             </node>
@@ -386,10 +393,10 @@
               <node concept="liA8E" id="21Zu7ABuni8" role="2OqNvi">
                 <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
                 <node concept="37vLTw" id="21Zu7ABuni9" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABunhN" resolve="t1" />
+                  <ref role="3cqZAo" node="21Zu7ABunhN" resolve="a" />
                 </node>
                 <node concept="37vLTw" id="21Zu7ABunia" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABunhW" resolve="t2" />
+                  <ref role="3cqZAo" node="21Zu7ABunhW" resolve="b" />
                 </node>
               </node>
             </node>
@@ -397,14 +404,14 @@
         </node>
       </node>
       <node concept="3s$Bmu" id="21Zu7ABupTn" role="3s_gse">
-        <property role="3s$Bm0" value="askUniTermVar" />
+        <property role="3s$Bm0" value="term_var" />
         <node concept="3cqZAl" id="21Zu7ABupTo" role="3clF45" />
         <node concept="3Tm1VV" id="21Zu7ABupTp" role="1B3o_S" />
         <node concept="3clFbS" id="21Zu7ABupTq" role="3clF47">
           <node concept="3clFbH" id="21Zu7ABupTr" role="3cqZAp" />
           <node concept="3cpWs8" id="21Zu7ABupTs" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABupTt" role="3cpWs9">
-              <property role="TrG5h" value="t1" />
+              <property role="TrG5h" value="a" />
               <node concept="3uibUv" id="21Zu7ABupTu" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -418,27 +425,23 @@
                         <property role="TrG5h" value="name" />
                         <node concept="1oi5XN" id="21Zu7ABuqdR" role="1oi5zu">
                           <property role="1oi5yK" value="bar" />
-                          <node concept="1ojpPn" id="21Zu7ABuqdU" role="1KAndV" />
                         </node>
                       </node>
-                      <node concept="1ojpPn" id="21Zu7ABuqdG" role="1KAndV" />
                     </node>
                   </node>
                   <node concept="1oi5Wm" id="21Zu7ABupT$" role="1ojpOf">
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABupT_" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABupTA" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABupTB" role="1KAndV" />
                 </node>
               </node>
             </node>
           </node>
           <node concept="3cpWs8" id="21Zu7ABupTC" role="3cqZAp">
             <node concept="3cpWsn" id="21Zu7ABupTD" role="3cpWs9">
-              <property role="TrG5h" value="t2" />
+              <property role="TrG5h" value="b" />
               <node concept="3uibUv" id="21Zu7ABupTE" role="1tU5fm">
                 <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
               </node>
@@ -454,17 +457,14 @@
                           <property role="Xl_RC" value="X" />
                         </node>
                       </node>
-                      <node concept="1ojpPn" id="21Zu7ABuxYu" role="1KAndV" />
                     </node>
                   </node>
                   <node concept="1oi5Wm" id="21Zu7ABupTK" role="1ojpOf">
                     <property role="TrG5h" value="name" />
                     <node concept="1oi5XN" id="21Zu7ABupTL" role="1oi5zu">
                       <property role="1oi5yK" value="foo" />
-                      <node concept="1ojpPn" id="21Zu7ABupTM" role="1KAndV" />
                     </node>
                   </node>
-                  <node concept="1ojpPn" id="21Zu7ABupTN" role="1KAndV" />
                 </node>
               </node>
             </node>
@@ -478,10 +478,403 @@
               <node concept="liA8E" id="21Zu7ABupTS" role="2OqNvi">
                 <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
                 <node concept="37vLTw" id="21Zu7ABupTT" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABupTt" resolve="t1" />
+                  <ref role="3cqZAo" node="21Zu7ABupTt" resolve="a" />
                 </node>
                 <node concept="37vLTw" id="21Zu7ABupTU" role="37wK5m">
-                  <ref role="3cqZAo" node="21Zu7ABupTD" resolve="t2" />
+                  <ref role="3cqZAo" node="21Zu7ABupTD" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="1OShD0I0umi" role="3s_gse">
+        <property role="3s$Bm0" value="list" />
+        <node concept="3cqZAl" id="1OShD0I0umj" role="3clF45" />
+        <node concept="3Tm1VV" id="1OShD0I0umk" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0I0uml" role="3clF47">
+          <node concept="3clFbH" id="1OShD0I0umm" role="3cqZAp" />
+          <node concept="3cpWs8" id="1OShD0I0umn" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I0umo" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="1OShD0I0ump" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I0umq" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I0umr" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I0ums" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0I0uMG" role="1oi5TL">
+                      <node concept="1oi5UN" id="1OShD0I0umt" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I0umu" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I0umv" role="1oi5zu">
+                            <property role="1oi5yK" value="bar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="1oi5UN" id="1OShD0I0uNo" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I0uNp" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I0uNq" role="1oi5zu">
+                            <property role="1oi5yK" value="bazz" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I0umw" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I0umx" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="1OShD0I0umy" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I0umz" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1OShD0I0um$" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I0um_" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I0umA" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I0umB" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="xgLVe" id="1OShD0I0umC" role="1oi5TL">
+                      <node concept="1rXfSq" id="1OShD0I0umD" role="xgLMN">
+                        <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                        <node concept="Xl_RD" id="1OShD0I0umE" role="37wK5m">
+                          <property role="Xl_RC" value="X" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I0umF" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I0umG" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0I0umH" role="3cqZAp" />
+          <node concept="3vwNmj" id="1OShD0I0umI" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0I0umJ" role="3vwVQn">
+              <node concept="37vLTw" id="1OShD0I0umK" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0I0umL" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
+                <node concept="37vLTw" id="1OShD0I0umM" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I0umo" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="1OShD0I0umN" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I0umz" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="1OShD0I168J" role="3s_gse">
+        <property role="3s$Bm0" value="list_tail" />
+        <node concept="3cqZAl" id="1OShD0I168K" role="3clF45" />
+        <node concept="3Tm1VV" id="1OShD0I168L" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0I168M" role="3clF47">
+          <node concept="3clFbH" id="1OShD0I168N" role="3cqZAp" />
+          <node concept="3cpWs8" id="1OShD0I168O" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I168P" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="1OShD0I168Q" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I168R" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I168S" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I168T" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0I168U" role="1oi5TL">
+                      <node concept="1oi5UN" id="1OShD0I168V" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I168W" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I168X" role="1oi5zu">
+                            <property role="1oi5yK" value="bar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="1oi5UN" id="1OShD0I168Y" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I168Z" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I1690" role="1oi5zu">
+                            <property role="1oi5yK" value="bazz" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I1691" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I1692" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="1OShD0I16sv" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I16sw" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1OShD0I16sx" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I16sy" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I16sz" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I16s$" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0I16s_" role="1oi5TL">
+                      <node concept="1oi5UN" id="1OShD0I16sA" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I16sB" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I16sC" role="1oi5zu">
+                            <property role="1oi5yK" value="bar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="xgLVe" id="1OShD0I16xM" role="KCVpo">
+                        <node concept="1rXfSq" id="1OShD0I16xN" role="xgLMN">
+                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                          <node concept="Xl_RD" id="1OShD0I16xO" role="37wK5m">
+                            <property role="Xl_RC" value="X" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I16sG" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I16sH" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0I169e" role="3cqZAp" />
+          <node concept="3vwNmj" id="1OShD0I169f" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0I169g" role="3vwVQn">
+              <node concept="37vLTw" id="1OShD0I169h" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0I169i" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
+                <node concept="37vLTw" id="1OShD0I169j" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I168P" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="1OShD0I169k" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I16sw" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="1OShD0I1vD1" role="3s_gse">
+        <property role="3s$Bm0" value="list_tail_nil" />
+        <node concept="3cqZAl" id="1OShD0I1vD2" role="3clF45" />
+        <node concept="3Tm1VV" id="1OShD0I1vD3" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0I1vD4" role="3clF47">
+          <node concept="3clFbH" id="1OShD0I1vD5" role="3cqZAp" />
+          <node concept="3cpWs8" id="1OShD0I1vD6" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I1vD7" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="1OShD0I1vD8" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I1vD9" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I1vDa" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I1vDb" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0I1vDc" role="1oi5TL">
+                      <node concept="1oi5UN" id="1OShD0I1vDd" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I1vDe" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I1vDf" role="1oi5zu">
+                            <property role="1oi5yK" value="bar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="1oi5UN" id="1OShD0I1vDg" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I1vDh" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I1vDi" role="1oi5zu">
+                            <property role="1oi5yK" value="bazz" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I1vDj" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I1vDk" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="1OShD0I1vDl" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I1vDm" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1OShD0I1vDn" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0I1vDo" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0I1vDp" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0I1vDq" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0I1vDr" role="1oi5TL">
+                      <node concept="1oi5UN" id="1OShD0I1vDs" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I1vDt" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I1vDu" role="1oi5zu">
+                            <property role="1oi5yK" value="bar" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="1oi5UN" id="1OShD0I1yzr" role="KCVpo">
+                        <node concept="1oi5Wm" id="1OShD0I1yzs" role="1ojpOf">
+                          <property role="TrG5h" value="name" />
+                          <node concept="1oi5XN" id="1OShD0I1yzt" role="1oi5zu">
+                            <property role="1oi5yK" value="bazz" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="xgLVe" id="1OShD0I1vDv" role="KCVpo">
+                        <node concept="1rXfSq" id="1OShD0I1vDw" role="xgLMN">
+                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                          <node concept="Xl_RD" id="1OShD0I1vDx" role="37wK5m">
+                            <property role="Xl_RC" value="X" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0I1vDy" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0I1vDz" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0I1vD$" role="3cqZAp" />
+          <node concept="3vwNmj" id="1OShD0I1vD_" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0I1vDA" role="3vwVQn">
+              <node concept="37vLTw" id="1OShD0I1vDB" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0I1vDC" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
+                <node concept="37vLTw" id="1OShD0I1vDD" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I1vD7" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="1OShD0I1vDE" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I1vDm" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3s$Bmu" id="1OShD0If5u$" role="3s_gse">
+        <property role="3s$Bm0" value="list_nil" />
+        <node concept="3cqZAl" id="1OShD0If5u_" role="3clF45" />
+        <node concept="3Tm1VV" id="1OShD0If5uA" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0If5uB" role="3clF47">
+          <node concept="3clFbH" id="1OShD0If5uC" role="3cqZAp" />
+          <node concept="3cpWs8" id="1OShD0If5uD" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0If5uE" role="3cpWs9">
+              <property role="TrG5h" value="a" />
+              <node concept="3uibUv" id="1OShD0If5uF" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0If5uG" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0If5uH" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0If5uI" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0If5uJ" role="1oi5TL" />
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0If5uQ" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0If5uR" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWs8" id="1OShD0If5uS" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0If5uT" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1OShD0If5uU" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0If5uV" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0If5uW" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0If5uX" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0If5uY" role="1oi5TL">
+                      <node concept="xgLVe" id="1OShD0If5v5" role="KCVpo">
+                        <node concept="1rXfSq" id="1OShD0If5v6" role="xgLMN">
+                          <ref role="37wK5l" node="21Zu7ABuubV" resolve="var" />
+                          <node concept="Xl_RD" id="1OShD0If5v7" role="37wK5m">
+                            <property role="Xl_RC" value="X" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0If5v8" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0If5v9" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0If5va" role="3cqZAp" />
+          <node concept="3vwNmj" id="1OShD0If5vb" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0If5vc" role="3vwVQn">
+              <node concept="37vLTw" id="1OShD0If5vd" role="2Oq$k0">
+                <ref role="3cqZAo" node="fHk0tWuntB" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0If5ve" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
+                <node concept="37vLTw" id="1OShD0If5vf" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0If5uE" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="1OShD0If5vg" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0If5uT" resolve="b" />
                 </node>
               </node>
             </node>
@@ -537,5 +930,1296 @@
       <node concept="3clFbS" id="71LvIRuynfz" role="2VODD2" />
     </node>
   </node>
+  <node concept="3s_ewN" id="1OShD0IfsNp">
+    <property role="3s_ewP" value="TellUniSolver" />
+    <node concept="312cEg" id="1OShD0Ift_O" role="jymVt">
+      <property role="TrG5h" value="constraintSystem" />
+      <node concept="3Tm6S6" id="1OShD0Ift_P" role="1B3o_S" />
+      <node concept="3uibUv" id="1OShD0Ift_Q" role="1tU5fm">
+        <ref role="3uigEE" to="w2rx:~ConstraintSystem" resolve="ConstraintSystem" />
+      </node>
+    </node>
+    <node concept="312cEg" id="1OShD0Ift_R" role="jymVt">
+      <property role="TrG5h" value="unificationSolver" />
+      <node concept="3Tm6S6" id="1OShD0Ift_S" role="1B3o_S" />
+      <node concept="3uibUv" id="1OShD0Ift_T" role="1tU5fm">
+        <ref role="3uigEE" to="oy3s:6njqcfQVO0n" resolve="UnificationSolver" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1OShD0Ifu78" role="jymVt" />
+    <node concept="3clFb_" id="1OShD0Ifu8d" role="jymVt">
+      <property role="TrG5h" value="var" />
+      <node concept="37vLTG" id="1OShD0Ifu8e" role="3clF46">
+        <property role="TrG5h" value="name" />
+        <node concept="17QB3L" id="1OShD0Ifu8f" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="1OShD0Ifu8g" role="3clF45">
+        <ref role="3uigEE" to="ie8e:uNmovXiEd4" resolve="Variable" />
+      </node>
+      <node concept="3Tm6S6" id="1OShD0Ifwg0" role="1B3o_S" />
+      <node concept="3clFbS" id="1OShD0Ifu8i" role="3clF47">
+        <node concept="3clFbF" id="1OShD0Ifu8j" role="3cqZAp">
+          <node concept="10QFUN" id="1OShD0Ifu8k" role="3clFbG">
+            <node concept="2OqwBi" id="1OShD0Ifu8l" role="10QFUP">
+              <node concept="2ShNRf" id="1OShD0Ifu8m" role="2Oq$k0">
+                <node concept="1pGfFk" id="1OShD0Ifu8n" role="2ShVmc">
+                  <ref role="37wK5l" to="oy3s:6SkxsM$96Z2" resolve="TreeLogical" />
+                  <node concept="37vLTw" id="1OShD0Ifu8o" role="37wK5m">
+                    <ref role="3cqZAo" node="1OShD0Ifu8e" resolve="name" />
+                  </node>
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+          </node>
+          <node concept="3cpWs8" id="1OShD0Igi9t" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0Igi9u" role="3cpWs9">
+              <property role="TrG5h" value="b" />
+              <node concept="3uibUv" id="1OShD0Igi9v" role="1tU5fm">
+                <ref role="3uigEE" to="ie8e:2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="1oi1Uc" id="1OShD0Igi9w" role="33vP2m">
+                <node concept="1oi5UN" id="1OShD0Igi9x" role="1oi0x0">
+                  <node concept="1oi5ST" id="1OShD0Igi9y" role="1ojpOf">
+                    <property role="TrG5h" value="child" />
+                    <property role="1oi5Z2" value="single" />
+                    <node concept="KCUsM" id="1OShD0Igi9z" role="1oi5TL">
+                      <node concept="xgLVe" id="1OShD0Igi9$" role="KCVpo">
+                        <node concept="37vLTw" id="1OShD0IgiMg" role="xgLMN">
+                          <ref role="3cqZAo" node="1OShD0IgiMd" resolve="x" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1oi5Wm" id="1OShD0Igi9B" role="1ojpOf">
+                    <property role="TrG5h" value="name" />
+                    <node concept="1oi5XN" id="1OShD0Igi9C" role="1oi5zu">
+                      <property role="1oi5yK" value="foo" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0Igj1r" role="3cqZAp" />
+          <node concept="3clFbF" id="1OShD0IgiRF" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0IgiRG" role="3clFbG">
+              <node concept="37vLTw" id="1OShD0IgiRH" role="2Oq$k0">
+                <ref role="3cqZAo" node="1OShD0Ift_R" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0IgiRI" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAlI6" resolve="tellUni" />
+                <node concept="37vLTw" id="1OShD0IgiRJ" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0Igi9l" resolve="a" />
+                </node>
+                <node concept="37vLTw" id="1OShD0IgiRK" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0Igi9u" resolve="b" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0IgiRL" role="3cqZAp" />
+          <node concept="3SKdUt" id="1OShD0IgiRM" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0IgiRN" role="3SKWNk">
+              <property role="3SKdUp" value="variable in the last position matches the _list_" />
+            </node>
+          </node>
+          <node concept="3clFbH" id="1OShD0IgiRZ" role="3cqZAp" />
+          <node concept="3vwNmj" id="1OShD0IgiS0" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0IgiS1" role="3vwVQn">
+              <node concept="37vLTw" id="1OShD0IgiS2" role="2Oq$k0">
+                <ref role="3cqZAo" node="1OShD0Ift_R" resolve="unificationSolver" />
+              </node>
+              <node concept="liA8E" id="1OShD0IgiS3" role="2OqNvi">
+                <ref role="37wK5l" to="oy3s:4OsiK2BAnTP" resolve="askUni" />
+                <node concept="1oi1Uc" id="1OShD0IgnvY" role="37wK5m">
+                  <node concept="KCUsM" id="1OShD0IgnvZ" role="1oi0x0" />
+                </node>
+                <node concept="1oi1Uc" id="1OShD0IgnB0" role="37wK5m">
+                  <node concept="xgLVe" id="1OShD0IgnB1" role="1oi0x0">
+                    <node concept="37vLTw" id="1OShD0IgnB2" role="xgLMN">
+                      <ref role="3cqZAo" node="1OShD0IgiMd" resolve="x" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="1KhYhu" id="1OShD0IftNv" role="1KhZu4">
+      <node concept="3clFbS" id="1OShD0IftNw" role="2VODD2">
+        <node concept="3clFbF" id="1OShD0IftOp" role="3cqZAp">
+          <node concept="37vLTI" id="1OShD0IftOq" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0IftOr" role="37vLTJ">
+              <ref role="3cqZAo" node="1OShD0Ift_O" resolve="constraintSystem" />
+            </node>
+            <node concept="2ShNRf" id="1OShD0IftOs" role="37vLTx">
+              <node concept="1pGfFk" id="1OShD0IftOt" role="2ShVmc">
+                <ref role="37wK5l" to="w2rx:~ConstraintSystem.&lt;init&gt;()" resolve="ConstraintSystem" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0IftOu" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0IftOv" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0IftOw" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0Ift_O" resolve="constraintSystem" />
+            </node>
+            <node concept="liA8E" id="1OShD0IftOx" role="2OqNvi">
+              <ref role="37wK5l" to="w2rx:~ConstraintSystem.setQueuing(boolean):void" resolve="setQueuing" />
+              <node concept="3clFbT" id="1OShD0IftOy" role="37wK5m">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0IftOz" role="3cqZAp">
+          <node concept="37vLTI" id="1OShD0IftO$" role="3clFbG">
+            <node concept="2ShNRf" id="1OShD0IftO_" role="37vLTx">
+              <node concept="1pGfFk" id="1OShD0IftOA" role="2ShVmc">
+                <ref role="37wK5l" to="oy3s:4U_yxogDEZX" resolve="UnificationSolverImpl" />
+                <node concept="37vLTw" id="1OShD0IftOB" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0Ift_O" resolve="constraintSystem" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="1OShD0IftOC" role="37vLTJ">
+              <ref role="3cqZAo" node="1OShD0Ift_R" resolve="unificationSolver" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/solutions/jetbrains.mps.typechecking.handling/models/jetbrains/mps/typechecking/handler/producer.mps b/solutions/jetbrains.mps.typechecking.handling/models/jetbrains/mps/typechecking/handler/producer.mps
index 704d3939..5faa6409 100644
--- a/solutions/jetbrains.mps.typechecking.handling/models/jetbrains/mps/typechecking/handler/producer.mps
+++ b/solutions/jetbrains.mps.typechecking.handling/models/jetbrains/mps/typechecking/handler/producer.mps
@@ -3401,7 +3401,7 @@
           <property role="TrG5h" value="children" />
           <node concept="10Q1$e" id="4sVJFklM5Pv" role="1tU5fm">
             <node concept="3uibUv" id="4sVJFklM5Pw" role="10Q1$1">
-              <ref role="3uigEE" to="ie8e:1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="4sVJFklM5Px" role="11_B2D" />
             </node>
           </node>
diff --git a/solutions/jetbrains.mps.unification.tree/models/jetbrains/mps/unification/tree.mps b/solutions/jetbrains.mps.unification.tree/models/jetbrains/mps/unification/tree.mps
index b2322eed..373ad716 100644
--- a/solutions/jetbrains.mps.unification.tree/models/jetbrains/mps/unification/tree.mps
+++ b/solutions/jetbrains.mps.unification.tree/models/jetbrains/mps/unification/tree.mps
@@ -16,6 +16,7 @@
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1080223426719" name="jetbrains.mps.baseLanguage.structure.OrExpression" flags="nn" index="22lmx$" />
       <concept id="1219920932475" name="jetbrains.mps.baseLanguage.structure.VariableArityType" flags="in" index="8X2XB">
         <child id="1219921048460" name="componentType" index="8Xvag" />
       </concept>
@@ -176,6 +177,7 @@
       <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
       </concept>
+      <concept id="1068581242869" name="jetbrains.mps.baseLanguage.structure.MinusExpression" flags="nn" index="3cpWsd" />
       <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
       <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
       <concept id="1206060495898" name="jetbrains.mps.baseLanguage.structure.ElsifClause" flags="ng" index="3eNFk2">
@@ -199,7 +201,6 @@
         <child id="1068499141038" name="actualArgument" index="37wK5m" />
         <child id="4972241301747169160" name="typeArgument" index="3PaCim" />
       </concept>
-      <concept id="1073063089578" name="jetbrains.mps.baseLanguage.structure.SuperMethodCall" flags="nn" index="3nyPlj" />
       <concept id="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk">
         <child id="1212687122400" name="typeParameter" index="1pMfVU" />
       </concept>
@@ -427,6 +428,210 @@
     </node>
     <node concept="2tJIrI" id="5JQSuNsxMDx" role="jymVt" />
     <node concept="3Tm1VV" id="2xQ7eRABXh5" role="1B3o_S" />
+    <node concept="3clFb_" id="1mP5b6jQkcT" role="jymVt">
+      <property role="TrG5h" value="equals" />
+      <node concept="10P_77" id="1mP5b6jQkcU" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQkcV" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQkcW" role="3clF47">
+        <node concept="3clFbJ" id="1mP5b6jQkcX" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQkcY" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQkcZ" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQkd0" role="3cqZAk">
+                <property role="3clFbU" value="true" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="1mP5b6jQkd1" role="3clFbw">
+            <node concept="Xjq3P" id="1mP5b6jQkcS" role="3uHU7B" />
+            <node concept="37vLTw" id="1mP5b6jQkd2" role="3uHU7w">
+              <ref role="3cqZAo" node="1mP5b6jQkdp" resolve="o" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jQkd3" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQkd4" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQkd5" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQkd6" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="22lmx$" id="1mP5b6jQkd7" role="3clFbw">
+            <node concept="3clFbC" id="1mP5b6jQkd8" role="3uHU7B">
+              <node concept="37vLTw" id="1mP5b6jQkd9" role="3uHU7B">
+                <ref role="3cqZAo" node="1mP5b6jQkdp" resolve="o" />
+              </node>
+              <node concept="10Nm6u" id="1mP5b6jQkda" role="3uHU7w" />
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQkdb" role="3uHU7w">
+              <node concept="2OqwBi" id="1mP5b6jQkdc" role="3uHU7B">
+                <node concept="Xjq3P" id="1mP5b6jQkdd" role="2Oq$k0" />
+                <node concept="liA8E" id="1mP5b6jQkde" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+              <node concept="2OqwBi" id="1mP5b6jQkdf" role="3uHU7w">
+                <node concept="37vLTw" id="1mP5b6jQkdg" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jQkdp" resolve="o" />
+                </node>
+                <node concept="liA8E" id="1mP5b6jQkdh" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jQkdi" role="3cqZAp" />
+        <node concept="3cpWs8" id="1mP5b6jQkdj" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jQkdk" role="3cpWs9">
+            <property role="TrG5h" value="that" />
+            <node concept="3uibUv" id="1mP5b6jQkdl" role="1tU5fm">
+              <ref role="3uigEE" node="2xQ7eRABXh4" resolve="Tree" />
+            </node>
+            <node concept="10QFUN" id="1mP5b6jQkdm" role="33vP2m">
+              <node concept="3uibUv" id="1mP5b6jQkdn" role="10QFUM">
+                <ref role="3uigEE" node="2xQ7eRABXh4" resolve="Tree" />
+              </node>
+              <node concept="37vLTw" id="1mP5b6jQkdo" role="10QFUP">
+                <ref role="3cqZAo" node="1mP5b6jQkdp" resolve="o" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jQkdz" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQkd$" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQkd_" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQkdA" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="3K4zz7" id="1mP5b6jQkdB" role="3clFbw">
+            <node concept="3fqX7Q" id="1mP5b6jQkdC" role="3K4E3e">
+              <node concept="2OqwBi" id="1mP5b6jQkdD" role="3fr31v">
+                <node concept="liA8E" id="1mP5b6jQkdE" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+                  <node concept="2OqwBi" id="1mP5b6jQkdF" role="37wK5m">
+                    <node concept="37vLTw" id="1mP5b6jQkds" role="2Oq$k0">
+                      <ref role="3cqZAo" node="1mP5b6jQkdk" resolve="that" />
+                    </node>
+                    <node concept="2OwXpG" id="1mP5b6jQkdv" role="2OqNvi">
+                      <ref role="2Oxat5" node="5JQSuNsxMAD" resolve="root" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="37vLTw" id="1mP5b6jQkdw" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5JQSuNsxMAD" resolve="root" />
+                </node>
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQkdG" role="3K4Cdx">
+              <node concept="10Nm6u" id="1mP5b6jQkdH" role="3uHU7w" />
+              <node concept="37vLTw" id="1mP5b6jQkdx" role="3uHU7B">
+                <ref role="3cqZAo" node="5JQSuNsxMAD" resolve="root" />
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQkdI" role="3K4GZi">
+              <node concept="10Nm6u" id="1mP5b6jQkdJ" role="3uHU7w" />
+              <node concept="2OqwBi" id="1mP5b6jQkdK" role="3uHU7B">
+                <node concept="37vLTw" id="1mP5b6jQkdL" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jQkdk" resolve="that" />
+                </node>
+                <node concept="2OwXpG" id="1mP5b6jQkdy" role="2OqNvi">
+                  <ref role="2Oxat5" node="5JQSuNsxMAD" resolve="root" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jQkdM" role="3cqZAp" />
+        <node concept="3clFbF" id="1mP5b6jQkdN" role="3cqZAp">
+          <node concept="3clFbT" id="1mP5b6jQkdO" role="3clFbG">
+            <property role="3clFbU" value="true" />
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="1mP5b6jQkdp" role="3clF46">
+        <property role="TrG5h" value="o" />
+        <node concept="3uibUv" id="1mP5b6jQkdq" role="1tU5fm">
+          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQkdr" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQnun" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQkdP" role="jymVt">
+      <property role="TrG5h" value="hashCode" />
+      <node concept="10Oyi0" id="1mP5b6jQkdQ" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQkdR" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQkdS" role="3clF47">
+        <node concept="3cpWs8" id="1mP5b6jQkdU" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jQkdV" role="3cpWs9">
+            <property role="TrG5h" value="result" />
+            <node concept="10Oyi0" id="1mP5b6jQkdW" role="1tU5fm" />
+            <node concept="3cmrfG" id="1mP5b6jQkdX" role="33vP2m">
+              <property role="3cmrfH" value="47" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1mP5b6jQke7" role="3cqZAp">
+          <node concept="37vLTI" id="1mP5b6jQke8" role="3clFbG">
+            <node concept="3cpWs3" id="1mP5b6jQke9" role="37vLTx">
+              <node concept="1eOMI4" id="1mP5b6jQkea" role="3uHU7w">
+                <node concept="3K4zz7" id="1mP5b6jQkeb" role="1eOMHV">
+                  <node concept="3cmrfG" id="1mP5b6jQkec" role="3K4GZi">
+                    <property role="3cmrfH" value="0" />
+                  </node>
+                  <node concept="3y3z36" id="1mP5b6jQked" role="3K4Cdx">
+                    <node concept="10Nm6u" id="1mP5b6jQkee" role="3uHU7w" />
+                    <node concept="37vLTw" id="1mP5b6jQke5" role="3uHU7B">
+                      <ref role="3cqZAo" node="5JQSuNsxMAD" resolve="root" />
+                    </node>
+                  </node>
+                  <node concept="2OqwBi" id="1mP5b6jQkef" role="3K4E3e">
+                    <node concept="1eOMI4" id="1mP5b6jQkeg" role="2Oq$k0">
+                      <node concept="10QFUN" id="1mP5b6jQkeh" role="1eOMHV">
+                        <node concept="3uibUv" id="1mP5b6jQkei" role="10QFUM">
+                          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+                        </node>
+                        <node concept="37vLTw" id="1mP5b6jQke6" role="10QFUP">
+                          <ref role="3cqZAo" node="5JQSuNsxMAD" resolve="root" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="1mP5b6jQkej" role="2OqNvi">
+                      <ref role="37wK5l" to="e2lb:~Object.hashCode():int" resolve="hashCode" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="17qRlL" id="1mP5b6jQke3" role="3uHU7B">
+                <node concept="3cmrfG" id="1mP5b6jQke4" role="3uHU7B">
+                  <property role="3cmrfH" value="53" />
+                </node>
+                <node concept="37vLTw" id="1mP5b6jQkdY" role="3uHU7w">
+                  <ref role="3cqZAo" node="1mP5b6jQkdV" resolve="result" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="1mP5b6jQkek" role="37vLTJ">
+              <ref role="3cqZAo" node="1mP5b6jQkdV" resolve="result" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1mP5b6jQkel" role="3cqZAp">
+          <node concept="37vLTw" id="1mP5b6jQkem" role="3clFbG">
+            <ref role="3cqZAo" node="1mP5b6jQkdV" resolve="result" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQkdT" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQoc0" role="jymVt" />
     <node concept="312cEg" id="5JQSuNsxMAD" role="jymVt">
       <property role="TrG5h" value="root" />
       <node concept="3Tm6S6" id="5JQSuNsxMAE" role="1B3o_S" />
@@ -696,6 +901,30 @@
         <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
       </node>
     </node>
+    <node concept="2tJIrI" id="dfChU1lUXr" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1lVFI" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="attached" />
+      <node concept="37vLTG" id="dfChU1lVFJ" role="3clF46">
+        <property role="TrG5h" value="parent" />
+        <node concept="3uibUv" id="dfChU1lVFK" role="1tU5fm">
+          <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+          <node concept="3qTvmN" id="dfChU1lVFL" role="11_B2D" />
+        </node>
+      </node>
+      <node concept="3cqZAl" id="dfChU1lVFM" role="3clF45" />
+      <node concept="3Tm1VV" id="dfChU1lVFN" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1lVFQ" role="3clF47">
+        <node concept="3SKdUt" id="dfChU1lY6U" role="3cqZAp">
+          <node concept="3SKdUq" id="dfChU1lY6W" role="3SKWNk">
+            <property role="3SKdUp" value="do nothing" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="dfChU1lXoj" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
     <node concept="2tJIrI" id="2QE4RCGnhB7" role="jymVt" />
     <node concept="3clFb_" id="104EUzFOQG8" role="jymVt">
       <property role="1EzhhJ" value="false" />
@@ -752,13 +981,6 @@
     </node>
     <node concept="2tJIrI" id="5JQSuNs$ckc" role="jymVt" />
     <node concept="3Tm1VV" id="2xQ7eRAD2dk" role="1B3o_S" />
-    <node concept="312cEg" id="1msb0mq8QXA" role="jymVt">
-      <property role="TrG5h" value="symbol" />
-      <node concept="3Tm6S6" id="1msb0mq8QXB" role="1B3o_S" />
-      <node concept="16syzq" id="1msb0mq99yc" role="1tU5fm">
-        <ref role="16sUi3" node="1msb0mq99pI" resolve="V" />
-      </node>
-    </node>
     <node concept="16euLQ" id="1msb0mq99pI" role="16eVyc">
       <property role="TrG5h" value="V" />
     </node>
@@ -771,6 +993,224 @@
         <ref role="3uigEE" to="jfki:~Term" resolve="Term" />
       </node>
     </node>
+    <node concept="3clFb_" id="1mP5b6jQ__L" role="jymVt">
+      <property role="TrG5h" value="equals" />
+      <node concept="10P_77" id="1mP5b6jQ__M" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQ__N" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQ__O" role="3clF47">
+        <node concept="3clFbJ" id="1mP5b6jQ__P" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQ__Q" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQ__R" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQ__S" role="3cqZAk">
+                <property role="3clFbU" value="true" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="1mP5b6jQ__T" role="3clFbw">
+            <node concept="Xjq3P" id="1mP5b6jQ__K" role="3uHU7B" />
+            <node concept="37vLTw" id="1mP5b6jQ__U" role="3uHU7w">
+              <ref role="3cqZAo" node="1mP5b6jQ_Ah" resolve="o" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jQ__V" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQ__W" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQ__X" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQ__Y" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="22lmx$" id="1mP5b6jQ__Z" role="3clFbw">
+            <node concept="3clFbC" id="1mP5b6jQ_A0" role="3uHU7B">
+              <node concept="37vLTw" id="1mP5b6jQ_A1" role="3uHU7B">
+                <ref role="3cqZAo" node="1mP5b6jQ_Ah" resolve="o" />
+              </node>
+              <node concept="10Nm6u" id="1mP5b6jQ_A2" role="3uHU7w" />
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQ_A3" role="3uHU7w">
+              <node concept="2OqwBi" id="1mP5b6jQ_A4" role="3uHU7B">
+                <node concept="Xjq3P" id="1mP5b6jQ_A5" role="2Oq$k0" />
+                <node concept="liA8E" id="1mP5b6jQ_A6" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+              <node concept="2OqwBi" id="1mP5b6jQ_A7" role="3uHU7w">
+                <node concept="37vLTw" id="1mP5b6jQ_A8" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jQ_Ah" resolve="o" />
+                </node>
+                <node concept="liA8E" id="1mP5b6jQ_A9" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jQ_Aa" role="3cqZAp" />
+        <node concept="3cpWs8" id="1mP5b6jQ_Ab" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jQ_Ac" role="3cpWs9">
+            <property role="TrG5h" value="that" />
+            <node concept="3uibUv" id="1mP5b6jQ_Ad" role="1tU5fm">
+              <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
+            </node>
+            <node concept="10QFUN" id="1mP5b6jQ_Ae" role="33vP2m">
+              <node concept="3uibUv" id="1mP5b6jQ_Af" role="10QFUM">
+                <ref role="3uigEE" node="2xQ7eRAD2dj" resolve="Value" />
+              </node>
+              <node concept="37vLTw" id="1mP5b6jQ_Ag" role="10QFUP">
+                <ref role="3cqZAo" node="1mP5b6jQ_Ah" resolve="o" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jQ_Ar" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jQ_As" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jQ_At" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jQ_Au" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="3K4zz7" id="1mP5b6jQ_Av" role="3clFbw">
+            <node concept="3fqX7Q" id="1mP5b6jQ_Aw" role="3K4E3e">
+              <node concept="2OqwBi" id="1mP5b6jQ_Ax" role="3fr31v">
+                <node concept="liA8E" id="1mP5b6jQ_Ay" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.equals(java.lang.Object):boolean" resolve="equals" />
+                  <node concept="2OqwBi" id="1mP5b6jQ_Az" role="37wK5m">
+                    <node concept="37vLTw" id="1mP5b6jQ_Ak" role="2Oq$k0">
+                      <ref role="3cqZAo" node="1mP5b6jQ_Ac" resolve="that" />
+                    </node>
+                    <node concept="2OwXpG" id="1mP5b6jQ_An" role="2OqNvi">
+                      <ref role="2Oxat5" node="1msb0mq8QXA" resolve="symbol" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="1eOMI4" id="1mP5b6jQ_A$" role="2Oq$k0">
+                  <node concept="10QFUN" id="1mP5b6jQ_A_" role="1eOMHV">
+                    <node concept="3uibUv" id="1mP5b6jQ_AA" role="10QFUM">
+                      <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+                    </node>
+                    <node concept="37vLTw" id="1mP5b6jQ_Ao" role="10QFUP">
+                      <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQ_AB" role="3K4Cdx">
+              <node concept="10Nm6u" id="1mP5b6jQ_AC" role="3uHU7w" />
+              <node concept="37vLTw" id="1mP5b6jQ_Ap" role="3uHU7B">
+                <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jQ_AD" role="3K4GZi">
+              <node concept="10Nm6u" id="1mP5b6jQ_AE" role="3uHU7w" />
+              <node concept="2OqwBi" id="1mP5b6jQ_AF" role="3uHU7B">
+                <node concept="37vLTw" id="1mP5b6jQ_AG" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jQ_Ac" resolve="that" />
+                </node>
+                <node concept="2OwXpG" id="1mP5b6jQ_Aq" role="2OqNvi">
+                  <ref role="2Oxat5" node="1msb0mq8QXA" resolve="symbol" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jQ_AH" role="3cqZAp" />
+        <node concept="3clFbF" id="1mP5b6jQ_AI" role="3cqZAp">
+          <node concept="3clFbT" id="1mP5b6jQ_AJ" role="3clFbG">
+            <property role="3clFbU" value="true" />
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="1mP5b6jQ_Ah" role="3clF46">
+        <property role="TrG5h" value="o" />
+        <node concept="3uibUv" id="1mP5b6jQ_Ai" role="1tU5fm">
+          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQ_Aj" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQCee" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jQ_AK" role="jymVt">
+      <property role="TrG5h" value="hashCode" />
+      <node concept="10Oyi0" id="1mP5b6jQ_AL" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jQ_AM" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jQ_AN" role="3clF47">
+        <node concept="3cpWs8" id="1mP5b6jQ_AP" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jQ_AQ" role="3cpWs9">
+            <property role="TrG5h" value="result" />
+            <node concept="10Oyi0" id="1mP5b6jQ_AR" role="1tU5fm" />
+            <node concept="3cmrfG" id="1mP5b6jQ_AS" role="33vP2m">
+              <property role="3cmrfH" value="59" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1mP5b6jQ_B2" role="3cqZAp">
+          <node concept="37vLTI" id="1mP5b6jQ_B3" role="3clFbG">
+            <node concept="3cpWs3" id="1mP5b6jQ_B4" role="37vLTx">
+              <node concept="1eOMI4" id="1mP5b6jQ_B5" role="3uHU7w">
+                <node concept="3K4zz7" id="1mP5b6jQ_B6" role="1eOMHV">
+                  <node concept="3cmrfG" id="1mP5b6jQ_B7" role="3K4GZi">
+                    <property role="3cmrfH" value="0" />
+                  </node>
+                  <node concept="3y3z36" id="1mP5b6jQ_B8" role="3K4Cdx">
+                    <node concept="10Nm6u" id="1mP5b6jQ_B9" role="3uHU7w" />
+                    <node concept="37vLTw" id="1mP5b6jQ_B0" role="3uHU7B">
+                      <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+                    </node>
+                  </node>
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+                        <node concept="3uibUv" id="1mP5b6jQ_Bd" role="10QFUM">
+                          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+                        </node>
+                        <node concept="37vLTw" id="1mP5b6jQ_B1" role="10QFUP">
+                          <ref role="3cqZAo" node="1msb0mq8QXA" resolve="symbol" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="1mP5b6jQ_Be" role="2OqNvi">
+                      <ref role="37wK5l" to="e2lb:~Object.hashCode():int" resolve="hashCode" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="17qRlL" id="1mP5b6jQ_AY" role="3uHU7B">
+                <node concept="37vLTw" id="1mP5b6jQ_AT" role="3uHU7w">
+                  <ref role="3cqZAo" node="1mP5b6jQ_AQ" resolve="result" />
+                </node>
+                <node concept="3cmrfG" id="1mP5b6jQF4G" role="3uHU7B">
+                  <property role="3cmrfH" value="67" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="1mP5b6jQ_Bf" role="37vLTJ">
+              <ref role="3cqZAo" node="1mP5b6jQ_AQ" resolve="result" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1mP5b6jQ_Bg" role="3cqZAp">
+          <node concept="37vLTw" id="1mP5b6jQ_Bh" role="3clFbG">
+            <ref role="3cqZAo" node="1mP5b6jQ_AQ" resolve="result" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jQ_AO" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1mP5b6jQBud" role="jymVt" />
+    <node concept="312cEg" id="1msb0mq8QXA" role="jymVt">
+      <property role="TrG5h" value="symbol" />
+      <node concept="3Tm6S6" id="1msb0mq8QXB" role="1B3o_S" />
+      <node concept="16syzq" id="1msb0mq99yc" role="1tU5fm">
+        <ref role="16sUi3" node="1msb0mq99pI" resolve="V" />
+      </node>
+    </node>
   </node>
   <node concept="312cEu" id="1msb0mq99GH">
     <property role="TrG5h" value="ValuesBranch" />
@@ -879,13 +1319,8 @@
           <node concept="2YIFZM" id="1bm7a6EXU99" role="3clFbG">
             <ref role="37wK5l" node="5JQSuNsx5Sv" resolve="create" />
             <ref role="1Pybhc" node="1msb0mq99GH" resolve="ValuesBranch" />
-            <node concept="2OqwBi" id="1bm7a6EXUSD" role="37wK5m">
-              <node concept="1rXfSq" id="1bm7a6EXUSE" role="2Oq$k0">
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-              <node concept="liA8E" id="1bm7a6EXUSF" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HF7nU" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
             <node concept="1rXfSq" id="1bm7a6EXUSG" role="37wK5m">
               <ref role="37wK5l" node="1bm7a6EXK6a" resolve="childrenArr" />
@@ -999,13 +1434,8 @@
           <node concept="2YIFZM" id="3OPtF02UiXe" role="3clFbG">
             <ref role="37wK5l" node="5JQSuNsx5Sv" resolve="create" />
             <ref role="1Pybhc" node="1msb0mq99GH" resolve="ValuesBranch" />
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-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HF70Q" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
             <node concept="37vLTw" id="3OPtF02Uldh" role="37wK5m">
               <ref role="3cqZAo" node="3OPtF02U4Ca" resolve="values" />
@@ -1084,13 +1514,8 @@
                 <node concept="2YIFZM" id="2q_78a93qse" role="37wK5m">
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-                      <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                    </node>
+                  <node concept="1rXfSq" id="1OShD0HF7Km" role="37wK5m">
+                    <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
                   </node>
                 </node>
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@@ -1447,12 +1872,12 @@
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             <node concept="liA8E" id="2QE4RCGoeKd" role="2OqNvi">
               <ref role="37wK5l" node="2QE4RCGoaTQ" resolve="isRoot" />
             </node>
+            <node concept="37vLTw" id="1OShD0HBYdl" role="2Oq$k0">
+              <ref role="3cqZAo" node="1R$Cm9qGTDj" resolve="symbolPath" />
+            </node>
           </node>
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@@ -1472,11 +1897,48 @@
       </node>
     </node>
     <node concept="2tJIrI" id="2QE4RCGnBiQ" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1lNtX" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="attached" />
+      <node concept="37vLTG" id="dfChU1lNtY" role="3clF46">
+        <property role="TrG5h" value="parent" />
+        <node concept="3uibUv" id="dfChU1lNtZ" role="1tU5fm">
+          <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+          <node concept="3qTvmN" id="dfChU1lNu0" role="11_B2D" />
+        </node>
+      </node>
+      <node concept="3cqZAl" id="dfChU1lNu1" role="3clF45" />
+      <node concept="3Tm1VV" id="dfChU1lNu2" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1lNu5" role="3clF47">
+        <node concept="3clFbF" id="dfChU1lQmZ" role="3cqZAp">
+          <node concept="2OqwBi" id="dfChU1lQo0" role="3clFbG">
+            <node concept="liA8E" id="dfChU1lQzS" role="2OqNvi">
+              <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
+              <node concept="2OqwBi" id="dfChU1lQEF" role="37wK5m">
+                <node concept="37vLTw" id="dfChU1lQ_U" role="2Oq$k0">
+                  <ref role="3cqZAo" node="dfChU1lNtY" resolve="parent" />
+                </node>
+                <node concept="2OwXpG" id="1OShD0HC1yU" role="2OqNvi">
+                  <ref role="2Oxat5" node="1R$Cm9qGTDj" resolve="symbolPath" />
+                </node>
+              </node>
+            </node>
+            <node concept="37vLTw" id="1OShD0HBZ58" role="2Oq$k0">
+              <ref role="3cqZAo" node="1R$Cm9qGTDj" resolve="symbolPath" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="dfChU1lSG_" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="dfChU1lMar" role="jymVt" />
     <node concept="3clFb_" id="1R$Cm9qGYlZ" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="path" />
       <property role="od$2w" value="false" />
-      <property role="DiZV1" value="false" />
+      <property role="DiZV1" value="true" />
       <node concept="3clFbS" id="1R$Cm9qGYm2" role="3clF47">
         <node concept="3clFbF" id="1R$Cm9qGYJ8" role="3cqZAp">
           <node concept="37vLTw" id="1R$Cm9qGYJ7" role="3clFbG">
@@ -1499,7 +1961,274 @@
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="1bm7a6EX$CM" role="jymVt" />
+    <node concept="2tJIrI" id="1OShD0HCtUD" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jP_HO" role="jymVt">
+      <property role="TrG5h" value="equals" />
+      <node concept="10P_77" id="1mP5b6jP_HP" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jP_HQ" role="1B3o_S" />
+      <node concept="3clFbS" id="1mP5b6jP_HR" role="3clF47">
+        <node concept="3clFbJ" id="1mP5b6jP_HS" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jP_HT" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jP_HU" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jP_HV" role="3cqZAk">
+                <property role="3clFbU" value="true" />
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+            </node>
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+          <node concept="3clFbC" id="1mP5b6jP_HW" role="3clFbw">
+            <node concept="Xjq3P" id="1mP5b6jP_HN" role="3uHU7B" />
+            <node concept="37vLTw" id="1mP5b6jP_HX" role="3uHU7w">
+              <ref role="3cqZAo" node="1mP5b6jP_Ik" resolve="o" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jP_HY" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jP_HZ" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jP_I0" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jP_I1" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="22lmx$" id="1mP5b6jP_I2" role="3clFbw">
+            <node concept="3clFbC" id="1mP5b6jP_I3" role="3uHU7B">
+              <node concept="37vLTw" id="1mP5b6jP_I4" role="3uHU7B">
+                <ref role="3cqZAo" node="1mP5b6jP_Ik" resolve="o" />
+              </node>
+              <node concept="10Nm6u" id="1mP5b6jP_I5" role="3uHU7w" />
+            </node>
+            <node concept="3y3z36" id="1mP5b6jP_I6" role="3uHU7w">
+              <node concept="2OqwBi" id="1mP5b6jP_I7" role="3uHU7B">
+                <node concept="Xjq3P" id="1mP5b6jP_I8" role="2Oq$k0" />
+                <node concept="liA8E" id="1mP5b6jP_I9" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+              <node concept="2OqwBi" id="1mP5b6jP_Ia" role="3uHU7w">
+                <node concept="37vLTw" id="1mP5b6jP_Ib" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jP_Ik" resolve="o" />
+                </node>
+                <node concept="liA8E" id="1mP5b6jP_Ic" role="2OqNvi">
+                  <ref role="37wK5l" to="e2lb:~Object.getClass():java.lang.Class" resolve="getClass" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jP_Id" role="3cqZAp" />
+        <node concept="3cpWs8" id="1mP5b6jP_Ie" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jP_If" role="3cpWs9">
+            <property role="TrG5h" value="that" />
+            <node concept="3uibUv" id="1mP5b6jP_Ig" role="1tU5fm">
+              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+            </node>
+            <node concept="10QFUN" id="1mP5b6jP_Ih" role="33vP2m">
+              <node concept="3uibUv" id="1mP5b6jP_Ii" role="10QFUM">
+                <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              </node>
+              <node concept="37vLTw" id="1mP5b6jP_Ij" role="10QFUP">
+                <ref role="3cqZAo" node="1mP5b6jP_Ik" resolve="o" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jP_Is" role="3cqZAp">
+          <node concept="3fqX7Q" id="1mP5b6jP_It" role="3clFbw">
+            <node concept="2YIFZM" id="1mP5b6jP_Iu" role="3fr31v">
+              <ref role="1Pybhc" to="k7g3:~Arrays" resolve="Arrays" />
+              <ref role="37wK5l" to="k7g3:~Arrays.equals(java.lang.Object[],java.lang.Object[]):boolean" resolve="equals" />
+              <node concept="37vLTw" id="1mP5b6jP_Iq" role="37wK5m">
+                <ref role="3cqZAo" node="5JQSuNswjST" resolve="branches" />
+              </node>
+              <node concept="2OqwBi" id="1mP5b6jP_Iv" role="37wK5m">
+                <node concept="37vLTw" id="1mP5b6jP_In" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jP_If" resolve="that" />
+                </node>
+                <node concept="2OwXpG" id="1mP5b6jP_Ir" role="2OqNvi">
+                  <ref role="2Oxat5" node="5JQSuNswjST" resolve="branches" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbS" id="1mP5b6jP_Iw" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jP_Ix" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jP_Iy" role="3cqZAk">
+                <property role="3clFbU" value="false" />
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+          </node>
+        </node>
+        <node concept="3clFbJ" id="1mP5b6jP_IB" role="3cqZAp">
+          <node concept="3clFbS" id="1mP5b6jP_IC" role="3clFbx">
+            <node concept="3cpWs6" id="1mP5b6jP_ID" role="3cqZAp">
+              <node concept="3clFbT" id="1mP5b6jP_IE" role="3cqZAk">
+                <property role="3clFbU" value="false" />
+              </node>
+            </node>
+          </node>
+          <node concept="3K4zz7" id="1mP5b6jP_IF" role="3clFbw">
+            <node concept="3fqX7Q" id="1mP5b6jP_IG" role="3K4E3e">
+              <node concept="2OqwBi" id="1mP5b6jP_IH" role="3fr31v">
+                <node concept="liA8E" id="1mP5b6jP_II" role="2OqNvi">
+                  <ref role="37wK5l" node="1R$Cm9qHk6N" resolve="equals" />
+                  <node concept="2OqwBi" id="1mP5b6jP_IJ" role="37wK5m">
+                    <node concept="37vLTw" id="1mP5b6jP_IK" role="2Oq$k0">
+                      <ref role="3cqZAo" node="1mP5b6jP_If" resolve="that" />
+                    </node>
+                    <node concept="2OwXpG" id="1mP5b6jP_Iz" role="2OqNvi">
+                      <ref role="2Oxat5" node="1R$Cm9qGTDj" resolve="symbolPath" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="37vLTw" id="1mP5b6jP_I$" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1R$Cm9qGTDj" resolve="symbolPath" />
+                </node>
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jP_IL" role="3K4Cdx">
+              <node concept="10Nm6u" id="1mP5b6jP_IM" role="3uHU7w" />
+              <node concept="37vLTw" id="1mP5b6jP_I_" role="3uHU7B">
+                <ref role="3cqZAo" node="1R$Cm9qGTDj" resolve="symbolPath" />
+              </node>
+            </node>
+            <node concept="3y3z36" id="1mP5b6jP_IN" role="3K4GZi">
+              <node concept="10Nm6u" id="1mP5b6jP_IO" role="3uHU7w" />
+              <node concept="2OqwBi" id="1mP5b6jP_IP" role="3uHU7B">
+                <node concept="37vLTw" id="1mP5b6jP_IQ" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1mP5b6jP_If" resolve="that" />
+                </node>
+                <node concept="2OwXpG" id="1mP5b6jP_IA" role="2OqNvi">
+                  <ref role="2Oxat5" node="1R$Cm9qGTDj" resolve="symbolPath" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1mP5b6jP_IR" role="3cqZAp" />
+        <node concept="3clFbF" id="1mP5b6jP_IS" role="3cqZAp">
+          <node concept="3clFbT" id="1mP5b6jP_IT" role="3clFbG">
+            <property role="3clFbU" value="true" />
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="1mP5b6jP_Ik" role="3clF46">
+        <property role="TrG5h" value="o" />
+        <node concept="3uibUv" id="1mP5b6jP_Il" role="1tU5fm">
+          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jP_Im" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
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+    <node concept="2tJIrI" id="1mP5b6jPKJM" role="jymVt" />
+    <node concept="3clFb_" id="1mP5b6jP_IU" role="jymVt">
+      <property role="TrG5h" value="hashCode" />
+      <node concept="10Oyi0" id="1mP5b6jP_IV" role="3clF45" />
+      <node concept="3Tm1VV" id="1mP5b6jP_IW" role="1B3o_S" />
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+        <node concept="3cpWs8" id="1mP5b6jP_IZ" role="3cqZAp">
+          <node concept="3cpWsn" id="1mP5b6jP_J0" role="3cpWs9">
+            <property role="TrG5h" value="result" />
+            <node concept="10Oyi0" id="1mP5b6jP_J1" role="1tU5fm" />
+            <node concept="3cmrfG" id="1mP5b6jP_J2" role="33vP2m">
+              <property role="3cmrfH" value="23" />
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+        <node concept="3clFbF" id="1mP5b6jP_Jc" role="3cqZAp">
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+                <node concept="3cmrfG" id="1mP5b6jP_J9" role="3uHU7B">
+                  <property role="3cmrfH" value="37" />
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+                  <ref role="3cqZAo" node="1mP5b6jP_J0" resolve="result" />
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+                    <ref role="1Pybhc" to="k7g3:~Arrays" resolve="Arrays" />
+                    <ref role="37wK5l" to="k7g3:~Arrays.hashCode(java.lang.Object[]):int" resolve="hashCode" />
+                    <node concept="37vLTw" id="1mP5b6jP_Ja" role="37wK5m">
+                      <ref role="3cqZAo" node="5JQSuNswjST" resolve="branches" />
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+                        <node concept="3uibUv" id="1mP5b6jP_JA" role="10QFUM">
+                          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
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+                        <node concept="37vLTw" id="1mP5b6jP_Jq" role="10QFUP">
+                          <ref role="3cqZAo" node="1R$Cm9qGTDj" resolve="symbolPath" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="1mP5b6jP_JB" role="2OqNvi">
+                      <ref role="37wK5l" to="e2lb:~Object.hashCode():int" resolve="hashCode" />
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+                  </node>
+                </node>
+              </node>
+              <node concept="17qRlL" id="1mP5b6jP_Jm" role="3uHU7B">
+                <node concept="3cmrfG" id="1mP5b6jP_Jn" role="3uHU7B">
+                  <property role="3cmrfH" value="43" />
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+                <node concept="37vLTw" id="1mP5b6jP_Jo" role="3uHU7w">
+                  <ref role="3cqZAo" node="1mP5b6jP_J0" resolve="result" />
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+              </node>
+            </node>
+            <node concept="37vLTw" id="1mP5b6jP_JC" role="37vLTJ">
+              <ref role="3cqZAo" node="1mP5b6jP_J0" resolve="result" />
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+          </node>
+        </node>
+        <node concept="3clFbF" id="1mP5b6jP_JD" role="3cqZAp">
+          <node concept="37vLTw" id="1mP5b6jP_JE" role="3clFbG">
+            <ref role="3cqZAo" node="1mP5b6jP_J0" resolve="result" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="1mP5b6jP_IY" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
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+    <node concept="2tJIrI" id="1mP5b6jPLTr" role="jymVt" />
     <node concept="3clFb_" id="1bm7a6EXK6a" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="childrenArr" />
@@ -1572,7 +2301,6 @@
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     <node concept="312cEg" id="1R$Cm9qGTDj" role="jymVt">
       <property role="34CwA1" value="false" />
       <property role="eg7rD" value="false" />
@@ -1595,11 +2323,9 @@
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     <node concept="3uibUv" id="5JQSuNswOY9" role="1zkMxy">
       <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-      <node concept="3uibUv" id="5JQSuNswSi8" role="11_B2D">
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-        <node concept="16syzq" id="5JQSuNswV2G" role="11_B2D">
-          <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
-        </node>
+      <node concept="3uibUv" id="dfChU1mjX_" role="11_B2D">
+        <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+        <node concept="3qTvmN" id="1OShD0HZ8BY" role="11_B2D" />
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     </node>
     <node concept="2tJIrI" id="5JQSuNsxgT7" role="jymVt" />
@@ -1617,8 +2343,8 @@
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           <node concept="3uibUv" id="5JQSuNsxhtQ" role="8Xvag">
-            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-            <node concept="3qTvmN" id="6$jH9oLf5mO" role="11_B2D" />
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+            <node concept="3qTvmN" id="1OShD0HZ6MM" role="11_B2D" />
           </node>
         </node>
       </node>
@@ -1665,20 +2391,15 @@
         </node>
         <node concept="1DcWWT" id="1R$Cm9qGVt3" role="3cqZAp">
           <node concept="3clFbS" id="1R$Cm9qGVt6" role="2LFqv$">
-            <node concept="3clFbF" id="1R$Cm9qGZzo" role="3cqZAp">
-              <node concept="2OqwBi" id="1R$Cm9qGZHS" role="3clFbG">
-                <node concept="2OqwBi" id="3OPtF0349yF" role="2Oq$k0">
-                  <node concept="37vLTw" id="3OPtF0349yG" role="2Oq$k0">
-                    <ref role="3cqZAo" node="1R$Cm9qGVt9" resolve="ch" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF0349yH" role="2OqNvi">
-                    <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-                  </node>
+            <node concept="3clFbF" id="dfChU1mgHX" role="3cqZAp">
+              <node concept="2OqwBi" id="dfChU1mgKb" role="3clFbG">
+                <node concept="37vLTw" id="dfChU1mgHV" role="2Oq$k0">
+                  <ref role="3cqZAo" node="1R$Cm9qGVt9" resolve="ch" />
                 </node>
-                <node concept="liA8E" id="1R$Cm9qGZOe" role="2OqNvi">
-                  <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                  <node concept="37vLTw" id="6$jH9oLdIOr" role="37wK5m">
-                    <ref role="3cqZAo" node="6$jH9oLdIka" resolve="path" />
+                <node concept="liA8E" id="dfChU1mh4C" role="2OqNvi">
+                  <ref role="37wK5l" node="dfChU1lFHl" resolve="attached" />
+                  <node concept="37vLTw" id="dfChU1mhop" role="37wK5m">
+                    <ref role="3cqZAo" node="1R$Cm9qGVi$" resolve="br" />
                   </node>
                 </node>
               </node>
@@ -1687,7 +2408,7 @@
           <node concept="3cpWsn" id="1R$Cm9qGVt9" role="1Duv9x">
             <property role="TrG5h" value="ch" />
             <node concept="3uibUv" id="1R$Cm9qGVEy" role="1tU5fm">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="6$jH9oLf7u4" role="11_B2D" />
             </node>
           </node>
@@ -1740,8 +2461,9 @@
       <node concept="37vLTG" id="5JQSuNswPj8" role="3clF46">
         <property role="TrG5h" value="children" />
         <node concept="10Q1$e" id="5JQSuNswQ9p" role="1tU5fm">
-          <node concept="3uibUv" id="5JQSuNswVCy" role="10Q1$1">
-            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+          <node concept="3uibUv" id="dfChU1lAUt" role="10Q1$1">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+            <node concept="3qTvmN" id="1OShD0HZ8el" role="11_B2D" />
           </node>
         </node>
       </node>
@@ -1762,8 +2484,9 @@
           <node concept="3cpWsn" id="1bm7a6F2ReM" role="3cpWs9">
             <property role="TrG5h" value="childrenCopy" />
             <node concept="10Q1$e" id="1bm7a6F2ReC" role="1tU5fm">
-              <node concept="3uibUv" id="1bm7a6F2ReF" role="10Q1$1">
-                <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <node concept="3uibUv" id="dfChU1mp8C" role="10Q1$1">
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+                <node concept="3qTvmN" id="1OShD0HZaS0" role="11_B2D" />
               </node>
             </node>
             <node concept="2ShNRf" id="1bm7a6F2ReN" role="33vP2m">
@@ -1773,8 +2496,8 @@
                     <ref role="37wK5l" node="6$jH9oLbZOI" resolve="childrenSize" />
                   </node>
                 </node>
-                <node concept="3uibUv" id="1bm7a6F2ReR" role="3$_nBY">
-                  <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+                <node concept="3uibUv" id="dfChU1moFh" role="3$_nBY">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
                 </node>
               </node>
             </node>
@@ -1792,7 +2515,7 @@
                     </node>
                   </node>
                   <node concept="liA8E" id="1bm7a6F2Wb5" role="2OqNvi">
-                    <ref role="37wK5l" node="1bm7a6EYD0x" resolve="copyRecursively" />
+                    <ref role="37wK5l" node="1bm7a6EXvNI" resolve="copyRecursively" />
                   </node>
                 </node>
                 <node concept="AH0OO" id="1bm7a6F2V8J" role="37vLTJ">
@@ -1831,13 +2554,8 @@
           <node concept="2YIFZM" id="1bm7a6EYa5i" role="3clFbG">
             <ref role="37wK5l" node="5JQSuNsxhfn" resolve="create" />
             <ref role="1Pybhc" node="5JQSuNswOXL" resolve="ChildrenBranch" />
-            <node concept="2OqwBi" id="1bm7a6EYaTL" role="37wK5m">
-              <node concept="1rXfSq" id="1bm7a6EYaHd" role="2Oq$k0">
-                <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-              </node>
-              <node concept="liA8E" id="1bm7a6EYb5h" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HEWkI" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
             <node concept="37vLTw" id="1bm7a6F2WHc" role="37wK5m">
               <ref role="3cqZAo" node="1bm7a6F2ReM" resolve="childrenCopy" />
@@ -1871,9 +2589,9 @@
           <node concept="3cpWsn" id="3OPtF02TEoI" role="3cpWs9">
             <property role="TrG5h" value="childrenCopy" />
             <node concept="10Q1$e" id="3OPtF02TEoJ" role="1tU5fm">
-              <node concept="3uibUv" id="5s497VqEAyr" role="10Q1$1">
-                <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                <node concept="16syzq" id="5s497VqMSKE" role="11_B2D">
+              <node concept="3uibUv" id="1OShD0HXz2S" role="10Q1$1">
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+                <node concept="16syzq" id="1OShD0HXz2T" role="11_B2D">
                   <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
                 </node>
               </node>
@@ -1885,8 +2603,8 @@
                     <ref role="37wK5l" node="6$jH9oLbZOI" resolve="childrenSize" />
                   </node>
                 </node>
-                <node concept="3uibUv" id="3OPtF02TEoP" role="3$_nBY">
-                  <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+                <node concept="3uibUv" id="1OShD0HY4e9" role="3$_nBY">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
                 </node>
               </node>
             </node>
@@ -1905,12 +2623,6 @@
                   </node>
                 </node>
                 <node concept="10QFUN" id="5s497VqMR1g" role="37vLTx">
-                  <node concept="3uibUv" id="5s497VqMR1a" role="10QFUM">
-                    <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                    <node concept="16syzq" id="5s497VqMUpT" role="11_B2D">
-                      <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
-                    </node>
-                  </node>
                   <node concept="2OqwBi" id="5s497VqMR1b" role="10QFUP">
                     <node concept="37vLTw" id="5s497VqMR1c" role="2Oq$k0">
                       <ref role="3cqZAo" node="3OPtF02T_i4" resolve="mapper" />
@@ -1925,6 +2637,12 @@
                       </node>
                     </node>
                   </node>
+                  <node concept="3uibUv" id="1OShD0HXzKy" role="10QFUM">
+                    <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+                    <node concept="16syzq" id="1OShD0HXzKz" role="11_B2D">
+                      <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
+                    </node>
+                  </node>
                 </node>
               </node>
             </node>
@@ -1951,29 +2669,24 @@
           </node>
         </node>
         <node concept="3clFbF" id="3OPtF02TEp9" role="3cqZAp">
-          <node concept="2YIFZM" id="3OPtF02TEpa" role="3clFbG">
+          <node concept="2YIFZM" id="1OShD0HXM0v" role="3clFbG">
             <ref role="1Pybhc" node="5JQSuNswOXL" resolve="ChildrenBranch" />
             <ref role="37wK5l" node="5JQSuNsxhfn" resolve="create" />
-            <node concept="2OqwBi" id="3OPtF02TEpb" role="37wK5m">
-              <node concept="1rXfSq" id="3OPtF02TEpc" role="2Oq$k0">
-                <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-              </node>
-              <node concept="liA8E" id="3OPtF02TEpd" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HXM0w" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
-            <node concept="37vLTw" id="3OPtF02TEpe" role="37wK5m">
+            <node concept="37vLTw" id="1OShD0HXM0x" role="37wK5m">
               <ref role="3cqZAo" node="3OPtF02TEoI" resolve="childrenCopy" />
             </node>
-            <node concept="16syzq" id="3OPtF02TEpf" role="3PaCim">
+            <node concept="16syzq" id="1OShD0HXM0y" role="3PaCim">
               <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
             </node>
           </node>
         </node>
       </node>
-      <node concept="3uibUv" id="3OPtF02VBI9" role="3clF45">
+      <node concept="3uibUv" id="1OShD0HXE6k" role="3clF45">
         <ref role="3uigEE" node="5JQSuNswOXL" resolve="ChildrenBranch" />
-        <node concept="16syzq" id="3OPtF02VBIa" role="11_B2D">
+        <node concept="16syzq" id="1OShD0HXEVJ" role="11_B2D">
           <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
         </node>
       </node>
@@ -2042,13 +2755,8 @@
                 <node concept="2YIFZM" id="2q_78a92rlC" role="37wK5m">
                   <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
                   <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
-                  <node concept="2OqwBi" id="2q_78a92rlD" role="37wK5m">
-                    <node concept="1rXfSq" id="2q_78a92rlE" role="2Oq$k0">
-                      <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-                    </node>
-                    <node concept="liA8E" id="2q_78a92rlF" role="2OqNvi">
-                      <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                    </node>
+                  <node concept="1rXfSq" id="1OShD0HEW1c" role="37wK5m">
+                    <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
                   </node>
                 </node>
               </node>
@@ -2109,11 +2817,9 @@
           </node>
           <node concept="3cpWsn" id="2q_78a92nag" role="1Duv9x">
             <property role="TrG5h" value="br" />
-            <node concept="3uibUv" id="2q_78a92nak" role="1tU5fm">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-              <node concept="16syzq" id="2q_78a92nal" role="11_B2D">
-                <ref role="16sUi3" node="5JQSuNswS6P" resolve="T" />
-              </node>
+            <node concept="3uibUv" id="dfChU1mmDM" role="1tU5fm">
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+              <node concept="3qTvmN" id="dfChU1mmTs" role="11_B2D" />
             </node>
           </node>
           <node concept="1rXfSq" id="2q_78a92nam" role="1DdaDG">
@@ -2218,31 +2924,124 @@
         <property role="TrG5h" value="children" />
         <node concept="8X2XB" id="5JQSuNsxjiz" role="1tU5fm">
           <node concept="3uibUv" id="5JQSuNsxjhT" role="8Xvag">
-            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-            <node concept="3qTvmN" id="6$jH9oLeXJK" role="11_B2D" />
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+            <node concept="3qTvmN" id="1OShD0HZ4Mu" role="11_B2D" />
           </node>
         </node>
       </node>
       <node concept="3clFbS" id="5JQSuNsxgzq" role="3clF47">
+        <node concept="3clFbJ" id="1OShD0HWup0" role="3cqZAp">
+          <node concept="3clFbS" id="1OShD0HWup2" role="3clFbx">
+            <node concept="3cpWs6" id="1OShD0HWw5a" role="3cqZAp">
+              <node concept="2YIFZM" id="1OShD0HWwsk" role="3cqZAk">
+                <ref role="37wK5l" node="3OPtF03lcom" resolve="create" />
+                <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                <node concept="37vLTw" id="1OShD0HWwHx" role="37wK5m">
+                  <ref role="3cqZAo" node="5JQSuNsxg_M" resolve="symbol" />
+                </node>
+                <node concept="16syzq" id="1OShD0HWA2k" role="3PaCim">
+                  <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="1OShD0HWvX9" role="3clFbw">
+            <node concept="2OqwBi" id="1OShD0HWuIM" role="3uHU7B">
+              <node concept="37vLTw" id="1OShD0HWuFm" role="2Oq$k0">
+                <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
+              </node>
+              <node concept="1Rwk04" id="1OShD0HWvmc" role="2OqNvi" />
+            </node>
+            <node concept="3cmrfG" id="1OShD0HWw48" role="3uHU7w">
+              <property role="3cmrfH" value="0" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbJ" id="1OShD0HZIb$" role="3cqZAp">
+          <node concept="3clFbS" id="1OShD0HZIbA" role="3clFbx">
+            <node concept="3cpWs6" id="1OShD0HZLkl" role="3cqZAp">
+              <node concept="2YIFZM" id="1OShD0HZLDq" role="3cqZAk">
+                <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                <ref role="37wK5l" node="1OShD0HL7j9" resolve="create" />
+                <node concept="37vLTw" id="1OShD0HZLDr" role="37wK5m">
+                  <ref role="3cqZAo" node="5JQSuNsxg_M" resolve="symbol" />
+                </node>
+                <node concept="10QFUN" id="1OShD0HZNyG" role="37wK5m">
+                  <node concept="3uibUv" id="1OShD0HZOrj" role="10QFUM">
+                    <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+                    <node concept="16syzq" id="1OShD0HZRO_" role="11_B2D">
+                      <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+                    </node>
+                  </node>
+                  <node concept="AH0OO" id="1OShD0HZQdL" role="10QFUP">
+                    <node concept="3cmrfG" id="1OShD0HZQzW" role="AHEQo">
+                      <property role="3cmrfH" value="0" />
+                    </node>
+                    <node concept="37vLTw" id="1OShD0HZPHQ" role="AHHXb">
+                      <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="16syzq" id="1OShD0HZW7f" role="3PaCim">
+                  <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="1Wc70l" id="1OShD0HZKbm" role="3clFbw">
+            <node concept="2ZW3vV" id="1OShD0HZKD7" role="3uHU7w">
+              <node concept="3uibUv" id="1OShD0HZKT_" role="2ZW6by">
+                <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              </node>
+              <node concept="AH0OO" id="1OShD0HZKth" role="2ZW6bz">
+                <node concept="3cmrfG" id="1OShD0HZKyM" role="AHEQo">
+                  <property role="3cmrfH" value="0" />
+                </node>
+                <node concept="37vLTw" id="1OShD0HZKnM" role="AHHXb">
+                  <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbC" id="1OShD0HZJOG" role="3uHU7B">
+              <node concept="2OqwBi" id="1OShD0HZIxV" role="3uHU7B">
+                <node concept="37vLTw" id="1OShD0HZIoQ" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
+                </node>
+                <node concept="1Rwk04" id="1OShD0HZJbJ" role="2OqNvi" />
+              </node>
+              <node concept="3cmrfG" id="1OShD0HZJPd" role="3uHU7w">
+                <property role="3cmrfH" value="1" />
+              </node>
+            </node>
+          </node>
+        </node>
         <node concept="3clFbF" id="5JQSuNsxjjJ" role="3cqZAp">
-          <node concept="2YIFZM" id="5JQSuNsxjk2" role="3clFbG">
-            <ref role="37wK5l" node="5JQSuNsxhfn" resolve="create" />
-            <ref role="1Pybhc" node="5JQSuNswOXL" resolve="ChildrenBranch" />
-            <node concept="37vLTw" id="5JQSuNsxjmj" role="37wK5m">
-              <ref role="3cqZAo" node="5JQSuNsxg_M" resolve="symbol" />
+          <node concept="10QFUN" id="1OShD0HYitc" role="3clFbG">
+            <node concept="2YIFZM" id="1OShD0HYit8" role="10QFUP">
+              <ref role="37wK5l" node="5JQSuNsxhfn" resolve="create" />
+              <ref role="1Pybhc" node="5JQSuNswOXL" resolve="ChildrenBranch" />
+              <node concept="37vLTw" id="1OShD0HYit9" role="37wK5m">
+                <ref role="3cqZAo" node="5JQSuNsxg_M" resolve="symbol" />
+              </node>
+              <node concept="37vLTw" id="1OShD0HYita" role="37wK5m">
+                <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
+              </node>
+              <node concept="16syzq" id="1OShD0HYitb" role="3PaCim">
+                <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+              </node>
             </node>
-            <node concept="37vLTw" id="5JQSuNsxjru" role="37wK5m">
-              <ref role="3cqZAo" node="5JQSuNsxgAm" resolve="children" />
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-            <node concept="16syzq" id="5JQSuNsztRB" role="3PaCim">
-              <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+            <node concept="3uibUv" id="1OShD0HYiFL" role="10QFUM">
+              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <node concept="16syzq" id="1OShD0HYiFM" role="11_B2D">
+                <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
+              </node>
             </node>
           </node>
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       <node concept="3uibUv" id="5JQSuNsxgzf" role="3clF45">
-        <ref role="3uigEE" node="5JQSuNswOXL" resolve="ChildrenBranch" />
+        <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
         <node concept="16syzq" id="uNmovXd901" role="11_B2D">
           <ref role="16sUi3" node="5JQSuNsxhVi" resolve="T" />
         </node>
@@ -2255,6 +3054,68 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="1OShD0HVS6u" role="jymVt" />
+    <node concept="2YIFZL" id="1OShD0HVRI3" role="jymVt">
+      <property role="TrG5h" value="child" />
+      <property role="od$2w" value="false" />
+      <property role="DiZV1" value="false" />
+      <node concept="37vLTG" id="1OShD0HVRI4" role="3clF46">
+        <property role="TrG5h" value="symbol" />
+        <node concept="3uibUv" id="1OShD0HVRI5" role="1tU5fm">
+          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="37vLTG" id="1OShD0HVRI6" role="3clF46">
+        <property role="TrG5h" value="list" />
+        <node concept="3uibUv" id="1OShD0HVTe8" role="1tU5fm">
+          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+          <node concept="16syzq" id="1OShD0HW2lq" role="11_B2D">
+            <ref role="16sUi3" node="1OShD0HVRIj" resolve="T" />
+          </node>
+        </node>
+      </node>
+      <node concept="3clFbS" id="1OShD0HVRIa" role="3clF47">
+        <node concept="3SKdUt" id="1OShD0HW6Qw" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0HW70Q" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0HVWup" role="3cqZAp">
+          <node concept="10QFUN" id="1OShD0HW63Z" role="3clFbG">
+            <node concept="2YIFZM" id="1OShD0HW63W" role="10QFUP">
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <ref role="37wK5l" node="1OShD0HL7j9" resolve="create" />
+              <node concept="37vLTw" id="1OShD0HW63X" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HVRI4" resolve="symbol" />
+              </node>
+              <node concept="37vLTw" id="1OShD0HW63Y" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HVRI6" resolve="list" />
+              </node>
+            </node>
+            <node concept="3uibUv" id="1OShD0HW6gd" role="10QFUM">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HW6zU" role="11_B2D">
+                <ref role="16sUi3" node="1OShD0HVRIj" resolve="T" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="1OShD0HVRIg" role="1B3o_S" />
+      <node concept="3uibUv" id="1OShD0HVRIh" role="3clF45">
+        <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+        <node concept="16syzq" id="1OShD0HVRIi" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0HVRIj" resolve="T" />
+        </node>
+      </node>
+      <node concept="16euLQ" id="1OShD0HVRIj" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0HVRIk" role="3ztrMU">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="3qTvmN" id="1OShD0HVRIl" role="11_B2D" />
+        </node>
+      </node>
+    </node>
     <node concept="2tJIrI" id="1R$Cm9qHyZy" role="jymVt" />
     <node concept="2YIFZL" id="5JQSuNsx4I5" role="jymVt">
       <property role="TrG5h" value="value" />
@@ -2725,18 +3586,28 @@
             </node>
           </node>
         </node>
+        <node concept="3SKdUt" id="1OShD0I6Zv$" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0I6ZA2" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+          </node>
+        </node>
         <node concept="3clFbF" id="5s497Vql4GP" role="3cqZAp">
-          <node concept="2YIFZM" id="5s497Vql4GQ" role="3clFbG">
-            <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
-            <ref role="37wK5l" node="3OPtF03lcom" resolve="create" />
-            <node concept="37vLTw" id="5s497Vql4GR" role="37wK5m">
-              <ref role="3cqZAo" node="5s497Vql4Gf" resolve="symbol" />
+          <node concept="10QFUN" id="1OShD0I6Q15" role="3clFbG">
+            <node concept="2YIFZM" id="1OShD0I6Q11" role="10QFUP">
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <ref role="37wK5l" node="3OPtF03lcom" resolve="create" />
+              <node concept="37vLTw" id="1OShD0I6Q12" role="37wK5m">
+                <ref role="3cqZAo" node="5s497Vql4Gf" resolve="symbol" />
+              </node>
+              <node concept="37vLTw" id="1OShD0I6Q13" role="37wK5m">
+                <ref role="3cqZAo" node="5s497Vql4Gm" resolve="vars" />
+              </node>
             </node>
-            <node concept="37vLTw" id="5s497Vql4GS" role="37wK5m">
-              <ref role="3cqZAo" node="5s497Vql4Gm" resolve="vars" />
-            </node>
-            <node concept="16syzq" id="5s497Vql4GT" role="3PaCim">
-              <ref role="16sUi3" node="5s497Vql4GX" resolve="T" />
+            <node concept="3uibUv" id="1OShD0I6Rli" role="10QFUM">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0I6Rlj" role="11_B2D">
+                <ref role="16sUi3" node="5s497Vql4GX" resolve="T" />
+              </node>
             </node>
           </node>
         </node>
@@ -2775,29 +3646,40 @@
         <node concept="8X2XB" id="6$jH9oLaYQC" role="1tU5fm">
           <node concept="3uibUv" id="1bm7a6F18Nx" role="8Xvag">
             <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+            <node concept="3qTvmN" id="dfChU1l2u0" role="11_B2D" />
           </node>
         </node>
       </node>
       <node concept="3clFbS" id="6$jH9oLaYQF" role="3clF47">
+        <node concept="3SKdUt" id="1OShD0I73EH" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0I73EI" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+          </node>
+        </node>
         <node concept="3clFbF" id="6$jH9oLfPDC" role="3cqZAp">
-          <node concept="2YIFZM" id="6$jH9oLfPDZ" role="3clFbG">
-            <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
-            <ref role="37wK5l" node="3OPtF03lcom" resolve="create" />
-            <node concept="37vLTw" id="6$jH9oLhk3M" role="37wK5m">
-              <ref role="3cqZAo" node="6$jH9oLhhp2" resolve="symbol" />
+          <node concept="10QFUN" id="1OShD0I713R" role="3clFbG">
+            <node concept="2YIFZM" id="1OShD0I713N" role="10QFUP">
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <ref role="37wK5l" node="3OPtF03lcom" resolve="create" />
+              <node concept="37vLTw" id="1OShD0I713O" role="37wK5m">
+                <ref role="3cqZAo" node="6$jH9oLhhp2" resolve="symbol" />
+              </node>
+              <node concept="37vLTw" id="1OShD0I713P" role="37wK5m">
+                <ref role="3cqZAo" node="6$jH9oLaYQB" resolve="children" />
+              </node>
             </node>
-            <node concept="37vLTw" id="6$jH9oLfQ7$" role="37wK5m">
-              <ref role="3cqZAo" node="6$jH9oLaYQB" resolve="children" />
-            </node>
-            <node concept="16syzq" id="6$jH9oLkcFT" role="3PaCim">
-              <ref role="16sUi3" node="6$jH9oLaYQO" resolve="T" />
+            <node concept="3uibUv" id="1OShD0I71VN" role="10QFUM">
+              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <node concept="16syzq" id="1OShD0I71VO" role="11_B2D">
+                <ref role="16sUi3" node="6$jH9oLaYQO" resolve="T" />
+              </node>
             </node>
           </node>
         </node>
       </node>
       <node concept="3Tm1VV" id="6$jH9oLaYQL" role="1B3o_S" />
       <node concept="3uibUv" id="6$jH9oLaYQM" role="3clF45">
-        <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+        <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
         <node concept="16syzq" id="6$jH9oLkczs" role="11_B2D">
           <ref role="16sUi3" node="6$jH9oLaYQO" resolve="T" />
         </node>
@@ -3063,7 +3945,31 @@
         <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
       </node>
     </node>
-    <node concept="2tJIrI" id="2QE4RCGnpXb" role="jymVt" />
+    <node concept="2tJIrI" id="dfChU1lZe6" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1m0qM" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="attached" />
+      <node concept="37vLTG" id="dfChU1m0qN" role="3clF46">
+        <property role="TrG5h" value="parent" />
+        <node concept="3uibUv" id="dfChU1m0qO" role="1tU5fm">
+          <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+          <node concept="3qTvmN" id="dfChU1m0qP" role="11_B2D" />
+        </node>
+      </node>
+      <node concept="3cqZAl" id="dfChU1m0qQ" role="3clF45" />
+      <node concept="3Tm1VV" id="dfChU1m0qR" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1m0qW" role="3clF47">
+        <node concept="3SKdUt" id="dfChU1m6Ac" role="3cqZAp">
+          <node concept="3SKdUq" id="dfChU1m6Ae" role="3SKWNk">
+            <property role="3SKdUp" value="do nothing" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="dfChU1m1Og" role="2AJF6D">
+        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="dfChU1m6Ag" role="jymVt" />
     <node concept="3clFb_" id="104EUzFOWtH" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="acceptVisitor" />
@@ -3441,13 +4347,8 @@
           <node concept="2YIFZM" id="1bm7a6EXPoQ" role="3clFbG">
             <ref role="1Pybhc" node="uNmovXiSQ6" resolve="VariableBranch" />
             <ref role="37wK5l" node="uNmovXj0Sl" resolve="create" />
-            <node concept="2OqwBi" id="1bm7a6EXHkf" role="37wK5m">
-              <node concept="1rXfSq" id="1bm7a6EXHdN" role="2Oq$k0">
-                <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-              </node>
-              <node concept="liA8E" id="1bm7a6EXHxU" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HF8LH" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
             <node concept="1rXfSq" id="1bm7a6EXLUT" role="37wK5m">
               <ref role="37wK5l" node="1bm7a6EXK6a" resolve="childrenArr" />
@@ -3558,13 +4459,8 @@
           <node concept="2YIFZM" id="3OPtF02UDuZ" role="3clFbG">
             <ref role="37wK5l" node="uNmovXj0Sl" resolve="create" />
             <ref role="1Pybhc" node="uNmovXiSQ6" resolve="VariableBranch" />
-            <node concept="2OqwBi" id="3OPtF02UDVe" role="37wK5m">
-              <node concept="1rXfSq" id="3OPtF02UDRN" role="2Oq$k0">
-                <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-              </node>
-              <node concept="liA8E" id="3OPtF02UE3n" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-              </node>
+            <node concept="1rXfSq" id="1OShD0HF92A" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
             </node>
             <node concept="37vLTw" id="3OPtF02UEm9" role="37wK5m">
               <ref role="3cqZAo" node="3OPtF02UsLL" resolve="vars" />
@@ -3718,13 +4614,8 @@
                 <node concept="2YIFZM" id="2q_78a93wwB" role="37wK5m">
                   <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
                   <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
-                  <node concept="2OqwBi" id="2q_78a93wwC" role="37wK5m">
-                    <node concept="1rXfSq" id="2q_78a93wwD" role="2Oq$k0">
-                      <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-                    </node>
-                    <node concept="liA8E" id="2q_78a93wwE" role="2OqNvi">
-                      <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                    </node>
+                  <node concept="1rXfSq" id="1OShD0HEUFS" role="37wK5m">
+                    <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
                   </node>
                 </node>
               </node>
@@ -4271,7 +5162,22 @@
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="3OPtF02Tciw" role="jymVt" />
+    <node concept="2tJIrI" id="dfChU1lDK8" role="jymVt" />
+    <node concept="3clFb_" id="dfChU1lFHl" role="jymVt">
+      <property role="1EzhhJ" value="true" />
+      <property role="TrG5h" value="attached" />
+      <node concept="37vLTG" id="dfChU1lHv$" role="3clF46">
+        <property role="TrG5h" value="parent" />
+        <node concept="3uibUv" id="dfChU1lIPj" role="1tU5fm">
+          <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+          <node concept="3qTvmN" id="dfChU1lJ8l" role="11_B2D" />
+        </node>
+      </node>
+      <node concept="3cqZAl" id="dfChU1lFHn" role="3clF45" />
+      <node concept="3Tm1VV" id="dfChU1lFHo" role="1B3o_S" />
+      <node concept="3clFbS" id="dfChU1lFHp" role="3clF47" />
+    </node>
+    <node concept="2tJIrI" id="dfChU1lGap" role="jymVt" />
     <node concept="3clFb_" id="104EUzFOBnD" role="jymVt">
       <property role="1EzhhJ" value="true" />
       <property role="TrG5h" value="acceptVisitor" />
@@ -4486,7 +5392,7 @@
           <property role="TrG5h" value="children" />
           <node concept="10Q1$e" id="3JgCwkqiP3w" role="1tU5fm">
             <node concept="3uibUv" id="3JgCwkqiP3x" role="10Q1$1">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="3JgCwkqiP3y" role="11_B2D" />
             </node>
           </node>
@@ -4870,10 +5776,8 @@
             <property role="TrG5h" value="childrenArr" />
             <node concept="10Q1$e" id="47nvOnTSwYG" role="1tU5fm">
               <node concept="3uibUv" id="47nvOnTSwYN" role="10Q1$1">
-                <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                <node concept="16syzq" id="47nvOnTSwYO" role="11_B2D">
-                  <ref role="16sUi3" node="47nvOnTQNVO" resolve="T" />
-                </node>
+                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+                <node concept="3qTvmN" id="dfChU1mQGg" role="11_B2D" />
               </node>
             </node>
             <node concept="2OqwBi" id="47nvOnTSwYR" role="33vP2m">
@@ -6128,7 +7032,7 @@
           <property role="TrG5h" value="children" />
           <node concept="10Q1$e" id="3OPtF03hrN7" role="1tU5fm">
             <node concept="3uibUv" id="3OPtF03hrN8" role="10Q1$1">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="3OPtF03hrN9" role="11_B2D" />
             </node>
           </node>
@@ -6693,7 +7597,7 @@
           <property role="TrG5h" value="children" />
           <node concept="10Q1$e" id="3OPtF03oA2D" role="1tU5fm">
             <node concept="3uibUv" id="3OPtF03oA2E" role="10Q1$1">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="3OPtF03oA2F" role="11_B2D" />
             </node>
           </node>
@@ -7129,7 +8033,7 @@
           <property role="TrG5h" value="children" />
           <node concept="10Q1$e" id="3OPtF03cqRj" role="1tU5fm">
             <node concept="3uibUv" id="3OPtF03cqRk" role="10Q1$1">
-              <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+              <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
               <node concept="3qTvmN" id="3OPtF03cqRl" role="11_B2D" />
             </node>
           </node>
@@ -8545,8 +9449,8 @@
       <node concept="37vLTG" id="3OPtF03lcop" role="3clF46">
         <property role="TrG5h" value="elements" />
         <node concept="8X2XB" id="3OPtF03lcoq" role="1tU5fm">
-          <node concept="3uibUv" id="3OPtF03lcor" role="8Xvag">
-            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="16syzq" id="1OShD0I5pnK" role="8Xvag">
+            <ref role="16sUi3" node="3OPtF03lcoH" resolve="T" />
           </node>
         </node>
       </node>
@@ -8566,29 +9470,71 @@
             </node>
           </node>
         </node>
-        <node concept="3clFbF" id="3OPtF03lcoy" role="3cqZAp">
-          <node concept="2ShNRf" id="3OPtF03lcoz" role="3clFbG">
-            <node concept="1pGfFk" id="3OPtF03lco$" role="2ShVmc">
-              <ref role="37wK5l" node="3OPtF03lcrB" resolve="ListBranch" />
-              <node concept="37vLTw" id="3OPtF03lco_" role="37wK5m">
-                <ref role="3cqZAo" node="3OPtF03lcou" resolve="path" />
+        <node concept="3cpWs8" id="1OShD0HLC6z" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0HLC6$" role="3cpWs9">
+            <property role="TrG5h" value="tail" />
+            <node concept="3uibUv" id="1OShD0HLC6i" role="1tU5fm">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HLLh2" role="11_B2D">
+                <ref role="16sUi3" node="3OPtF03lcoH" resolve="T" />
               </node>
-              <node concept="2YIFZM" id="3OPtF03lcoA" role="37wK5m">
-                <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
-                <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
-                <node concept="37vLTw" id="3OPtF03lcoB" role="37wK5m">
+            </node>
+            <node concept="2YIFZM" id="1OShD0HLC6_" role="33vP2m">
+              <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="37vLTw" id="1OShD0HLC6A" role="37wK5m">
+                <ref role="3cqZAo" node="3OPtF03lcop" resolve="elements" />
+              </node>
+              <node concept="3cmrfG" id="1OShD0HLC6B" role="37wK5m">
+                <property role="3cmrfH" value="0" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="1OShD0HFYQ8" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0HFYQ9" role="3cpWs9">
+            <property role="TrG5h" value="lb" />
+            <node concept="3uibUv" id="1OShD0HFYPA" role="1tU5fm">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HLK$_" role="11_B2D">
+                <ref role="16sUi3" node="3OPtF03lcoH" resolve="T" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="1OShD0HFYQa" role="33vP2m">
+              <node concept="1pGfFk" id="1OShD0HFYQb" role="2ShVmc">
+                <ref role="37wK5l" node="3OPtF03lcrB" resolve="ListBranch" />
+                <node concept="37vLTw" id="1OShD0HFYQc" role="37wK5m">
                   <ref role="3cqZAo" node="3OPtF03lcou" resolve="path" />
                 </node>
-                <node concept="37vLTw" id="3OPtF03lcoC" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcop" resolve="elements" />
+                <node concept="37vLTw" id="1OShD0HLC6C" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HLC6$" resolve="tail" />
                 </node>
-                <node concept="3cmrfG" id="3OPtF03lcoD" role="37wK5m">
-                  <property role="3cmrfH" value="0" />
+                <node concept="16syzq" id="1OShD0HLKR$" role="1pMfVU">
+                  <ref role="16sUi3" node="3OPtF03lcoH" resolve="T" />
                 </node>
               </node>
             </node>
           </node>
         </node>
+        <node concept="3clFbF" id="1OShD0HLEWP" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0HLFaH" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0HLEWN" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0HLC6$" resolve="tail" />
+            </node>
+            <node concept="liA8E" id="1OShD0HLFX0" role="2OqNvi">
+              <ref role="37wK5l" node="dfChU1lNtX" resolve="attached" />
+              <node concept="37vLTw" id="1OShD0HLGef" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HFYQ9" resolve="lb" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1OShD0HLBZE" role="3cqZAp" />
+        <node concept="3clFbF" id="3OPtF03lcoy" role="3cqZAp">
+          <node concept="37vLTw" id="1OShD0HFYQh" role="3clFbG">
+            <ref role="3cqZAo" node="1OShD0HFYQ9" resolve="lb" />
+          </node>
+        </node>
       </node>
       <node concept="3Tm1VV" id="3OPtF03lcoE" role="1B3o_S" />
       <node concept="3uibUv" id="3OPtF03lcoF" role="3clF45">
@@ -8605,22 +9551,331 @@
         </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="1OShD0HLb9_" role="jymVt" />
+    <node concept="2YIFZL" id="1OShD0HL7j9" role="jymVt">
+      <property role="TrG5h" value="create" />
+      <property role="od$2w" value="false" />
+      <property role="DiZV1" value="false" />
+      <node concept="37vLTG" id="1OShD0HL7ja" role="3clF46">
+        <property role="TrG5h" value="symbol" />
+        <node concept="3uibUv" id="1OShD0HL7jb" role="1tU5fm">
+          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+        </node>
+      </node>
+      <node concept="37vLTG" id="1OShD0HL7jc" role="3clF46">
+        <property role="TrG5h" value="tail" />
+        <node concept="3uibUv" id="1OShD0HLtyZ" role="1tU5fm">
+          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+          <node concept="16syzq" id="1OShD0HLw1Z" role="11_B2D">
+            <ref role="16sUi3" node="1OShD0HL7j_" resolve="T" />
+          </node>
+        </node>
+      </node>
+      <node concept="3clFbS" id="1OShD0HL7jg" role="3clF47">
+        <node concept="3cpWs8" id="1OShD0HL7jh" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0HL7ji" role="3cpWs9">
+            <property role="TrG5h" value="path" />
+            <node concept="3uibUv" id="1OShD0HL7jj" role="1tU5fm">
+              <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
+            </node>
+            <node concept="2YIFZM" id="1OShD0HL7jk" role="33vP2m">
+              <ref role="37wK5l" node="1R$Cm9qEBDL" resolve="create" />
+              <ref role="1Pybhc" node="1R$Cm9qEqLU" resolve="Path" />
+              <node concept="37vLTw" id="1OShD0HL7jl" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HL7ja" resolve="symbol" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="1OShD0HL7jm" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0HL7jn" role="3cpWs9">
+            <property role="TrG5h" value="lb" />
+            <node concept="3uibUv" id="1OShD0HL7jo" role="1tU5fm">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HM6wN" role="11_B2D">
+                <ref role="16sUi3" node="1OShD0HL7j_" resolve="T" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="1OShD0HL7jp" role="33vP2m">
+              <node concept="1pGfFk" id="1OShD0HL7jq" role="2ShVmc">
+                <ref role="37wK5l" node="3OPtF03lcrB" resolve="ListBranch" />
+                <node concept="37vLTw" id="1OShD0HL7jr" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HL7ji" resolve="path" />
+                </node>
+                <node concept="37vLTw" id="1OShD0HL_qQ" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HL7jc" resolve="tail" />
+                </node>
+                <node concept="16syzq" id="1OShD0HM6on" role="1pMfVU">
+                  <ref role="16sUi3" node="1OShD0HL7j_" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0HM7W9" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0HM836" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0HM7W7" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0HL7jc" resolve="tail" />
+            </node>
+            <node concept="liA8E" id="1OShD0HM8EB" role="2OqNvi">
+              <ref role="37wK5l" node="dfChU1lNtX" resolve="attached" />
+              <node concept="37vLTw" id="1OShD0HM8Un" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HL7jn" resolve="lb" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1OShD0HM90n" role="3cqZAp" />
+        <node concept="3clFbF" id="1OShD0HL7jw" role="3cqZAp">
+          <node concept="37vLTw" id="1OShD0HL7jx" role="3clFbG">
+            <ref role="3cqZAo" node="1OShD0HL7jn" resolve="lb" />
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="1OShD0HL7jy" role="1B3o_S" />
+      <node concept="3uibUv" id="1OShD0HL7jz" role="3clF45">
+        <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+        <node concept="16syzq" id="1OShD0HL7j$" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0HL7j_" resolve="T" />
+        </node>
+      </node>
+      <node concept="16euLQ" id="1OShD0HL7j_" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0HL7jA" role="3ztrMU">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="3qTvmN" id="1OShD0HL7jB" role="11_B2D" />
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3OPtF03lcvI" role="jymVt" />
+    <node concept="2YIFZL" id="1OShD0HGZnt" role="jymVt">
+      <property role="TrG5h" value="createCons" />
+      <node concept="37vLTG" id="1OShD0HH7Kl" role="3clF46">
+        <property role="TrG5h" value="head" />
+        <node concept="16syzq" id="1OShD0I4_hs" role="1tU5fm">
+          <ref role="16sUi3" node="1OShD0HH58K" resolve="T" />
+        </node>
+      </node>
+      <node concept="37vLTG" id="1OShD0HH8we" role="3clF46">
+        <property role="TrG5h" value="tail" />
+        <node concept="3uibUv" id="1OShD0HH909" role="1tU5fm">
+          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+          <node concept="16syzq" id="1OShD0HH9yC" role="11_B2D">
+            <ref role="16sUi3" node="1OShD0HH58K" resolve="T" />
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="1OShD0HGZnw" role="1B3o_S" />
+      <node concept="3clFbS" id="1OShD0HGZnx" role="3clF47">
+        <node concept="3cpWs8" id="1OShD0HHaVP" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0HHaVQ" role="3cpWs9">
+            <property role="TrG5h" value="cons" />
+            <node concept="3uibUv" id="1OShD0HHaVR" role="1tU5fm">
+              <ref role="3uigEE" node="3OPtF03lcvH" resolve="ListBranch.Cons" />
+              <node concept="16syzq" id="1OShD0HHaVS" role="11_B2D">
+                <ref role="16sUi3" node="1OShD0HH58K" resolve="T" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="1OShD0HHaVT" role="33vP2m">
+              <node concept="1pGfFk" id="1OShD0HHaVU" role="2ShVmc">
+                <ref role="37wK5l" node="3OPtF03lcvJ" resolve="ListBranch.Cons" />
+                <node concept="37vLTw" id="1OShD0HHaVV" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HH7Kl" resolve="head" />
+                </node>
+                <node concept="37vLTw" id="1OShD0HHaVW" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HH8we" resolve="tail" />
+                </node>
+                <node concept="16syzq" id="1OShD0HHaVX" role="1pMfVU">
+                  <ref role="16sUi3" node="1OShD0HH58K" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0HHaVY" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0HHaVZ" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0HHaW0" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0HH7Kl" resolve="head" />
+            </node>
+            <node concept="liA8E" id="1OShD0HHaW1" role="2OqNvi">
+              <ref role="37wK5l" node="dfChU1lFHl" resolve="attached" />
+              <node concept="37vLTw" id="1OShD0HHaW2" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HHaVQ" resolve="cons" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0HHaW3" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0HHaW4" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0HHaW5" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0HH8we" resolve="tail" />
+            </node>
+            <node concept="liA8E" id="1OShD0HHaW6" role="2OqNvi">
+              <ref role="37wK5l" node="dfChU1lNtX" resolve="attached" />
+              <node concept="37vLTw" id="1OShD0HHaW7" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HHaVQ" resolve="cons" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1OShD0HHaW8" role="3cqZAp" />
+        <node concept="3cpWs6" id="1OShD0HHaW9" role="3cqZAp">
+          <node concept="37vLTw" id="1OShD0HHaWa" role="3cqZAk">
+            <ref role="3cqZAo" node="1OShD0HHaVQ" resolve="cons" />
+          </node>
+        </node>
+      </node>
+      <node concept="3uibUv" id="1OShD0HH3oG" role="3clF45">
+        <ref role="3uigEE" node="3OPtF03lcvH" resolve="ListBranch.Cons" />
+        <node concept="16syzq" id="1OShD0HH6p$" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0HH58K" resolve="T" />
+        </node>
+      </node>
+      <node concept="16euLQ" id="1OShD0HH58K" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0HH58L" role="3ztrMU">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="3qUE_q" id="1OShD0HH58M" role="11_B2D">
+            <node concept="3uibUv" id="1OShD0HH58N" role="3qUE_r">
+              <ref role="3uigEE" to="jfki:~Node" resolve="Node" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1OShD0I3zFc" role="jymVt" />
+    <node concept="2YIFZL" id="1OShD0I3vRu" role="jymVt">
+      <property role="TrG5h" value="createAlias" />
+      <node concept="37vLTG" id="1OShD0I3vRv" role="3clF46">
+        <property role="TrG5h" value="var" />
+        <node concept="16syzq" id="1OShD0I8Gp0" role="1tU5fm">
+          <ref role="16sUi3" node="1OShD0I3vRZ" resolve="T" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="1OShD0I3vR_" role="1B3o_S" />
+      <node concept="3clFbS" id="1OShD0I3vRA" role="3clF47">
+        <node concept="3cpWs8" id="1OShD0I3vRB" role="3cqZAp">
+          <node concept="3cpWsn" id="1OShD0I3vRC" role="3cpWs9">
+            <property role="TrG5h" value="alias" />
+            <node concept="3uibUv" id="1OShD0I3JjP" role="1tU5fm">
+              <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+              <node concept="16syzq" id="1OShD0I6itJ" role="11_B2D">
+                <ref role="16sUi3" node="1OShD0I3vRZ" resolve="T" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="1OShD0I3vRF" role="33vP2m">
+              <node concept="1pGfFk" id="1OShD0I3vRG" role="2ShVmc">
+                <ref role="37wK5l" node="1OShD0I20qW" resolve="ListBranch.Alias" />
+                <node concept="37vLTw" id="1OShD0I3vRH" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I3vRv" resolve="var" />
+                </node>
+                <node concept="16syzq" id="1OShD0I3vRJ" role="1pMfVU">
+                  <ref role="16sUi3" node="1OShD0I3vRZ" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0I3vRK" role="3cqZAp">
+          <node concept="2OqwBi" id="1OShD0I3vRL" role="3clFbG">
+            <node concept="37vLTw" id="1OShD0I3vRM" role="2Oq$k0">
+              <ref role="3cqZAo" node="1OShD0I3vRv" resolve="var" />
+            </node>
+            <node concept="liA8E" id="1OShD0I3vRN" role="2OqNvi">
+              <ref role="37wK5l" node="dfChU1m0qM" resolve="attached" />
+              <node concept="37vLTw" id="1OShD0I3vRO" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0I3vRC" resolve="alias" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1OShD0I3vRU" role="3cqZAp" />
+        <node concept="3cpWs6" id="1OShD0I3vRV" role="3cqZAp">
+          <node concept="37vLTw" id="1OShD0I3vRW" role="3cqZAk">
+            <ref role="3cqZAo" node="1OShD0I3vRC" resolve="alias" />
+          </node>
+        </node>
+      </node>
+      <node concept="3uibUv" id="1OShD0I40pS" role="3clF45">
+        <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+        <node concept="16syzq" id="1OShD0I42Yn" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0I3vRZ" resolve="T" />
+        </node>
+      </node>
+      <node concept="16euLQ" id="1OShD0I3vRZ" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0IdDmI" role="3ztrMU">
+          <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="1OShD0HRYaK" role="jymVt" />
+    <node concept="2YIFZL" id="1OShD0HS45f" role="jymVt">
+      <property role="TrG5h" value="createList" />
+      <node concept="37vLTG" id="1OShD0HSc64" role="3clF46">
+        <property role="TrG5h" value="elements" />
+        <node concept="8X2XB" id="1OShD0HSHQT" role="1tU5fm">
+          <node concept="3uibUv" id="1OShD0HSc66" role="8Xvag">
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+            <node concept="3qTvmN" id="1OShD0I1cw7" role="11_B2D" />
+          </node>
+        </node>
+      </node>
+      <node concept="3uibUv" id="1OShD0HS7CO" role="3clF45">
+        <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+        <node concept="16syzq" id="1OShD0HSE4C" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0HSa_P" resolve="T" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="1OShD0HS45i" role="1B3o_S" />
+      <node concept="3clFbS" id="1OShD0HS45j" role="3clF47">
+        <node concept="3SKdUt" id="1OShD0HT1H6" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0HT1H7" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="1OShD0HSd7a" role="3cqZAp">
+          <node concept="10QFUN" id="1OShD0HSXZ6" role="3clFbG">
+            <node concept="1rXfSq" id="1OShD0HSXZ3" role="10QFUP">
+              <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
+              <node concept="37vLTw" id="1OShD0HSXZ4" role="37wK5m">
+                <ref role="3cqZAo" node="1OShD0HSc64" resolve="elements" />
+              </node>
+              <node concept="3cmrfG" id="1OShD0HSXZ5" role="37wK5m">
+                <property role="3cmrfH" value="0" />
+              </node>
+            </node>
+            <node concept="3uibUv" id="1OShD0HSYLa" role="10QFUM">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HSYLb" role="11_B2D">
+                <ref role="16sUi3" node="1OShD0HSa_P" resolve="T" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="16euLQ" id="1OShD0HSa_P" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0HSa_Q" role="3ztrMU">
+          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="3qUE_q" id="1OShD0HSa_R" role="11_B2D">
+            <node concept="3uibUv" id="1OShD0HSa_S" role="3qUE_r">
+              <ref role="3uigEE" to="jfki:~Node" resolve="Node" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
     <node concept="2tJIrI" id="3OPtF03lcoK" role="jymVt" />
     <node concept="2YIFZL" id="3OPtF03lcoL" role="jymVt">
       <property role="TrG5h" value="createList" />
       <property role="od$2w" value="false" />
       <property role="DiZV1" value="false" />
-      <node concept="37vLTG" id="3OPtF03lcoM" role="3clF46">
-        <property role="TrG5h" value="parentPath" />
-        <node concept="3uibUv" id="3OPtF03lcoN" role="1tU5fm">
-          <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-        </node>
-      </node>
       <node concept="37vLTG" id="3OPtF03lcoO" role="3clF46">
         <property role="TrG5h" value="elements" />
         <node concept="10Q1$e" id="3OPtF03lcoP" role="1tU5fm">
-          <node concept="3uibUv" id="3OPtF03lcoQ" role="10Q1$1">
-            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="16syzq" id="1OShD0I4Okr" role="10Q1$1">
+            <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
           </node>
         </node>
       </node>
@@ -8634,9 +9889,6 @@
             <node concept="3cpWs8" id="3OPtF03lcoW" role="3cqZAp">
               <node concept="3cpWsn" id="3OPtF03lcoX" role="3cpWs9">
                 <property role="TrG5h" value="head" />
-                <node concept="3uibUv" id="3OPtF03lcoY" role="1tU5fm">
-                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
-                </node>
                 <node concept="AH0OO" id="3OPtF03lcoZ" role="33vP2m">
                   <node concept="37vLTw" id="3OPtF03lcp0" role="AHEQo">
                     <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
@@ -8645,126 +9897,61 @@
                     <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
                   </node>
                 </node>
+                <node concept="16syzq" id="1OShD0I4M20" role="1tU5fm">
+                  <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
+                </node>
               </node>
             </node>
-            <node concept="3cpWs8" id="3OPtF03lcp2" role="3cqZAp">
-              <node concept="3cpWsn" id="3OPtF03lcp3" role="3cpWs9">
-                <property role="TrG5h" value="cons" />
-                <node concept="3uibUv" id="3OPtF03lcp4" role="1tU5fm">
-                  <ref role="3uigEE" node="3OPtF03lcvH" resolve="ListBranch.Cons" />
-                  <node concept="16syzq" id="3OPtF03lcp5" role="11_B2D">
+            <node concept="3cpWs8" id="1OShD0HG9s1" role="3cqZAp">
+              <node concept="3cpWsn" id="1OShD0HG9s2" role="3cpWs9">
+                <property role="TrG5h" value="tail" />
+                <node concept="3uibUv" id="1OShD0HG9rK" role="1tU5fm">
+                  <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+                  <node concept="16syzq" id="1OShD0HG9rN" role="11_B2D">
                     <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
                   </node>
                 </node>
-                <node concept="2ShNRf" id="3OPtF03lcp6" role="33vP2m">
-                  <node concept="1pGfFk" id="3OPtF03lcp7" role="2ShVmc">
-                    <ref role="37wK5l" node="3OPtF03lcvJ" resolve="ListBranch.Cons" />
-                    <node concept="37vLTw" id="3OPtF03lcp8" role="37wK5m">
-                      <ref role="3cqZAo" node="3OPtF03lcoX" resolve="head" />
-                    </node>
-                    <node concept="37vLTw" id="3OPtF03lcp9" role="37wK5m">
+                <node concept="2YIFZM" id="1OShD0HG9s3" role="33vP2m">
+                  <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                  <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
+                  <node concept="37vLTw" id="1OShD0HG9s5" role="37wK5m">
+                    <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+                  </node>
+                  <node concept="2$rviw" id="1OShD0HG9s6" role="37wK5m">
+                    <node concept="37vLTw" id="1OShD0HG9s7" role="2$L3a6">
                       <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
                     </node>
-                    <node concept="2YIFZM" id="3OPtF03lcpa" role="37wK5m">
-                      <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
-                      <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
-                      <node concept="37vLTw" id="3OPtF03lcpb" role="37wK5m">
-                        <ref role="3cqZAo" node="3OPtF03lcoM" resolve="parentPath" />
-                      </node>
-                      <node concept="37vLTw" id="3OPtF03lcpc" role="37wK5m">
-                        <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
-                      </node>
-                      <node concept="2$rviw" id="3OPtF03lcpd" role="37wK5m">
-                        <node concept="37vLTw" id="3OPtF03lcpe" role="2$L3a6">
-                          <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
-                        </node>
-                      </node>
-                      <node concept="16syzq" id="3OPtF03lcpf" role="3PaCim">
-                        <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
-                      </node>
-                    </node>
-                    <node concept="16syzq" id="3OPtF03lcpg" role="1pMfVU">
-                      <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
-                    </node>
+                  </node>
+                  <node concept="16syzq" id="1OShD0HG9s8" role="3PaCim">
+                    <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3clFbH" id="3OPtF03lcph" role="3cqZAp" />
-            <node concept="3SKdUt" id="3OPtF03lcpi" role="3cqZAp">
-              <node concept="3SKdUq" id="3OPtF03lcpj" role="3SKWNk">
-                <property role="3SKdUp" value="TODO: this smells" />
-              </node>
-            </node>
-            <node concept="3clFbJ" id="3OPtF03lcpk" role="3cqZAp">
-              <node concept="3clFbS" id="3OPtF03lcpl" role="3clFbx">
-                <node concept="3clFbF" id="3OPtF03lcpm" role="3cqZAp">
-                  <node concept="2OqwBi" id="3OPtF03lcpn" role="3clFbG">
-                    <node concept="liA8E" id="3OPtF03lcpo" role="2OqNvi">
-                      <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                      <node concept="37vLTw" id="3OPtF03lcpp" role="37wK5m">
-                        <ref role="3cqZAo" node="3OPtF03lcoM" resolve="parentPath" />
-                      </node>
-                    </node>
-                    <node concept="2OqwBi" id="3OPtF03lcpq" role="2Oq$k0">
-                      <node concept="1eOMI4" id="3OPtF03lcpr" role="2Oq$k0">
-                        <node concept="10QFUN" id="3OPtF03lcps" role="1eOMHV">
-                          <node concept="3uibUv" id="3OPtF03lcpt" role="10QFUM">
-                            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                          </node>
-                          <node concept="37vLTw" id="3OPtF03lcpu" role="10QFUP">
-                            <ref role="3cqZAo" node="3OPtF03lcoX" resolve="head" />
-                          </node>
-                        </node>
-                      </node>
-                      <node concept="liA8E" id="3OPtF03lcpv" role="2OqNvi">
-                        <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="2ZW3vV" id="3OPtF03lcpw" role="3clFbw">
-                <node concept="3uibUv" id="3OPtF03lcpx" role="2ZW6by">
-                  <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcpy" role="2ZW6bz">
+            <node concept="3cpWs6" id="1OShD0HHenx" role="3cqZAp">
+              <node concept="1rXfSq" id="1OShD0HHH8v" role="3cqZAk">
+                <ref role="37wK5l" node="1OShD0HGZnt" resolve="createCons" />
+                <node concept="37vLTw" id="1OShD0HHIqU" role="37wK5m">
                   <ref role="3cqZAo" node="3OPtF03lcoX" resolve="head" />
                 </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="3OPtF03lcpz" role="3cqZAp" />
-            <node concept="3clFbF" id="3OPtF03lcp$" role="3cqZAp">
-              <node concept="2OqwBi" id="3OPtF03lcp_" role="3clFbG">
-                <node concept="2OqwBi" id="3OPtF03lcpA" role="2Oq$k0">
-                  <node concept="37vLTw" id="3OPtF03lcpB" role="2Oq$k0">
-                    <ref role="3cqZAo" node="3OPtF03lcp3" resolve="cons" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lcpC" role="2OqNvi">
-                    <ref role="37wK5l" node="3OPtF03lcw2" resolve="path" />
-                  </node>
+                <node concept="37vLTw" id="1OShD0HHKku" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0HG9s2" resolve="tail" />
                 </node>
-                <node concept="liA8E" id="3OPtF03lcpD" role="2OqNvi">
-                  <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                  <node concept="37vLTw" id="3OPtF03lcpE" role="37wK5m">
-                    <ref role="3cqZAo" node="3OPtF03lcoM" resolve="parentPath" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3cpWs6" id="3OPtF03lcpF" role="3cqZAp">
-              <node concept="37vLTw" id="3OPtF03lcpG" role="3cqZAk">
-                <ref role="3cqZAo" node="3OPtF03lcp3" resolve="cons" />
               </node>
             </node>
             <node concept="3clFbH" id="3OPtF03lcpH" role="3cqZAp" />
           </node>
           <node concept="3eOVzh" id="3OPtF03lcpI" role="3clFbw">
-            <node concept="2OqwBi" id="3OPtF03lcpJ" role="3uHU7w">
-              <node concept="37vLTw" id="3OPtF03lcpK" role="2Oq$k0">
-                <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+            <node concept="3cpWsd" id="1OShD0IbKki" role="3uHU7w">
+              <node concept="3cmrfG" id="1OShD0IbKlN" role="3uHU7w">
+                <property role="3cmrfH" value="1" />
+              </node>
+              <node concept="2OqwBi" id="3OPtF03lcpJ" role="3uHU7B">
+                <node concept="37vLTw" id="3OPtF03lcpK" role="2Oq$k0">
+                  <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+                </node>
+                <node concept="1Rwk04" id="3OPtF03lcpL" role="2OqNvi" />
               </node>
-              <node concept="1Rwk04" id="3OPtF03lcpL" role="2OqNvi" />
             </node>
             <node concept="37vLTw" id="3OPtF03lcpM" role="3uHU7B">
               <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
@@ -8791,30 +9978,123 @@
                   </node>
                 </node>
               </node>
-              <node concept="3clFbF" id="3OPtF03lcpW" role="3cqZAp">
-                <node concept="2OqwBi" id="3OPtF03lcpX" role="3clFbG">
-                  <node concept="2OqwBi" id="3OPtF03lcpY" role="2Oq$k0">
-                    <node concept="37vLTw" id="3OPtF03lcpZ" role="2Oq$k0">
-                      <ref role="3cqZAo" node="3OPtF03lcpQ" resolve="nil" />
-                    </node>
-                    <node concept="liA8E" id="3OPtF03lcq0" role="2OqNvi">
-                      <ref role="37wK5l" node="3OPtF03lcyT" resolve="path" />
-                    </node>
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lcq1" role="2OqNvi">
-                    <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                    <node concept="37vLTw" id="3OPtF03lcq2" role="37wK5m">
-                      <ref role="3cqZAo" node="3OPtF03lcoM" resolve="parentPath" />
-                    </node>
-                  </node>
-                </node>
-              </node>
               <node concept="3cpWs6" id="3OPtF03lcq3" role="3cqZAp">
                 <node concept="37vLTw" id="3OPtF03lcq4" role="3cqZAk">
                   <ref role="3cqZAo" node="3OPtF03lcpQ" resolve="nil" />
                 </node>
               </node>
-              <node concept="3clFbH" id="3OPtF03lcq5" role="3cqZAp" />
+            </node>
+          </node>
+          <node concept="3eNFk2" id="1OShD0IbNgJ" role="3eNLev">
+            <node concept="3clFbS" id="1OShD0IbNgL" role="3eOfB_">
+              <node concept="3cpWs8" id="1OShD0IbQqD" role="3cqZAp">
+                <node concept="3cpWsn" id="1OShD0IbQqE" role="3cpWs9">
+                  <property role="TrG5h" value="last" />
+                  <node concept="AH0OO" id="1OShD0IbQqF" role="33vP2m">
+                    <node concept="37vLTw" id="1OShD0IbQqG" role="AHEQo">
+                      <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
+                    </node>
+                    <node concept="37vLTw" id="1OShD0IbQqH" role="AHHXb">
+                      <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+                    </node>
+                  </node>
+                  <node concept="16syzq" id="1OShD0IbQqI" role="1tU5fm">
+                    <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbJ" id="1OShD0IbW7W" role="3cqZAp">
+                <node concept="3clFbS" id="1OShD0IbW7Y" role="3clFbx">
+                  <node concept="3cpWs6" id="1OShD0IchsR" role="3cqZAp">
+                    <node concept="10QFUN" id="1OShD0Iehgy" role="3cqZAk">
+                      <node concept="3uibUv" id="1OShD0Iehgs" role="10QFUM">
+                        <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+                        <node concept="16syzq" id="1OShD0Iehgt" role="11_B2D">
+                          <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
+                        </node>
+                      </node>
+                      <node concept="1rXfSq" id="1OShD0Iehgu" role="10QFUP">
+                        <ref role="37wK5l" node="1OShD0I3vRu" resolve="createAlias" />
+                        <node concept="10QFUN" id="1OShD0Iehgv" role="37wK5m">
+                          <node concept="3uibUv" id="1OShD0Iehgw" role="10QFUM">
+                            <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+                          </node>
+                          <node concept="37vLTw" id="1OShD0Iehgx" role="10QFUP">
+                            <ref role="3cqZAo" node="1OShD0IbQqE" resolve="last" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbH" id="1OShD0Ic6Ap" role="3cqZAp" />
+                </node>
+                <node concept="2ZW3vV" id="1OShD0IbXxR" role="3clFbw">
+                  <node concept="3uibUv" id="1OShD0IbXTQ" role="2ZW6by">
+                    <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
+                  </node>
+                  <node concept="37vLTw" id="1OShD0IbXfa" role="2ZW6bz">
+                    <ref role="3cqZAo" node="1OShD0IbQqE" resolve="last" />
+                  </node>
+                </node>
+                <node concept="9aQIb" id="1OShD0Ic2Cw" role="9aQIa">
+                  <node concept="3clFbS" id="1OShD0Ic2Cx" role="9aQI4">
+                    <node concept="3cpWs8" id="1OShD0IbQqJ" role="3cqZAp">
+                      <node concept="3cpWsn" id="1OShD0IbQqK" role="3cpWs9">
+                        <property role="TrG5h" value="tail" />
+                        <node concept="3uibUv" id="1OShD0IbQqL" role="1tU5fm">
+                          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+                          <node concept="16syzq" id="1OShD0IbQqM" role="11_B2D">
+                            <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
+                          </node>
+                        </node>
+                        <node concept="2YIFZM" id="1OShD0IbQqN" role="33vP2m">
+                          <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                          <ref role="37wK5l" node="3OPtF03lcoL" resolve="createList" />
+                          <node concept="37vLTw" id="1OShD0IbQqO" role="37wK5m">
+                            <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+                          </node>
+                          <node concept="2$rviw" id="1OShD0IbQqP" role="37wK5m">
+                            <node concept="37vLTw" id="1OShD0IbQqQ" role="2$L3a6">
+                              <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
+                            </node>
+                          </node>
+                          <node concept="16syzq" id="1OShD0IbQqR" role="3PaCim">
+                            <ref role="16sUi3" node="3OPtF03lcq9" resolve="T" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="3cpWs6" id="1OShD0IbQqS" role="3cqZAp">
+                      <node concept="1rXfSq" id="1OShD0IbQqT" role="3cqZAk">
+                        <ref role="37wK5l" node="1OShD0HGZnt" resolve="createCons" />
+                        <node concept="37vLTw" id="1OShD0IbQqU" role="37wK5m">
+                          <ref role="3cqZAo" node="1OShD0IbQqE" resolve="last" />
+                        </node>
+                        <node concept="37vLTw" id="1OShD0IbQqV" role="37wK5m">
+                          <ref role="3cqZAo" node="1OShD0IbQqK" resolve="tail" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3clFbH" id="1OShD0IbRq3" role="3cqZAp" />
+            </node>
+            <node concept="3clFbC" id="1OShD0Iccl4" role="3eO9$A">
+              <node concept="37vLTw" id="1OShD0IbOGr" role="3uHU7B">
+                <ref role="3cqZAo" node="3OPtF03lcoR" resolve="headIdx" />
+              </node>
+              <node concept="3cpWsd" id="1OShD0Icelx" role="3uHU7w">
+                <node concept="3cmrfG" id="1OShD0Icen2" role="3uHU7w">
+                  <property role="3cmrfH" value="1" />
+                </node>
+                <node concept="2OqwBi" id="1OShD0IbOGo" role="3uHU7B">
+                  <node concept="37vLTw" id="1OShD0IbOGp" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3OPtF03lcoO" resolve="elements" />
+                  </node>
+                  <node concept="1Rwk04" id="1OShD0IbOGq" role="2OqNvi" />
+                </node>
+              </node>
             </node>
           </node>
         </node>
@@ -8839,228 +10119,6 @@
       </node>
     </node>
     <node concept="2tJIrI" id="3OPtF03lcqd" role="jymVt" />
-    <node concept="2YIFZL" id="3OPtF03lcqe" role="jymVt">
-      <property role="TrG5h" value="prependPath" />
-      <property role="IEkAT" value="false" />
-      <property role="DiZV1" value="false" />
-      <property role="od$2w" value="false" />
-      <node concept="3clFbS" id="3OPtF03lcqf" role="3clF47">
-        <node concept="3clFbJ" id="3OPtF03lcqg" role="3cqZAp">
-          <node concept="3clFbS" id="3OPtF03lcqh" role="3clFbx">
-            <node concept="3cpWs8" id="3OPtF03lcqi" role="3cqZAp">
-              <node concept="3cpWsn" id="3OPtF03lcqj" role="3cpWs9">
-                <property role="TrG5h" value="cons" />
-                <node concept="3uibUv" id="3OPtF03lcqk" role="1tU5fm">
-                  <ref role="3uigEE" node="3OPtF03lcvH" resolve="ListBranch.Cons" />
-                  <node concept="16syzq" id="3OPtF03lcql" role="11_B2D">
-                    <ref role="16sUi3" node="3OPtF03lcrx" resolve="T" />
-                  </node>
-                </node>
-                <node concept="10QFUN" id="3OPtF03lcqm" role="33vP2m">
-                  <node concept="3uibUv" id="3OPtF03lcqn" role="10QFUM">
-                    <ref role="3uigEE" node="3OPtF03lcvH" resolve="ListBranch.Cons" />
-                    <node concept="16syzq" id="3OPtF03lcqo" role="11_B2D">
-                      <ref role="16sUi3" node="3OPtF03lcrx" resolve="T" />
-                    </node>
-                  </node>
-                  <node concept="37vLTw" id="3OPtF03lcqp" role="10QFUP">
-                    <ref role="3cqZAo" node="3OPtF03lcrr" resolve="list" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3cpWs8" id="3OPtF03lcqq" role="3cqZAp">
-              <node concept="3cpWsn" id="3OPtF03lcqr" role="3cpWs9">
-                <property role="TrG5h" value="head" />
-                <node concept="16syzq" id="3OPtF03lcqs" role="1tU5fm">
-                  <ref role="16sUi3" node="3OPtF03lcrx" resolve="T" />
-                </node>
-                <node concept="2OqwBi" id="3OPtF03lcqt" role="33vP2m">
-                  <node concept="37vLTw" id="3OPtF03lcqu" role="2Oq$k0">
-                    <ref role="3cqZAo" node="3OPtF03lcqj" resolve="cons" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lcqv" role="2OqNvi">
-                    <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="3OPtF03lcqw" role="3cqZAp" />
-            <node concept="3SKdUt" id="3OPtF03lcqx" role="3cqZAp">
-              <node concept="3SKdUq" id="3OPtF03lcqy" role="3SKWNk">
-                <property role="3SKdUp" value="TODO: this smells" />
-              </node>
-            </node>
-            <node concept="3clFbJ" id="3OPtF03lcqz" role="3cqZAp">
-              <node concept="3clFbS" id="3OPtF03lcq$" role="3clFbx">
-                <node concept="3clFbF" id="3OPtF03lcq_" role="3cqZAp">
-                  <node concept="2OqwBi" id="3OPtF03lcqA" role="3clFbG">
-                    <node concept="liA8E" id="3OPtF03lcqB" role="2OqNvi">
-                      <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                      <node concept="37vLTw" id="3OPtF03lcqC" role="37wK5m">
-                        <ref role="3cqZAo" node="3OPtF03lcru" resolve="parentPath" />
-                      </node>
-                    </node>
-                    <node concept="2OqwBi" id="3OPtF03lcqD" role="2Oq$k0">
-                      <node concept="1eOMI4" id="3OPtF03lcqE" role="2Oq$k0">
-                        <node concept="10QFUN" id="3OPtF03lcqF" role="1eOMHV">
-                          <node concept="3uibUv" id="3OPtF03lcqG" role="10QFUM">
-                            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                          </node>
-                          <node concept="37vLTw" id="3OPtF03lcqH" role="10QFUP">
-                            <ref role="3cqZAo" node="3OPtF03lcqr" resolve="head" />
-                          </node>
-                        </node>
-                      </node>
-                      <node concept="liA8E" id="3OPtF03lcqI" role="2OqNvi">
-                        <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="2ZW3vV" id="3OPtF03lcqJ" role="3clFbw">
-                <node concept="3uibUv" id="3OPtF03lcqK" role="2ZW6by">
-                  <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcqL" role="2ZW6bz">
-                  <ref role="3cqZAo" node="3OPtF03lcqr" resolve="head" />
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="3OPtF03lcqM" role="3cqZAp" />
-            <node concept="3clFbF" id="3OPtF03lcqN" role="3cqZAp">
-              <node concept="2OqwBi" id="3OPtF03lcqO" role="3clFbG">
-                <node concept="37vLTw" id="3OPtF03lcqP" role="2Oq$k0">
-                  <ref role="3cqZAo" node="3OPtF03lcqj" resolve="cons" />
-                </node>
-                <node concept="liA8E" id="3OPtF03lcqQ" role="2OqNvi">
-                  <ref role="37wK5l" node="3OPtF03lcyr" resolve="prependPath" />
-                  <node concept="37vLTw" id="3OPtF03lcqR" role="37wK5m">
-                    <ref role="3cqZAo" node="3OPtF03lcru" resolve="parentPath" />
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbF" id="3OPtF03lcqS" role="3cqZAp">
-              <node concept="1rXfSq" id="3OPtF03lcqT" role="3clFbG">
-                <ref role="37wK5l" node="3OPtF03lcqe" resolve="prependPath" />
-                <node concept="2OqwBi" id="3OPtF03lcqU" role="37wK5m">
-                  <node concept="37vLTw" id="3OPtF03lcqV" role="2Oq$k0">
-                    <ref role="3cqZAo" node="3OPtF03lcqj" resolve="cons" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lcqW" role="2OqNvi">
-                    <ref role="37wK5l" node="3OPtF03lcyf" resolve="tail" />
-                  </node>
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcqX" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcru" resolve="parentPath" />
-                </node>
-              </node>
-            </node>
-            <node concept="3clFbH" id="3OPtF03lcqY" role="3cqZAp" />
-          </node>
-          <node concept="3eNFk2" id="3OPtF03lcqZ" role="3eNLev">
-            <node concept="3clFbS" id="3OPtF03lcr0" role="3eOfB_">
-              <node concept="3cpWs8" id="3OPtF03lcr1" role="3cqZAp">
-                <node concept="3cpWsn" id="3OPtF03lcr2" role="3cpWs9">
-                  <property role="TrG5h" value="nil" />
-                  <node concept="3uibUv" id="3OPtF03lcr3" role="1tU5fm">
-                    <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
-                    <node concept="16syzq" id="3OPtF03lcr4" role="11_B2D">
-                      <ref role="16sUi3" node="3OPtF03lcrx" resolve="T" />
-                    </node>
-                  </node>
-                  <node concept="2OqwBi" id="3OPtF03lcr5" role="33vP2m">
-                    <node concept="37vLTw" id="3OPtF03lcr6" role="2Oq$k0">
-                      <ref role="3cqZAo" node="3OPtF03lcrr" resolve="list" />
-                    </node>
-                    <node concept="liA8E" id="3OPtF03lcr7" role="2OqNvi">
-                      <ref role="37wK5l" node="3OPtF03lcsv" resolve="copyRecursively" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="3clFbF" id="3OPtF03lcr8" role="3cqZAp">
-                <node concept="2OqwBi" id="3OPtF03lcr9" role="3clFbG">
-                  <node concept="37vLTw" id="3OPtF03lcra" role="2Oq$k0">
-                    <ref role="3cqZAo" node="3OPtF03lcr2" resolve="nil" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lcrb" role="2OqNvi">
-                    <ref role="37wK5l" node="3OPtF03lcuT" resolve="prependPath" />
-                    <node concept="37vLTw" id="3OPtF03lcrc" role="37wK5m">
-                      <ref role="3cqZAo" node="3OPtF03lcru" resolve="parentPath" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-              <node concept="3clFbH" id="3OPtF03lcrd" role="3cqZAp" />
-            </node>
-            <node concept="2OqwBi" id="3OPtF03lcre" role="3eO9$A">
-              <node concept="37vLTw" id="3OPtF03lcrf" role="2Oq$k0">
-                <ref role="3cqZAo" node="3OPtF03lcrr" resolve="list" />
-              </node>
-              <node concept="liA8E" id="3OPtF03lcrg" role="2OqNvi">
-                <ref role="37wK5l" node="3OPtF03lcvc" resolve="isNil" />
-              </node>
-            </node>
-          </node>
-          <node concept="2OqwBi" id="3OPtF03lcrh" role="3clFbw">
-            <node concept="37vLTw" id="3OPtF03lcri" role="2Oq$k0">
-              <ref role="3cqZAo" node="3OPtF03lcrr" resolve="list" />
-            </node>
-            <node concept="liA8E" id="3OPtF03lcrj" role="2OqNvi">
-              <ref role="37wK5l" node="3OPtF03lcv5" resolve="isCons" />
-            </node>
-          </node>
-          <node concept="9aQIb" id="3OPtF03lcrk" role="9aQIa">
-            <node concept="3clFbS" id="3OPtF03lcrl" role="9aQI4">
-              <node concept="3SKdUt" id="3OPtF03lcrm" role="3cqZAp">
-                <node concept="3SKdUq" id="3OPtF03lcrn" role="3SKWNk">
-                  <property role="3SKdUp" value="FIXME implement me" />
-                </node>
-              </node>
-              <node concept="YS8fn" id="3OPtF03lcro" role="3cqZAp">
-                <node concept="2ShNRf" id="3OPtF03lcrp" role="YScLw">
-                  <node concept="1pGfFk" id="3OPtF03lcrq" role="2ShVmc">
-                    <ref role="37wK5l" to="e2lb:~UnsupportedOperationException.&lt;init&gt;()" resolve="UnsupportedOperationException" />
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="37vLTG" id="3OPtF03lcrr" role="3clF46">
-        <property role="TrG5h" value="list" />
-        <node concept="3uibUv" id="3OPtF03lcrs" role="1tU5fm">
-          <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
-          <node concept="16syzq" id="3OPtF03lcrt" role="11_B2D">
-            <ref role="16sUi3" node="3OPtF03lcrx" resolve="T" />
-          </node>
-        </node>
-      </node>
-      <node concept="37vLTG" id="3OPtF03lcru" role="3clF46">
-        <property role="TrG5h" value="parentPath" />
-        <node concept="3uibUv" id="3OPtF03lcrv" role="1tU5fm">
-          <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="3OPtF03lcrw" role="3clF45" />
-      <node concept="16euLQ" id="3OPtF03lcrx" role="16eVyc">
-        <property role="TrG5h" value="T" />
-        <node concept="3uibUv" id="3OPtF03lcry" role="3ztrMU">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
-          <node concept="3qUE_q" id="3OPtF03lcrz" role="11_B2D">
-            <node concept="3uibUv" id="3OPtF03lcr$" role="3qUE_r">
-              <ref role="3uigEE" to="jfki:~Node" resolve="Node" />
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="3Tm6S6" id="3OPtF03lcr_" role="1B3o_S" />
-    </node>
-    <node concept="2tJIrI" id="3OPtF03lcrA" role="jymVt" />
     <node concept="3clFbW" id="3OPtF03lcrB" role="jymVt">
       <node concept="3cqZAl" id="3OPtF03lcrC" role="3clF45" />
       <node concept="3clFbS" id="3OPtF03lcrD" role="3clF47">
@@ -9145,8 +10203,8 @@
       </node>
       <node concept="37vLTG" id="3OPtF03lcsa" role="3clF46">
         <property role="TrG5h" value="value" />
-        <node concept="3uibUv" id="3OPtF03lcsb" role="1tU5fm">
-          <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+        <node concept="16syzq" id="1OShD0I4G43" role="1tU5fm">
+          <ref role="16sUi3" node="3OPtF03lc_W" resolve="T" />
         </node>
       </node>
       <node concept="37vLTG" id="3OPtF03lcsc" role="3clF46">
@@ -9192,6 +10250,47 @@
         </node>
       </node>
     </node>
+    <node concept="3clFbW" id="1OShD0I2Mcp" role="jymVt">
+      <node concept="3cqZAl" id="1OShD0I2Mcq" role="3clF45" />
+      <node concept="3clFbS" id="1OShD0I2Mcr" role="3clF47">
+        <node concept="XkiVB" id="1OShD0I2Mcs" role="3cqZAp">
+          <ref role="37wK5l" node="1msb0mq9JZ8" resolve="Branch" />
+          <node concept="37vLTw" id="1OShD0I2Mct" role="37wK5m">
+            <ref role="3cqZAo" node="1OShD0I2Mc_" resolve="symbolPath" />
+          </node>
+          <node concept="10QFUN" id="1OShD0I2Mcu" role="37wK5m">
+            <node concept="10Q1$e" id="1OShD0I2Mcv" role="10QFUM">
+              <node concept="16syzq" id="1OShD0I2Mcw" role="10Q1$1">
+                <ref role="16sUi3" node="3OPtF03lc_W" resolve="T" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="1OShD0I2Mcx" role="10QFUP">
+              <node concept="3g6Rrh" id="1OShD0I2Mcy" role="2ShVmc">
+                <node concept="37vLTw" id="1OShD0I2UGM" role="3g7hyw">
+                  <ref role="3cqZAo" node="1OShD0I2RTL" resolve="value" />
+                </node>
+                <node concept="3uibUv" id="1OShD0I2Mcz" role="3g7fb8">
+                  <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3Tmbuc" id="1OShD0I2Mc$" role="1B3o_S" />
+      <node concept="37vLTG" id="1OShD0I2Mc_" role="3clF46">
+        <property role="TrG5h" value="symbolPath" />
+        <node concept="3uibUv" id="1OShD0I2McA" role="1tU5fm">
+          <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
+        </node>
+      </node>
+      <node concept="37vLTG" id="1OShD0I2RTL" role="3clF46">
+        <property role="TrG5h" value="value" />
+        <node concept="16syzq" id="1OShD0I8Lez" role="1tU5fm">
+          <ref role="16sUi3" node="3OPtF03lc_W" resolve="T" />
+        </node>
+      </node>
+    </node>
     <node concept="2tJIrI" id="3OPtF03lcsu" role="jymVt" />
     <node concept="3clFb_" id="3OPtF03lcsv" role="jymVt">
       <property role="1EzhhJ" value="false" />
@@ -9239,48 +10338,28 @@
             </node>
           </node>
         </node>
-        <node concept="3cpWs8" id="3OPtF03lcsL" role="3cqZAp">
-          <node concept="3cpWsn" id="3OPtF03lcsM" role="3cpWs9">
-            <property role="TrG5h" value="path" />
-            <node concept="3uibUv" id="3OPtF03lcsN" role="1tU5fm">
-              <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-            </node>
-            <node concept="2YIFZM" id="3OPtF03lcsO" role="33vP2m">
-              <ref role="37wK5l" node="1R$Cm9qEBDL" resolve="create" />
-              <ref role="1Pybhc" node="1R$Cm9qEqLU" resolve="Path" />
-              <node concept="2OqwBi" id="3OPtF03lcsP" role="37wK5m">
-                <node concept="1rXfSq" id="3OPtF03lcsQ" role="2Oq$k0">
-                  <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
-                </node>
-                <node concept="liA8E" id="3OPtF03lcsR" role="2OqNvi">
-                  <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                </node>
-              </node>
-            </node>
+        <node concept="3SKdUt" id="1OShD0HMxhe" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0HMy4r" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
           </node>
         </node>
-        <node concept="3clFbF" id="3OPtF03lcsS" role="3cqZAp">
-          <node concept="1rXfSq" id="3OPtF03lcsT" role="3clFbG">
-            <ref role="37wK5l" node="3OPtF03lcqe" resolve="prependPath" />
-            <node concept="37vLTw" id="3OPtF03lcsU" role="37wK5m">
-              <ref role="3cqZAo" node="3OPtF03lcsA" resolve="copy" />
-            </node>
-            <node concept="37vLTw" id="3OPtF03lcsV" role="37wK5m">
-              <ref role="3cqZAo" node="3OPtF03lcsM" resolve="path" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="3OPtF03lcsW" role="3cqZAp">
-          <node concept="2ShNRf" id="3OPtF03lcsX" role="3clFbG">
-            <node concept="1pGfFk" id="3OPtF03lcsY" role="2ShVmc">
-              <ref role="37wK5l" node="3OPtF03lcrB" resolve="ListBranch" />
-              <node concept="37vLTw" id="3OPtF03lcsZ" role="37wK5m">
-                <ref role="3cqZAo" node="3OPtF03lcsM" resolve="path" />
+        <node concept="3clFbF" id="1OShD0HMciU" role="3cqZAp">
+          <node concept="10QFUN" id="1OShD0HMtpI" role="3clFbG">
+            <node concept="1rXfSq" id="1OShD0HMtpF" role="10QFUP">
+              <ref role="37wK5l" node="1OShD0HL7j9" resolve="create" />
+              <node concept="1rXfSq" id="1OShD0HMtpG" role="37wK5m">
+                <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
               </node>
-              <node concept="37vLTw" id="3OPtF03lct0" role="37wK5m">
+              <node concept="37vLTw" id="1OShD0HMtpH" role="37wK5m">
                 <ref role="3cqZAo" node="3OPtF03lcsA" resolve="copy" />
               </node>
             </node>
+            <node concept="3uibUv" id="1OShD0HMuvV" role="10QFUM">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HMuvW" role="11_B2D">
+                <ref role="16sUi3" node="3OPtF03lc_W" resolve="T" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -9349,48 +10428,28 @@
             </node>
           </node>
         </node>
-        <node concept="3cpWs8" id="3OPtF03lctn" role="3cqZAp">
-          <node concept="3cpWsn" id="3OPtF03lcto" role="3cpWs9">
-            <property role="TrG5h" value="path" />
-            <node concept="3uibUv" id="3OPtF03lctp" role="1tU5fm">
-              <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-            </node>
-            <node concept="2YIFZM" id="3OPtF03lctq" role="33vP2m">
-              <ref role="37wK5l" node="1R$Cm9qEBDL" resolve="create" />
-              <ref role="1Pybhc" node="1R$Cm9qEqLU" resolve="Path" />
-              <node concept="2OqwBi" id="3OPtF03lctr" role="37wK5m">
-                <node concept="1rXfSq" id="3OPtF03lcts" role="2Oq$k0">
-                  <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
-                </node>
-                <node concept="liA8E" id="3OPtF03lctt" role="2OqNvi">
-                  <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                </node>
-              </node>
-            </node>
+        <node concept="3SKdUt" id="1OShD0HMzA0" role="3cqZAp">
+          <node concept="3SKdUq" id="1OShD0HMzA1" role="3SKWNk">
+            <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
           </node>
         </node>
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-          <node concept="1rXfSq" id="3OPtF03lctv" role="3clFbG">
-            <ref role="37wK5l" node="3OPtF03lcqe" resolve="prependPath" />
-            <node concept="37vLTw" id="3OPtF03lctw" role="37wK5m">
-              <ref role="3cqZAo" node="3OPtF03lctb" resolve="map" />
-            </node>
-            <node concept="37vLTw" id="3OPtF03lctx" role="37wK5m">
-              <ref role="3cqZAo" node="3OPtF03lcto" resolve="path" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="3OPtF03lcty" role="3cqZAp">
-          <node concept="2ShNRf" id="3OPtF03lctz" role="3clFbG">
-            <node concept="1pGfFk" id="3OPtF03lct$" role="2ShVmc">
-              <ref role="37wK5l" node="3OPtF03lcrB" resolve="ListBranch" />
-              <node concept="37vLTw" id="3OPtF03lct_" role="37wK5m">
-                <ref role="3cqZAo" node="3OPtF03lcto" resolve="path" />
+        <node concept="3clFbF" id="1OShD0HMzA2" role="3cqZAp">
+          <node concept="10QFUN" id="1OShD0HMzA3" role="3clFbG">
+            <node concept="1rXfSq" id="1OShD0HMzA4" role="10QFUP">
+              <ref role="37wK5l" node="1OShD0HL7j9" resolve="create" />
+              <node concept="1rXfSq" id="1OShD0HMzA5" role="37wK5m">
+                <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
               </node>
-              <node concept="37vLTw" id="3OPtF03lctA" role="37wK5m">
+              <node concept="37vLTw" id="1OShD0HM_cj" role="37wK5m">
                 <ref role="3cqZAo" node="3OPtF03lctb" resolve="map" />
               </node>
             </node>
+            <node concept="3uibUv" id="1OShD0HMzA7" role="10QFUM">
+              <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="16syzq" id="1OShD0HMzA8" role="11_B2D">
+                <ref role="16sUi3" node="3OPtF03lc_W" resolve="T" />
+              </node>
+            </node>
           </node>
         </node>
       </node>
@@ -9436,13 +10495,8 @@
                 <node concept="2YIFZM" id="2q_78a92HDl" role="37wK5m">
                   <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
                   <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
-                  <node concept="2OqwBi" id="2q_78a92HDm" role="37wK5m">
-                    <node concept="1rXfSq" id="2q_78a92HDn" role="2Oq$k0">
-                      <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
-                    </node>
-                    <node concept="liA8E" id="2q_78a92HDo" role="2OqNvi">
-                      <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                    </node>
+                  <node concept="1rXfSq" id="1OShD0HF0sV" role="37wK5m">
+                    <ref role="37wK5l" node="1R$Cm9qGRoH" resolve="symbol" />
                   </node>
                 </node>
               </node>
@@ -9606,27 +10660,6 @@
       </node>
     </node>
     <node concept="2tJIrI" id="3OPtF03lcuK" role="jymVt" />
-    <node concept="3clFb_" id="3OPtF03lcuL" role="jymVt">
-      <property role="1EzhhJ" value="false" />
-      <property role="TrG5h" value="path" />
-      <property role="od$2w" value="false" />
-      <property role="DiZV1" value="false" />
-      <node concept="3Tm1VV" id="3OPtF03lcuM" role="1B3o_S" />
-      <node concept="3uibUv" id="3OPtF03lcuN" role="3clF45">
-        <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-      </node>
-      <node concept="3clFbS" id="3OPtF03lcuO" role="3clF47">
-        <node concept="3clFbF" id="3OPtF03lcuP" role="3cqZAp">
-          <node concept="3nyPlj" id="3OPtF03lcuQ" role="3clFbG">
-            <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
-          </node>
-        </node>
-      </node>
-      <node concept="2AHcQZ" id="3OPtF03lcuR" role="2AJF6D">
-        <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-      </node>
-    </node>
-    <node concept="2tJIrI" id="3OPtF03lcuS" role="jymVt" />
     <node concept="3clFb_" id="3OPtF03lcuT" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="prependPath" />
@@ -9636,7 +10669,7 @@
         <node concept="3clFbF" id="3OPtF03lcuV" role="3cqZAp">
           <node concept="2OqwBi" id="3OPtF03lcuW" role="3clFbG">
             <node concept="1rXfSq" id="3OPtF03lcuX" role="2Oq$k0">
-              <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
+              <ref role="37wK5l" node="1R$Cm9qGYlZ" resolve="path" />
             </node>
             <node concept="liA8E" id="3OPtF03lcuY" role="2OqNvi">
               <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
@@ -9657,38 +10690,6 @@
       </node>
     </node>
     <node concept="2tJIrI" id="3OPtF03lcv4" role="jymVt" />
-    <node concept="3clFb_" id="3OPtF03lcv5" role="jymVt">
-      <property role="1EzhhJ" value="false" />
-      <property role="TrG5h" value="isCons" />
-      <property role="od$2w" value="false" />
-      <property role="DiZV1" value="false" />
-      <node concept="3clFbS" id="3OPtF03lcv6" role="3clF47">
-        <node concept="3clFbF" id="3OPtF03lcv7" role="3cqZAp">
-          <node concept="3clFbT" id="3OPtF03lcv8" role="3clFbG">
-            <property role="3clFbU" value="false" />
-          </node>
-        </node>
-      </node>
-      <node concept="3Tmbuc" id="3OPtF03lcv9" role="1B3o_S" />
-      <node concept="10P_77" id="3OPtF03lcva" role="3clF45" />
-    </node>
-    <node concept="2tJIrI" id="3OPtF03lcvb" role="jymVt" />
-    <node concept="3clFb_" id="3OPtF03lcvc" role="jymVt">
-      <property role="1EzhhJ" value="false" />
-      <property role="TrG5h" value="isNil" />
-      <property role="od$2w" value="false" />
-      <property role="DiZV1" value="false" />
-      <node concept="3clFbS" id="3OPtF03lcvd" role="3clF47">
-        <node concept="3clFbF" id="3OPtF03lcve" role="3cqZAp">
-          <node concept="3clFbT" id="3OPtF03lcvf" role="3clFbG">
-            <property role="3clFbU" value="false" />
-          </node>
-        </node>
-      </node>
-      <node concept="3Tmbuc" id="3OPtF03lcvg" role="1B3o_S" />
-      <node concept="10P_77" id="3OPtF03lcvh" role="3clF45" />
-    </node>
-    <node concept="2tJIrI" id="3OPtF03lcvi" role="jymVt" />
     <node concept="3clFb_" id="3OPtF03lcvj" role="jymVt">
       <property role="TrG5h" value="appendTo" />
       <node concept="37vLTG" id="3OPtF03lcvk" role="3clF46">
@@ -9755,18 +10756,14 @@
       <property role="1sVAO0" value="false" />
       <property role="1EXbeo" value="false" />
       <property role="TrG5h" value="Cons" />
-      <node concept="2tJIrI" id="3OPtF03lcvI" role="jymVt" />
+      <node concept="2tJIrI" id="1OShD0HGX8y" role="jymVt" />
       <node concept="3clFbW" id="3OPtF03lcvJ" role="jymVt">
         <node concept="37vLTG" id="3OPtF03lcvK" role="3clF46">
           <property role="TrG5h" value="head" />
-          <node concept="3uibUv" id="3OPtF03lcvL" role="1tU5fm">
-            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
+          <node concept="16syzq" id="1OShD0I4CqW" role="1tU5fm">
+            <ref role="16sUi3" node="3OPtF03lcyE" resolve="T" />
           </node>
         </node>
-        <node concept="37vLTG" id="3OPtF03lcvM" role="3clF46">
-          <property role="TrG5h" value="headIdx" />
-          <node concept="10Oyi0" id="3OPtF03lcvN" role="1tU5fm" />
-        </node>
         <node concept="37vLTG" id="3OPtF03lcvO" role="3clF46">
           <property role="TrG5h" value="tail" />
           <node concept="3uibUv" id="3OPtF03lcvP" role="1tU5fm">
@@ -9783,16 +10780,9 @@
             <node concept="2YIFZM" id="3OPtF03lcvU" role="37wK5m">
               <ref role="37wK5l" node="1R$Cm9qEBDL" resolve="create" />
               <ref role="1Pybhc" node="1R$Cm9qEqLU" resolve="Path" />
-              <node concept="2YIFZM" id="3OPtF03lcvV" role="37wK5m">
-                <ref role="37wK5l" node="3OPtF03lc$d" resolve="wrap" />
-                <ref role="1Pybhc" node="3OPtF03lc$b" resolve="ListBranch.SymbolWrapper" />
-                <node concept="Rm8GO" id="3OPtF03lcvW" role="37wK5m">
-                  <ref role="Rm8GQ" node="3OPtF03lc$8" resolve="CONS" />
-                  <ref role="1Px2BO" node="3OPtF03lc$6" resolve="ListBranch.Symbols" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcvX" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcvM" resolve="headIdx" />
-                </node>
+              <node concept="Rm8GO" id="1OShD0HGB9i" role="37wK5m">
+                <ref role="Rm8GQ" node="3OPtF03lc$8" resolve="CONS" />
+                <ref role="1Px2BO" node="3OPtF03lc$6" resolve="ListBranch.Symbols" />
               </node>
             </node>
             <node concept="37vLTw" id="3OPtF03lcvY" role="37wK5m">
@@ -9803,30 +10793,9 @@
             </node>
           </node>
         </node>
-        <node concept="3Tm1VV" id="3OPtF03lcw0" role="1B3o_S" />
+        <node concept="3Tm6S6" id="1OShD0I7frl" role="1B3o_S" />
       </node>
       <node concept="2tJIrI" id="3OPtF03lcw1" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lcw2" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="path" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tm1VV" id="3OPtF03lcw3" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF03lcw4" role="3clF45">
-          <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-        </node>
-        <node concept="3clFbS" id="3OPtF03lcw5" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lcw6" role="3cqZAp">
-            <node concept="3nyPlj" id="3OPtF03lcw7" role="3clFbG">
-              <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lcw8" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF03lcw9" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lcwa" role="jymVt">
         <property role="1EzhhJ" value="false" />
         <property role="TrG5h" value="copyRecursively" />
@@ -9844,20 +10813,20 @@
           <node concept="3cpWs8" id="3OPtF03lcwg" role="3cqZAp">
             <node concept="3cpWsn" id="3OPtF03lcwh" role="3cpWs9">
               <property role="TrG5h" value="headCopy" />
-              <node concept="3uibUv" id="3OPtF03lcwi" role="1tU5fm">
-                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
-                <node concept="3qUE_q" id="3OPtF03lcwj" role="11_B2D">
-                  <node concept="3uibUv" id="3OPtF03lcwk" role="3qUE_r">
-                    <ref role="3uigEE" to="jfki:~Node" resolve="Node" />
-                  </node>
-                </node>
+              <node concept="16syzq" id="1OShD0HKDkO" role="1tU5fm">
+                <ref role="16sUi3" node="3OPtF03lcyE" resolve="T" />
               </node>
-              <node concept="2OqwBi" id="3OPtF03lcwl" role="33vP2m">
-                <node concept="1rXfSq" id="3OPtF03lcwm" role="2Oq$k0">
-                  <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
+              <node concept="10QFUN" id="1OShD0HKGvl" role="33vP2m">
+                <node concept="16syzq" id="1OShD0HKGvh" role="10QFUM">
+                  <ref role="16sUi3" node="3OPtF03lcyE" resolve="T" />
                 </node>
-                <node concept="liA8E" id="3OPtF03lcwn" role="2OqNvi">
-                  <ref role="37wK5l" node="1bm7a6EXvNI" resolve="copyRecursively" />
+                <node concept="2OqwBi" id="1OShD0HKGvi" role="10QFUP">
+                  <node concept="1rXfSq" id="1OShD0HKGvj" role="2Oq$k0">
+                    <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
+                  </node>
+                  <node concept="liA8E" id="1OShD0HKGvk" role="2OqNvi">
+                    <ref role="37wK5l" node="1bm7a6EXvNI" resolve="copyRecursively" />
+                  </node>
                 </node>
               </node>
             </node>
@@ -9881,45 +10850,15 @@
               </node>
             </node>
           </node>
-          <node concept="3cpWs8" id="3OPtF03lcwv" role="3cqZAp">
-            <node concept="3cpWsn" id="3OPtF03lcww" role="3cpWs9">
-              <property role="TrG5h" value="idx" />
-              <node concept="10Oyi0" id="3OPtF03lcwx" role="1tU5fm" />
-              <node concept="2OqwBi" id="3OPtF03lcwy" role="33vP2m">
-                <node concept="1eOMI4" id="3OPtF03lcwz" role="2Oq$k0">
-                  <node concept="10QFUN" id="3OPtF03lcw$" role="1eOMHV">
-                    <node concept="3uibUv" id="3OPtF03lcw_" role="10QFUM">
-                      <ref role="3uigEE" node="3OPtF03lc$b" resolve="ListBranch.SymbolWrapper" />
-                    </node>
-                    <node concept="2OqwBi" id="3OPtF03lcwA" role="10QFUP">
-                      <node concept="1rXfSq" id="3OPtF03lcwB" role="2Oq$k0">
-                        <ref role="37wK5l" node="3OPtF03lcw2" resolve="path" />
-                      </node>
-                      <node concept="liA8E" id="3OPtF03lcwC" role="2OqNvi">
-                        <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-                <node concept="2OwXpG" id="3OPtF03lcwD" role="2OqNvi">
-                  <ref role="2Oxat5" node="3OPtF03lc_S" resolve="idx" />
-                </node>
+          <node concept="3clFbF" id="1OShD0HKRKf" role="3cqZAp">
+            <node concept="2YIFZM" id="1OShD0HKRKh" role="3clFbG">
+              <ref role="37wK5l" node="1OShD0HGZnt" resolve="createCons" />
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="37vLTw" id="1OShD0HKRKi" role="37wK5m">
+                <ref role="3cqZAo" node="3OPtF03lcwh" resolve="headCopy" />
               </node>
-            </node>
-          </node>
-          <node concept="3clFbF" id="3OPtF03lcwE" role="3cqZAp">
-            <node concept="2ShNRf" id="3OPtF03lcwF" role="3clFbG">
-              <node concept="1pGfFk" id="3OPtF03lcwG" role="2ShVmc">
-                <ref role="37wK5l" node="3OPtF03lcvJ" resolve="ListBranch.Cons" />
-                <node concept="37vLTw" id="3OPtF03lcwH" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcwh" resolve="headCopy" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcwI" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcww" resolve="idx" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcwJ" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcwp" resolve="tailCopy" />
-                </node>
+              <node concept="37vLTw" id="1OShD0HKRKj" role="37wK5m">
+                <ref role="3cqZAo" node="3OPtF03lcwp" resolve="tailCopy" />
               </node>
             </node>
           </node>
@@ -9943,24 +10882,24 @@
           <node concept="3cpWs8" id="3OPtF03lcwR" role="3cqZAp">
             <node concept="3cpWsn" id="3OPtF03lcwS" role="3cpWs9">
               <property role="TrG5h" value="headMap" />
-              <node concept="2OqwBi" id="3OPtF03lcwT" role="33vP2m">
-                <node concept="37vLTw" id="3OPtF03lcwU" role="2Oq$k0">
-                  <ref role="3cqZAo" node="3OPtF03lcwM" resolve="mapper" />
+              <node concept="10QFUN" id="1OShD0HKKNm" role="33vP2m">
+                <node concept="16syzq" id="1OShD0HKKNh" role="10QFUM">
+                  <ref role="16sUi3" node="3OPtF03lcyE" resolve="T" />
                 </node>
-                <node concept="liA8E" id="3OPtF03lcwV" role="2OqNvi">
-                  <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
-                  <node concept="1rXfSq" id="3OPtF03lcwW" role="37wK5m">
-                    <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
+                <node concept="2OqwBi" id="1OShD0HKKNi" role="10QFUP">
+                  <node concept="37vLTw" id="1OShD0HKKNj" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3OPtF03lcwM" resolve="mapper" />
+                  </node>
+                  <node concept="liA8E" id="1OShD0HKKNk" role="2OqNvi">
+                    <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
+                    <node concept="1rXfSq" id="1OShD0HKKNl" role="37wK5m">
+                      <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
+                    </node>
                   </node>
                 </node>
               </node>
-              <node concept="3uibUv" id="3OPtF03lcwX" role="1tU5fm">
-                <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
-                <node concept="3qUE_q" id="3OPtF03lcwY" role="11_B2D">
-                  <node concept="3uibUv" id="3OPtF03lcwZ" role="3qUE_r">
-                    <ref role="3uigEE" to="jfki:~Node" resolve="Node" />
-                  </node>
-                </node>
+              <node concept="16syzq" id="1OShD0HKIBh" role="1tU5fm">
+                <ref role="16sUi3" node="3OPtF03lcyE" resolve="T" />
               </node>
             </node>
           </node>
@@ -9986,45 +10925,15 @@
               </node>
             </node>
           </node>
-          <node concept="3cpWs8" id="3OPtF03lcx8" role="3cqZAp">
-            <node concept="3cpWsn" id="3OPtF03lcx9" role="3cpWs9">
-              <property role="TrG5h" value="idx" />
-              <node concept="10Oyi0" id="3OPtF03lcxa" role="1tU5fm" />
-              <node concept="2OqwBi" id="3OPtF03lcxb" role="33vP2m">
-                <node concept="1eOMI4" id="3OPtF03lcxc" role="2Oq$k0">
-                  <node concept="10QFUN" id="3OPtF03lcxd" role="1eOMHV">
-                    <node concept="3uibUv" id="3OPtF03lcxe" role="10QFUM">
-                      <ref role="3uigEE" node="3OPtF03lc$b" resolve="ListBranch.SymbolWrapper" />
-                    </node>
-                    <node concept="2OqwBi" id="3OPtF03lcxf" role="10QFUP">
-                      <node concept="1rXfSq" id="3OPtF03lcxg" role="2Oq$k0">
-                        <ref role="37wK5l" node="3OPtF03lcw2" resolve="path" />
-                      </node>
-                      <node concept="liA8E" id="3OPtF03lcxh" role="2OqNvi">
-                        <ref role="37wK5l" node="1R$Cm9qH4eA" resolve="element" />
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-                    </node>
-                  </node>
-                </node>
-                <node concept="2OwXpG" id="3OPtF03lcxi" role="2OqNvi">
-                  <ref role="2Oxat5" node="3OPtF03lc_S" resolve="idx" />
-                </node>
+          <node concept="3clFbF" id="1OShD0HKNbM" role="3cqZAp">
+            <node concept="2YIFZM" id="1OShD0HKNbO" role="3clFbG">
+              <ref role="37wK5l" node="1OShD0HGZnt" resolve="createCons" />
+              <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+              <node concept="37vLTw" id="1OShD0HKNbP" role="37wK5m">
+                <ref role="3cqZAo" node="3OPtF03lcwS" resolve="headMap" />
               </node>
-            </node>
-          </node>
-          <node concept="3clFbF" id="3OPtF03lcxj" role="3cqZAp">
-            <node concept="2ShNRf" id="3OPtF03lcxk" role="3clFbG">
-              <node concept="1pGfFk" id="3OPtF03lcxl" role="2ShVmc">
-                <ref role="37wK5l" node="3OPtF03lcvJ" resolve="ListBranch.Cons" />
-                <node concept="37vLTw" id="3OPtF03lcxm" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcwS" resolve="headMap" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcxn" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcx9" resolve="idx" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lcxo" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcx1" resolve="tailMap" />
-                </node>
+              <node concept="37vLTw" id="1OShD0HKNbQ" role="37wK5m">
+                <ref role="3cqZAo" node="3OPtF03lcx1" resolve="tailMap" />
               </node>
             </node>
           </node>
@@ -10050,26 +10959,21 @@
               <node concept="2YIFZM" id="3OPtF03lcxy" role="3uHU7w">
                 <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
                 <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
-                <node concept="1rXfSq" id="3OPtF03lcxz" role="37wK5m">
-                  <ref role="37wK5l" node="6$jH9oLbK0n" resolve="childAt" />
-                  <node concept="3cmrfG" id="3OPtF03lcx$" role="37wK5m">
-                    <property role="3cmrfH" value="1" />
-                  </node>
+                <node concept="1rXfSq" id="1OShD0I6dMx" role="37wK5m">
+                  <ref role="37wK5l" node="3OPtF03lcyf" resolve="tail" />
                 </node>
               </node>
               <node concept="3cpWs3" id="3OPtF03lcx_" role="3uHU7B">
                 <node concept="2YIFZM" id="3OPtF03lcxA" role="3uHU7B">
                   <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
                   <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
-                  <node concept="1rXfSq" id="3OPtF03lcxB" role="37wK5m">
-                    <ref role="37wK5l" node="6$jH9oLbK0n" resolve="childAt" />
-                    <node concept="3cmrfG" id="3OPtF03lcxC" role="37wK5m">
-                      <property role="3cmrfH" value="0" />
-                    </node>
+                  <node concept="1rXfSq" id="1OShD0I6b2n" role="37wK5m">
+                    <ref role="37wK5l" node="3OPtF03lcy7" resolve="head" />
                   </node>
                 </node>
-                <node concept="Xl_RD" id="3OPtF03lcxD" role="3uHU7w">
-                  <property role="Xl_RC" value=":" />
+                <node concept="Rm8GO" id="1OShD0I5481" role="3uHU7w">
+                  <ref role="Rm8GQ" node="3OPtF03lc$8" resolve="CONS" />
+                  <ref role="1Px2BO" node="3OPtF03lc$6" resolve="ListBranch.Symbols" />
                 </node>
               </node>
             </node>
@@ -10079,25 +10983,6 @@
           <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
         </node>
       </node>
-      <node concept="2tJIrI" id="3OPtF03lcxF" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lcxG" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="isCons" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tmbuc" id="3OPtF03lcxH" role="1B3o_S" />
-        <node concept="10P_77" id="3OPtF03lcxI" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lcxJ" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lcxK" role="3cqZAp">
-            <node concept="3clFbT" id="3OPtF03lcxL" role="3clFbG">
-              <property role="3clFbU" value="true" />
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lcxM" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
       <node concept="2tJIrI" id="3OPtF03lcxN" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lcxO" role="jymVt">
         <property role="TrG5h" value="appendTo" />
@@ -10199,38 +11084,6 @@
         </node>
       </node>
       <node concept="2tJIrI" id="3OPtF03lcyq" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lcyr" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="prependPath" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tmbuc" id="3OPtF03lcys" role="1B3o_S" />
-        <node concept="3cqZAl" id="3OPtF03lcyt" role="3clF45" />
-        <node concept="37vLTG" id="3OPtF03lcyu" role="3clF46">
-          <property role="TrG5h" value="parentPath" />
-          <node concept="3uibUv" id="3OPtF03lcyv" role="1tU5fm">
-            <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-          </node>
-        </node>
-        <node concept="3clFbS" id="3OPtF03lcyw" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lcyx" role="3cqZAp">
-            <node concept="2OqwBi" id="3OPtF03lcyy" role="3clFbG">
-              <node concept="1rXfSq" id="3OPtF03lcyz" role="2Oq$k0">
-                <ref role="37wK5l" node="3OPtF03lcw2" resolve="path" />
-              </node>
-              <node concept="liA8E" id="3OPtF03lcy$" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                <node concept="37vLTw" id="3OPtF03lcy_" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lcyu" resolve="parentPath" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lcyA" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
       <node concept="3Tm1VV" id="3OPtF03lcyB" role="1B3o_S" />
       <node concept="3uibUv" id="3OPtF03lcyC" role="1zkMxy">
         <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
@@ -10272,30 +11125,9 @@
             </node>
           </node>
         </node>
-        <node concept="3Tm1VV" id="3OPtF03lcyR" role="1B3o_S" />
+        <node concept="3Tm6S6" id="1OShD0I7hJk" role="1B3o_S" />
       </node>
       <node concept="2tJIrI" id="3OPtF03lcyS" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lcyT" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="path" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tm1VV" id="3OPtF03lcyU" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF03lcyV" role="3clF45">
-          <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-        </node>
-        <node concept="3clFbS" id="3OPtF03lcyW" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lcyX" role="3cqZAp">
-            <node concept="3nyPlj" id="3OPtF03lcyY" role="3clFbG">
-              <ref role="37wK5l" node="3OPtF03lcuL" resolve="path" />
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lcyZ" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF03lcz0" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lcz1" role="jymVt">
         <property role="1EzhhJ" value="false" />
         <property role="TrG5h" value="copyRecursively" />
@@ -10374,59 +11206,7 @@
           <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
         </node>
       </node>
-      <node concept="2tJIrI" id="3OPtF03lczw" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lczx" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="isNil" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tmbuc" id="3OPtF03lczy" role="1B3o_S" />
-        <node concept="10P_77" id="3OPtF03lczz" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lcz$" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lcz_" role="3cqZAp">
-            <node concept="3clFbT" id="3OPtF03lczA" role="3clFbG">
-              <property role="3clFbU" value="true" />
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lczB" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
       <node concept="2tJIrI" id="3OPtF03lczC" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lczD" role="jymVt">
-        <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="prependPath" />
-        <property role="od$2w" value="false" />
-        <property role="DiZV1" value="false" />
-        <node concept="3Tmbuc" id="3OPtF03lczE" role="1B3o_S" />
-        <node concept="3cqZAl" id="3OPtF03lczF" role="3clF45" />
-        <node concept="37vLTG" id="3OPtF03lczG" role="3clF46">
-          <property role="TrG5h" value="parentPath" />
-          <node concept="3uibUv" id="3OPtF03lczH" role="1tU5fm">
-            <ref role="3uigEE" node="1R$Cm9qEqLU" resolve="Path" />
-          </node>
-        </node>
-        <node concept="3clFbS" id="3OPtF03lczI" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lczJ" role="3cqZAp">
-            <node concept="2OqwBi" id="3OPtF03lczK" role="3clFbG">
-              <node concept="1rXfSq" id="3OPtF03lczL" role="2Oq$k0">
-                <ref role="37wK5l" node="3OPtF03lcyT" resolve="path" />
-              </node>
-              <node concept="liA8E" id="3OPtF03lczM" role="2OqNvi">
-                <ref role="37wK5l" node="1R$Cm9qEroc" resolve="prepend" />
-                <node concept="37vLTw" id="3OPtF03lczN" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lczG" resolve="parentPath" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="2AHcQZ" id="3OPtF03lczO" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF03lczP" role="jymVt" />
       <node concept="3clFb_" id="3OPtF03lczQ" role="jymVt">
         <property role="TrG5h" value="appendTo" />
         <property role="1EzhhJ" value="false" />
@@ -10467,284 +11247,404 @@
         </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="3OPtF03lc$5" role="jymVt" />
-    <node concept="Qs71p" id="3OPtF03lc$6" role="jymVt">
-      <property role="2bfB8j" value="true" />
-      <property role="TrG5h" value="Symbols" />
-      <node concept="QsSxf" id="3OPtF03lc$7" role="Qtgdg">
-        <property role="TrG5h" value="NIL" />
-        <ref role="37wK5l" to="e2lb:~Object.&lt;init&gt;()" resolve="Object" />
-      </node>
-      <node concept="QsSxf" id="3OPtF03lc$8" role="Qtgdg">
-        <property role="TrG5h" value="CONS" />
-        <ref role="37wK5l" to="e2lb:~Object.&lt;init&gt;()" resolve="Object" />
-      </node>
-      <node concept="3Tm1VV" id="3OPtF03lc$9" role="1B3o_S" />
-    </node>
-    <node concept="2tJIrI" id="3OPtF03lc$a" role="jymVt" />
-    <node concept="312cEu" id="3OPtF03lc$b" role="jymVt">
+    <node concept="2tJIrI" id="1OShD0I256B" role="jymVt" />
+    <node concept="312cEu" id="1OShD0I20qU" role="jymVt">
       <property role="2bfB8j" value="false" />
       <property role="1sVAO0" value="false" />
       <property role="1EXbeo" value="false" />
-      <property role="TrG5h" value="SymbolWrapper" />
-      <node concept="2tJIrI" id="3OPtF03lc$c" role="jymVt" />
-      <node concept="2YIFZL" id="3OPtF03lc$d" role="jymVt">
-        <property role="TrG5h" value="wrap" />
-        <property role="od$2w" value="false" />
+      <property role="TrG5h" value="Alias" />
+      <node concept="2tJIrI" id="1OShD0I20qV" role="jymVt" />
+      <node concept="3clFbW" id="1OShD0I20qW" role="jymVt">
+        <node concept="37vLTG" id="1OShD0I2eRA" role="3clF46">
+          <property role="TrG5h" value="var" />
+          <node concept="16syzq" id="1OShD0I8HUO" role="1tU5fm">
+            <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+          </node>
+        </node>
+        <node concept="3cqZAl" id="1OShD0I20qX" role="3clF45" />
+        <node concept="3clFbS" id="1OShD0I20qY" role="3clF47">
+          <node concept="XkiVB" id="1OShD0I20qZ" role="3cqZAp">
+            <ref role="37wK5l" node="1OShD0I2Mcp" resolve="ListBranch" />
+            <node concept="2YIFZM" id="1OShD0I20r0" role="37wK5m">
+              <ref role="37wK5l" node="1R$Cm9qEBDL" resolve="create" />
+              <ref role="1Pybhc" node="1R$Cm9qEqLU" resolve="Path" />
+              <node concept="Rm8GO" id="1OShD0I2j4m" role="37wK5m">
+                <ref role="Rm8GQ" node="1OShD0I1R$K" resolve="ALIAS" />
+                <ref role="1Px2BO" node="3OPtF03lc$6" resolve="ListBranch.Symbols" />
+              </node>
+            </node>
+            <node concept="37vLTw" id="1OShD0I2mpa" role="37wK5m">
+              <ref role="3cqZAo" node="1OShD0I2eRA" resolve="var" />
+            </node>
+          </node>
+        </node>
+        <node concept="3Tm6S6" id="1OShD0I7jdD" role="1B3o_S" />
+      </node>
+      <node concept="2tJIrI" id="1OShD0I3aG9" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I2ZmZ" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="copyRecursively" />
+        <node concept="3uibUv" id="1OShD0I2Zn0" role="3clF45">
+          <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+          <node concept="16syzq" id="1OShD0I2Zn1" role="11_B2D">
+            <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="1OShD0I2Zn2" role="1B3o_S" />
+        <node concept="2AHcQZ" id="1OShD0I2Zn3" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="1OShD0I2Zn4" role="3clF47">
+          <node concept="3cpWs8" id="1OShD0I2Zn5" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I2Zn6" role="3cpWs9">
+              <property role="TrG5h" value="varCopy" />
+              <node concept="16syzq" id="1OShD0I2Zn7" role="1tU5fm">
+                <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+              </node>
+              <node concept="10QFUN" id="1OShD0I2Zn8" role="33vP2m">
+                <node concept="16syzq" id="1OShD0I2Zn9" role="10QFUM">
+                  <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+                </node>
+                <node concept="2OqwBi" id="1OShD0I2Zna" role="10QFUP">
+                  <node concept="1rXfSq" id="1OShD0I2Znb" role="2Oq$k0">
+                    <ref role="37wK5l" node="1OShD0I2Zoq" resolve="var" />
+                  </node>
+                  <node concept="liA8E" id="1OShD0I2Znc" role="2OqNvi">
+                    <ref role="37wK5l" node="1bm7a6F1l_X" resolve="copyRecursively" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3SKdUt" id="1OShD0I7YT2" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0I7YT3" role="3SKWNk">
+              <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+            </node>
+          </node>
+          <node concept="3clFbF" id="1OShD0I7YSW" role="3cqZAp">
+            <node concept="10QFUN" id="1OShD0I7YSX" role="3clFbG">
+              <node concept="2YIFZM" id="1OShD0I7YSY" role="10QFUP">
+                <ref role="37wK5l" node="1OShD0I3vRu" resolve="createAlias" />
+                <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                <node concept="37vLTw" id="1OShD0I7YSZ" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I2Zn6" resolve="varCopy" />
+                </node>
+              </node>
+              <node concept="3uibUv" id="1OShD0I7YT0" role="10QFUM">
+                <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+                <node concept="16syzq" id="1OShD0I7YT1" role="11_B2D">
+                  <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0I2Zno" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I2Znp" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="mapRecursively" />
+        <node concept="37vLTG" id="1OShD0I2Znq" role="3clF46">
+          <property role="TrG5h" value="mapper" />
+          <node concept="3uibUv" id="1OShD0I2Znr" role="1tU5fm">
+            <ref role="3uigEE" node="3OPtF02TdNT" resolve="ITreePart.Mapper" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="1OShD0I2Zns" role="1B3o_S" />
+        <node concept="2AHcQZ" id="1OShD0I2Znt" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="1OShD0I2Znu" role="3clF47">
+          <node concept="3cpWs8" id="1OShD0I2Znv" role="3cqZAp">
+            <node concept="3cpWsn" id="1OShD0I2Znw" role="3cpWs9">
+              <property role="TrG5h" value="varMap" />
+              <node concept="10QFUN" id="1OShD0I2Znx" role="33vP2m">
+                <node concept="16syzq" id="1OShD0I2Zny" role="10QFUM">
+                  <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+                </node>
+                <node concept="2OqwBi" id="1OShD0I2Znz" role="10QFUP">
+                  <node concept="37vLTw" id="1OShD0I2Zn$" role="2Oq$k0">
+                    <ref role="3cqZAo" node="1OShD0I2Znq" resolve="mapper" />
+                  </node>
+                  <node concept="liA8E" id="1OShD0I2Zn_" role="2OqNvi">
+                    <ref role="37wK5l" node="3OPtF02TgQt" resolve="map" />
+                    <node concept="1rXfSq" id="1OShD0I2ZnA" role="37wK5m">
+                      <ref role="37wK5l" node="1OShD0I2Zoq" resolve="var" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="16syzq" id="1OShD0I2ZnB" role="1tU5fm">
+                <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+              </node>
+            </node>
+          </node>
+          <node concept="3SKdUt" id="1OShD0I7GJu" role="3cqZAp">
+            <node concept="3SKdUq" id="1OShD0I7GPE" role="3SKWNk">
+              <property role="3SKdUp" value="TODO: avoid unnecessary cast" />
+            </node>
+          </node>
+          <node concept="3clFbF" id="1OShD0I2Znk" role="3cqZAp">
+            <node concept="10QFUN" id="1OShD0I7__x" role="3clFbG">
+              <node concept="2YIFZM" id="1OShD0I7__u" role="10QFUP">
+                <ref role="37wK5l" node="1OShD0I3vRu" resolve="createAlias" />
+                <ref role="1Pybhc" node="3OPtF03lco4" resolve="ListBranch" />
+                <node concept="37vLTw" id="1OShD0I80LN" role="37wK5m">
+                  <ref role="3cqZAo" node="1OShD0I2Znw" resolve="varMap" />
+                </node>
+              </node>
+              <node concept="3uibUv" id="1OShD0I7B77" role="10QFUM">
+                <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+                <node concept="16syzq" id="1OShD0I7B78" role="11_B2D">
+                  <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3uibUv" id="1OShD0I7M7Z" role="3clF45">
+          <ref role="3uigEE" node="1OShD0I20qU" resolve="ListBranch.Alias" />
+          <node concept="16syzq" id="1OShD0I7OsH" role="11_B2D">
+            <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0I2ZnQ" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0Id3Lh" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="isVar" />
         <property role="DiZV1" value="false" />
-        <node concept="37vLTG" id="3OPtF03lc$e" role="3clF46">
-          <property role="TrG5h" value="symbol" />
-          <node concept="3uibUv" id="3OPtF03lc$f" role="1tU5fm">
-            <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
-          </node>
+        <property role="od$2w" value="false" />
+        <node concept="3Tm1VV" id="1OShD0Id3Li" role="1B3o_S" />
+        <node concept="10P_77" id="1OShD0Id3Lj" role="3clF45" />
+        <node concept="2AHcQZ" id="1OShD0Id3Ln" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
         </node>
-        <node concept="37vLTG" id="3OPtF03lc$g" role="3clF46">
-          <property role="TrG5h" value="idx" />
-          <node concept="10Oyi0" id="3OPtF03lc$h" role="1tU5fm" />
-        </node>
-        <node concept="3clFbS" id="3OPtF03lc$i" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lc$j" role="3cqZAp">
-            <node concept="2ShNRf" id="3OPtF03lc$k" role="3clFbG">
-              <node concept="1pGfFk" id="3OPtF03lc$l" role="2ShVmc">
-                <ref role="37wK5l" node="3OPtF03lc$r" resolve="ListBranch.SymbolWrapper" />
-                <node concept="37vLTw" id="3OPtF03lc$m" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lc$e" resolve="symbol" />
-                </node>
-                <node concept="37vLTw" id="3OPtF03lc$n" role="37wK5m">
-                  <ref role="3cqZAo" node="3OPtF03lc$g" resolve="idx" />
-                </node>
-              </node>
-            </node>
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-        <node concept="3Tm1VV" id="3OPtF03lc$o" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF03lc$p" role="3clF45">
-          <ref role="3uigEE" node="3OPtF03lc$b" resolve="ListBranch.SymbolWrapper" />
-        </node>
-      </node>
-      <node concept="2tJIrI" id="3OPtF03lc$q" role="jymVt" />
-      <node concept="3clFbW" id="3OPtF03lc$r" role="jymVt">
-        <node concept="3cqZAl" id="3OPtF03lc$s" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lc$t" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lc$u" role="3cqZAp">
-            <node concept="37vLTI" id="3OPtF03lc$v" role="3clFbG">
-              <node concept="2OqwBi" id="3OPtF03lc$w" role="37vLTJ">
-                <node concept="Xjq3P" id="3OPtF03lc$x" role="2Oq$k0" />
-                <node concept="2OwXpG" id="3OPtF03lc$y" role="2OqNvi">
-                  <ref role="2Oxat5" node="3OPtF03lc_P" resolve="symbol" />
-                </node>
-              </node>
-              <node concept="37vLTw" id="3OPtF03lc$z" role="37vLTx">
-                <ref role="3cqZAo" node="3OPtF03lc$F" resolve="symbol" />
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-            </node>
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-          <node concept="3clFbF" id="3OPtF03lc$$" role="3cqZAp">
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-                <node concept="Xjq3P" id="3OPtF03lc$B" role="2Oq$k0" />
-                <node concept="2OwXpG" id="3OPtF03lc$C" role="2OqNvi">
-                  <ref role="2Oxat5" node="3OPtF03lc_S" resolve="idx" />
-                </node>
-              </node>
-              <node concept="37vLTw" id="3OPtF03lc$D" role="37vLTx">
-                <ref role="3cqZAo" node="3OPtF03lc$H" resolve="idx" />
-              </node>
-            </node>
-          </node>
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-        <node concept="3Tm1VV" id="3OPtF03lc$E" role="1B3o_S" />
-        <node concept="37vLTG" id="3OPtF03lc$F" role="3clF46">
-          <property role="TrG5h" value="symbol" />
-          <node concept="3uibUv" id="3OPtF03lc$G" role="1tU5fm">
-            <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
-          </node>
-        </node>
-        <node concept="37vLTG" id="3OPtF03lc$H" role="3clF46">
-          <property role="TrG5h" value="idx" />
-          <node concept="10Oyi0" id="3OPtF03lc$I" role="1tU5fm" />
-        </node>
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-      <node concept="3clFb_" id="3OPtF03lc$K" role="jymVt">
-        <property role="TrG5h" value="idx" />
-        <node concept="10Oyi0" id="3OPtF03lc$L" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lc$M" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lc$N" role="3cqZAp">
-            <node concept="37vLTw" id="3OPtF03lc$O" role="3clFbG">
-              <ref role="3cqZAo" node="3OPtF03lc_S" resolve="idx" />
+        <node concept="3clFbS" id="1OShD0Id3Lr" role="3clF47">
+          <node concept="3clFbF" id="1OShD0Idi_a" role="3cqZAp">
+            <node concept="3clFbT" id="1OShD0Idi_9" role="3clFbG">
+              <property role="3clFbU" value="true" />
             </node>
           </node>
         </node>
       </node>
-      <node concept="2tJIrI" id="3OPtF03lc$P" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lc$Q" role="jymVt">
+      <node concept="2tJIrI" id="1OShD0Id9la" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0IeKCa" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="isTerm" />
+        <property role="DiZV1" value="false" />
+        <property role="od$2w" value="false" />
+        <node concept="3Tm1VV" id="1OShD0IeKCb" role="1B3o_S" />
+        <node concept="10P_77" id="1OShD0IeKCc" role="3clF45" />
+        <node concept="2AHcQZ" id="1OShD0IeKCg" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="1OShD0IeKCk" role="3clF47">
+          <node concept="3clFbF" id="1OShD0IeR8h" role="3cqZAp">
+            <node concept="3clFbT" id="1OShD0IeR8g" role="3clFbG">
+              <property role="3clFbU" value="false" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0IeNPk" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0IdbV1" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="asVar" />
+        <property role="DiZV1" value="false" />
+        <property role="od$2w" value="false" />
+        <node concept="3Tm1VV" id="1OShD0IdbV2" role="1B3o_S" />
+        <node concept="3uibUv" id="1OShD0IdbV3" role="3clF45">
+          <ref role="3uigEE" to="jfki:~Var" resolve="Var" />
+        </node>
+        <node concept="2AHcQZ" id="1OShD0IdbV8" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        </node>
+        <node concept="3clFbS" id="1OShD0IdbVc" role="3clF47">
+          <node concept="3clFbF" id="1OShD0IdiEH" role="3cqZAp">
+            <node concept="1rXfSq" id="1OShD0IdiEG" role="3clFbG">
+              <ref role="37wK5l" node="1OShD0I2Zoq" resolve="var" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0Id9mL" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I2ZnR" role="jymVt">
         <property role="1EzhhJ" value="false" />
         <property role="TrG5h" value="toString" />
         <property role="DiZV1" value="false" />
         <property role="IEkAT" value="false" />
-        <node concept="3Tm1VV" id="3OPtF03lc$R" role="1B3o_S" />
-        <node concept="17QB3L" id="3OPtF03lc$S" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lc$T" role="3clF47">
-          <node concept="3clFbF" id="3OPtF03lc$U" role="3cqZAp">
-            <node concept="3cpWs3" id="3OPtF03lc$V" role="3clFbG">
-              <node concept="37vLTw" id="3OPtF03lc$W" role="3uHU7w">
-                <ref role="3cqZAo" node="3OPtF03lc_S" resolve="idx" />
+        <node concept="3Tm1VV" id="1OShD0I2ZnS" role="1B3o_S" />
+        <node concept="17QB3L" id="1OShD0I2ZnT" role="3clF45" />
+        <node concept="3clFbS" id="1OShD0I2ZnU" role="3clF47">
+          <node concept="3clFbF" id="1OShD0I2ZnV" role="3cqZAp">
+            <node concept="3cpWs3" id="1OShD0I61XL" role="3clFbG">
+              <node concept="Rm8GO" id="1OShD0I64yC" role="3uHU7B">
+                <ref role="Rm8GQ" node="1OShD0I1R$K" resolve="ALIAS" />
+                <ref role="1Px2BO" node="3OPtF03lc$6" resolve="ListBranch.Symbols" />
               </node>
-              <node concept="3cpWs3" id="3OPtF03lc$X" role="3uHU7B">
-                <node concept="2YIFZM" id="3OPtF03lc$Y" role="3uHU7B">
-                  <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
-                  <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
-                  <node concept="37vLTw" id="3OPtF03lc$Z" role="37wK5m">
-                    <ref role="3cqZAo" node="3OPtF03lc_P" resolve="symbol" />
-                  </node>
-                </node>
-                <node concept="Xl_RD" id="3OPtF03lc_0" role="3uHU7w">
-                  <property role="Xl_RC" value="#" />
+              <node concept="2YIFZM" id="1OShD0I2Zo1" role="3uHU7w">
+                <ref role="37wK5l" to="e2lb:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
+                <ref role="1Pybhc" to="e2lb:~String" resolve="String" />
+                <node concept="1rXfSq" id="1OShD0IcIdV" role="37wK5m">
+                  <ref role="37wK5l" node="1OShD0I2Zoq" resolve="var" />
                 </node>
               </node>
             </node>
           </node>
         </node>
-        <node concept="2AHcQZ" id="3OPtF03lc_1" role="2AJF6D">
+        <node concept="2AHcQZ" id="1OShD0I2Zo5" role="2AJF6D">
           <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
         </node>
       </node>
-      <node concept="2tJIrI" id="3OPtF03lc_2" role="jymVt" />
-      <node concept="3clFb_" id="3OPtF03lc_3" role="jymVt">
+      <node concept="2tJIrI" id="1OShD0I2Zo6" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I2Zo7" role="jymVt">
+        <property role="TrG5h" value="appendTo" />
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="hashCode" />
-        <property role="DiZV1" value="false" />
-        <property role="IEkAT" value="false" />
-        <node concept="3Tm1VV" id="3OPtF03lc_4" role="1B3o_S" />
-        <node concept="10Oyi0" id="3OPtF03lc_5" role="3clF45" />
-        <node concept="3clFbS" id="3OPtF03lc_6" role="3clF47">
-          <node concept="3cpWs6" id="3OPtF03lc_7" role="3cqZAp">
-            <node concept="3cpWs3" id="3OPtF03lc_8" role="3cqZAk">
-              <node concept="17qRlL" id="3OPtF03lc_9" role="3uHU7w">
-                <node concept="2OqwBi" id="3OPtF03lc_a" role="3uHU7w">
-                  <node concept="37vLTw" id="3OPtF03lc_b" role="2Oq$k0">
-                    <ref role="3cqZAo" node="3OPtF03lc_P" resolve="symbol" />
-                  </node>
-                  <node concept="liA8E" id="3OPtF03lc_c" role="2OqNvi">
-                    <ref role="37wK5l" to="e2lb:~Object.hashCode():int" resolve="hashCode" />
-                  </node>
-                </node>
-                <node concept="3cmrfG" id="3OPtF03lc_d" role="3uHU7B">
-                  <property role="3cmrfH" value="23" />
-                </node>
+        <node concept="37vLTG" id="1OShD0I2Zo8" role="3clF46">
+          <property role="TrG5h" value="list" />
+          <node concept="3uibUv" id="1OShD0I2Zo9" role="1tU5fm">
+            <ref role="3uigEE" to="k7g3:~List" resolve="List" />
+            <node concept="16syzq" id="1OShD0I2Zoa" role="11_B2D">
+              <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cqZAl" id="1OShD0I2Zob" role="3clF45" />
+        <node concept="3Tmbuc" id="1OShD0I2Zoc" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0I2Zod" role="3clF47">
+          <node concept="3clFbF" id="1OShD0I2Zoe" role="3cqZAp">
+            <node concept="2OqwBi" id="1OShD0I2Zof" role="3clFbG">
+              <node concept="37vLTw" id="1OShD0I2Zog" role="2Oq$k0">
+                <ref role="3cqZAo" node="1OShD0I2Zo8" resolve="list" />
               </node>
-              <node concept="3cmrfG" id="3OPtF03lc_e" role="3uHU7B">
-                <property role="3cmrfH" value="47" />
+              <node concept="liA8E" id="1OShD0I2Zoh" role="2OqNvi">
+                <ref role="37wK5l" to="k7g3:~List.add(java.lang.Object):boolean" resolve="add" />
+                <node concept="1rXfSq" id="1OShD0I2Zoi" role="37wK5m">
+                  <ref role="37wK5l" node="1OShD0I2Zoq" resolve="var" />
+                </node>
               </node>
             </node>
           </node>
         </node>
-        <node concept="2AHcQZ" id="3OPtF03lc_f" role="2AJF6D">
+        <node concept="2AHcQZ" id="1OShD0I2Zoo" role="2AJF6D">
           <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
         </node>
       </node>
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-      <node concept="3clFb_" id="3OPtF03lc_h" role="jymVt">
+      <node concept="2tJIrI" id="1OShD0I2Zop" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I2Zoq" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="equals" />
+        <property role="TrG5h" value="var" />
+        <property role="od$2w" value="false" />
         <property role="DiZV1" value="false" />
-        <property role="IEkAT" value="false" />
-        <node concept="3Tm1VV" id="3OPtF03lc_i" role="1B3o_S" />
-        <node concept="10P_77" id="3OPtF03lc_j" role="3clF45" />
-        <node concept="37vLTG" id="3OPtF03lc_k" role="3clF46">
-          <property role="TrG5h" value="object" />
-          <node concept="3uibUv" id="3OPtF03lc_l" role="1tU5fm">
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-        <node concept="3clFbS" id="3OPtF03lc_m" role="3clF47">
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-              <node concept="3cpWs6" id="3OPtF03lc_p" role="3cqZAp">
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-                <node concept="37vLTw" id="3OPtF03lc_u" role="2ZW6bz">
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-                      </node>
-                      <node concept="37vLTw" id="3OPtF03lc_A" role="10QFUP">
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-                      </node>
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-                  <node concept="2OwXpG" id="3OPtF03lc_B" role="2OqNvi">
-                    <ref role="2Oxat5" node="3OPtF03lc_S" resolve="idx" />
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-                  <ref role="3cqZAo" node="3OPtF03lc_S" resolve="idx" />
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-                <node concept="37vLTw" id="3OPtF03lc_E" role="2Oq$k0">
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-                </node>
-                <node concept="liA8E" id="3OPtF03lc_F" role="2OqNvi">
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-                  <node concept="2OqwBi" id="3OPtF03lc_G" role="37wK5m">
-                    <node concept="1eOMI4" id="3OPtF03lc_H" role="2Oq$k0">
-                      <node concept="10QFUN" id="3OPtF03lc_I" role="1eOMHV">
-                        <node concept="3uibUv" id="3OPtF03lc_J" role="10QFUM">
-                          <ref role="3uigEE" node="3OPtF03lc$b" resolve="ListBranch.SymbolWrapper" />
-                        </node>
-                        <node concept="37vLTw" id="3OPtF03lc_K" role="10QFUP">
-                          <ref role="3cqZAo" node="3OPtF03lc_k" resolve="object" />
-                        </node>
-                      </node>
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-                    <node concept="2OwXpG" id="3OPtF03lc_L" role="2OqNvi">
-                      <ref role="2Oxat5" node="3OPtF03lc_P" resolve="symbol" />
-                    </node>
-                  </node>
-                </node>
+        <node concept="3clFbS" id="1OShD0I2Zor" role="3clF47">
+          <node concept="3clFbF" id="1OShD0I2Zos" role="3cqZAp">
+            <node concept="1rXfSq" id="1OShD0I2Zot" role="3clFbG">
+              <ref role="37wK5l" node="6$jH9oLbK0n" resolve="childAt" />
+              <node concept="3cmrfG" id="1OShD0I2Zou" role="37wK5m">
+                <property role="3cmrfH" value="0" />
               </node>
             </node>
           </node>
         </node>
-        <node concept="2AHcQZ" id="3OPtF03lc_M" role="2AJF6D">
-          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        <node concept="3Tm6S6" id="1OShD0I2Zov" role="1B3o_S" />
+        <node concept="16syzq" id="1OShD0I2Zow" role="3clF45">
+          <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
         </node>
       </node>
-      <node concept="2tJIrI" id="3OPtF03lc_N" role="jymVt" />
-      <node concept="3Tm6S6" id="3OPtF03lc_O" role="1B3o_S" />
-      <node concept="312cEg" id="3OPtF03lc_P" role="jymVt">
-        <property role="TrG5h" value="symbol" />
-        <node concept="3Tm6S6" id="3OPtF03lc_Q" role="1B3o_S" />
-        <node concept="3uibUv" id="3OPtF03lc_R" role="1tU5fm">
-          <ref role="3uigEE" to="e2lb:~Object" resolve="Object" />
+      <node concept="3Tm1VV" id="1OShD0I20rI" role="1B3o_S" />
+      <node concept="16euLQ" id="1OShD0I20rJ" role="16eVyc">
+        <property role="TrG5h" value="T" />
+        <node concept="3uibUv" id="1OShD0I20rK" role="3ztrMU">
+          <ref role="3uigEE" node="uNmovXiEd4" resolve="Variable" />
         </node>
       </node>
-      <node concept="312cEg" id="3OPtF03lc_S" role="jymVt">
-        <property role="TrG5h" value="idx" />
-        <node concept="3Tm6S6" id="3OPtF03lc_T" role="1B3o_S" />
-        <node concept="10Oyi0" id="3OPtF03lc_U" role="1tU5fm" />
+      <node concept="3uibUv" id="1OShD0I20rM" role="1zkMxy">
+        <ref role="3uigEE" node="3OPtF03lco4" resolve="ListBranch" />
+        <node concept="16syzq" id="1OShD0I20rN" role="11_B2D">
+          <ref role="16sUi3" node="1OShD0I20rJ" resolve="T" />
+        </node>
       </node>
     </node>
+    <node concept="2tJIrI" id="3OPtF03lc$5" role="jymVt" />
+    <node concept="Qs71p" id="3OPtF03lc$6" role="jymVt">
+      <property role="2bfB8j" value="true" />
+      <property role="TrG5h" value="Symbols" />
+      <node concept="2tJIrI" id="1OShD0I1TMs" role="jymVt" />
+      <node concept="3clFbW" id="1OShD0I1UxM" role="jymVt">
+        <node concept="3cqZAl" id="1OShD0I1UxO" role="3clF45" />
+        <node concept="3Tm1VV" id="1OShD0I1UxP" role="1B3o_S" />
+        <node concept="3clFbS" id="1OShD0I1UxQ" role="3clF47">
+          <node concept="3clFbF" id="1OShD0I1VSp" role="3cqZAp">
+            <node concept="37vLTI" id="1OShD0I1VSr" role="3clFbG">
+              <node concept="2OqwBi" id="1OShD0I1VSv" role="37vLTJ">
+                <node concept="Xjq3P" id="1OShD0I1VSy" role="2Oq$k0" />
+                <node concept="2OwXpG" id="1OShD0I1VSu" role="2OqNvi">
+                  <ref role="2Oxat5" node="1OShD0I1VSl" resolve="sym" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="1OShD0I1VSz" role="37vLTx">
+                <ref role="3cqZAo" node="1OShD0I1VG1" resolve="sym" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="37vLTG" id="1OShD0I1VG1" role="3clF46">
+          <property role="TrG5h" value="sym" />
+          <node concept="17QB3L" id="1OShD0I1VG0" role="1tU5fm" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0I1WAw" role="jymVt" />
+      <node concept="3clFb_" id="1OShD0I1Xky" role="jymVt">
+        <property role="1EzhhJ" value="false" />
+        <property role="TrG5h" value="toString" />
+        <property role="DiZV1" value="false" />
+        <property role="IEkAT" value="false" />
+        <node concept="3Tm1VV" id="1OShD0I1Xkz" role="1B3o_S" />
+        <node concept="3uibUv" id="1OShD0I1Xk_" role="3clF45">
+          <ref role="3uigEE" to="e2lb:~String" resolve="String" />
+        </node>
+        <node concept="3clFbS" id="1OShD0I1XkA" role="3clF47">
+          <node concept="3clFbF" id="1OShD0I20eg" role="3cqZAp">
+            <node concept="37vLTw" id="1OShD0I20ef" role="3clFbG">
+              <ref role="3cqZAo" node="1OShD0I1VSl" resolve="sym" />
+            </node>
+          </node>
+        </node>
+        <node concept="2AHcQZ" id="1OShD0I1XkB" role="2AJF6D">
+          <ref role="2AI5Lk" to="e2lb:~Override" resolve="Override" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="1OShD0I1Zul" role="jymVt" />
+      <node concept="QsSxf" id="3OPtF03lc$7" role="Qtgdg">
+        <property role="TrG5h" value="NIL" />
+        <ref role="37wK5l" node="1OShD0I1UxM" resolve="ListBranch.Symbols" />
+        <node concept="Xl_RD" id="1OShD0I20hE" role="37wK5m">
+          <property role="Xl_RC" value="NIL" />
+        </node>
+      </node>
+      <node concept="QsSxf" id="3OPtF03lc$8" role="Qtgdg">
+        <property role="TrG5h" value="CONS" />
+        <ref role="37wK5l" node="1OShD0I1UxM" resolve="ListBranch.Symbols" />
+        <node concept="Xl_RD" id="1OShD0I20lu" role="37wK5m">
+          <property role="Xl_RC" value=":" />
+        </node>
+      </node>
+      <node concept="QsSxf" id="1OShD0I1R$K" role="Qtgdg">
+        <property role="TrG5h" value="ALIAS" />
+        <ref role="37wK5l" node="1OShD0I1UxM" resolve="ListBranch.Symbols" />
+        <node concept="Xl_RD" id="1OShD0I20pU" role="37wK5m">
+          <property role="Xl_RC" value="&amp;" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="3OPtF03lc$9" role="1B3o_S" />
+      <node concept="312cEg" id="1OShD0I1VSl" role="jymVt">
+        <property role="TrG5h" value="sym" />
+        <node concept="3Tm6S6" id="1OShD0I1VSm" role="1B3o_S" />
+        <node concept="17QB3L" id="1OShD0I1VSo" role="1tU5fm" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="3OPtF03lc$a" role="jymVt" />
     <node concept="3Tm1VV" id="3OPtF03lc_V" role="1B3o_S" />
     <node concept="16euLQ" id="3OPtF03lc_W" role="16eVyc">
       <property role="TrG5h" value="T" />
@@ -10963,7 +11863,7 @@
         <property role="TrG5h" value="children" />
         <node concept="10Q1$e" id="5s497VqXwHD" role="1tU5fm">
           <node concept="3uibUv" id="5s497VqXwHE" role="10Q1$1">
-            <ref role="3uigEE" node="1msb0mq9ID4" resolve="Branch" />
+            <ref role="3uigEE" node="1bm7a6EXvsP" resolve="ITreePart" />
             <node concept="3qTvmN" id="5s497VqXwHF" role="11_B2D" />
           </node>
         </node>