diff --git a/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl b/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
index 0e3d43b1..28139d19 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
+++ b/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
@@ -41,16 +41,11 @@
         <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
         <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
         <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
-        <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
       </dependencyVersions>
       <mapping-priorities />
     </generator>
   </generators>
   <sourcePath />
-  <dependencies>
-    <dependency reexport="false">06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)</dependency>
-    <dependency reexport="false">ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)</dependency>
-  </dependencies>
   <languageVersions>
     <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="5" />
     <language slang="l:443f4c36-fcf5-4eb6-9500-8d06ed259e3e:jetbrains.mps.baseLanguage.classifiers" version="0" />
@@ -102,10 +97,7 @@
     <module reference="a9e4c532-c5f5-4bb7-99ef-42abb73bbb70(jetbrains.mps.lang.descriptor.aspects)" version="0" />
     <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
     <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
-    <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
   </dependencyVersions>
-  <extendedLanguages>
-    <extendedLanguage>ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)</extendedLanguage>
-  </extendedLanguages>
+  <extendedLanguages />
 </language>
 
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
index dc4c3b1a..b4b85c8b 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
@@ -6,7 +6,6 @@
     <devkit ref="78434eb8-b0e5-444b-850d-e7c4ad2da9ab(jetbrains.mps.devkit.aspect.structure)" />
   </languages>
   <imports>
-    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
   </imports>
   <registry>
@@ -124,7 +123,7 @@
       <property role="20lmBu" value="aggregation" />
       <property role="20kJfa" value="conclusion" />
       <property role="20lbJX" value="1" />
-      <ref role="20lvS9" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="20lvS9" node="4LBPYGV4cY1" resolve="LogicalSentence" />
     </node>
     <node concept="PrWs8" id="3JXBM6C4o1Q" role="PrDN$">
       <ref role="PrY4T" node="3JXBM6C4ntZ" resolve="Leaf" />
@@ -296,7 +295,7 @@
       <property role="20lmBu" value="aggregation" />
       <property role="20kJfa" value="sentence" />
       <property role="20lbJX" value="1" />
-      <ref role="20lvS9" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="20lvS9" node="4LBPYGV4cY1" resolve="LogicalSentence" />
     </node>
   </node>
   <node concept="1TIwiD" id="2aBGSFge6pw">
@@ -317,5 +316,9 @@
     <property role="3GE5qa" value="proof" />
     <property role="TrG5h" value="Proposition" />
   </node>
+  <node concept="PlHQZ" id="4LBPYGV4cY1">
+    <property role="EcuMT" value="5505606474791964545" />
+    <property role="TrG5h" value="LogicalSentence" />
+  </node>
 </model>
 
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
index 5a1d554c..a8f8f89b 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
@@ -3,70 +3,21 @@
   <persistence version="9" />
   <languages>
     <use id="c4803b19-6d89-4a3b-bf82-390769514add" name="jetbrains.mps.lang.typesystem2" version="7" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="5" />
     <devkit ref="2677cb18-f558-4e33-bc38-a5139cee06dc(jetbrains.mps.devkit.language-design)" />
   </languages>
   <imports>
     <import index="jfgh" ref="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
-    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
-    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
-      <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="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" />
-      </concept>
       <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="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
-      <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="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="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>
-      <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="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="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
-      <concept id="1081773326031" name="jetbrains.mps.baseLanguage.structure.BinaryOperation" flags="nn" index="3uHJSO">
-        <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="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>
-      <concept id="1080120340718" name="jetbrains.mps.baseLanguage.structure.AndExpression" flags="nn" index="1Wc70l" />
     </language>
     <language id="3a13115c-633c-4c5c-bbcc-75c4219e9555" name="jetbrains.mps.lang.quotation">
       <concept id="5455284157993863837" name="jetbrains.mps.lang.quotation.structure.NodeBuilder" flags="nn" index="2pJPEk">
@@ -77,67 +28,17 @@
       </concept>
     </language>
     <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
-      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.Splice" flags="ng" index="22Ky0T">
-        <child id="238586457668550958" name="expression" index="22Ky0K" />
-      </concept>
       <concept id="8169506320648805904" name="jetbrains.mps.logic.structure.LogicalVariableDeclarationContainer" flags="ng" index="29MRiA">
         <child id="6399471711045617306" name="dataType" index="3vLBG7" />
         <child id="3063948360254832884" name="declaration" index="3XD1gS" />
       </concept>
       <concept id="8829335963593820278" name="jetbrains.mps.logic.structure.LogicalVariable" flags="ng" index="a7P8L">
         <reference id="8829335963593822893" name="declaration" index="a7OzE" />
-        <child id="6036655413806858011" name="indexExpr" index="3gCZO6" />
-      </concept>
-      <concept id="8829335963591530299" name="jetbrains.mps.logic.structure.ExpressionLogicalVariable" flags="ng" index="aZ4PW">
-        <child id="8829335963591530990" name="expression" index="aZ4eD" />
-      </concept>
-      <concept id="8829335963591572611" name="jetbrains.mps.logic.structure.LogicalVariableDeclaration" flags="ng" index="aZer4">
-        <child id="6036655413809169524" name="cardinalityExpr" index="3gj$pD" />
-      </concept>
-      <concept id="2784663291567294648" name="jetbrains.mps.logic.structure.Wildcard" flags="ng" index="2IllgU" />
-      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.List" flags="ng" index="KCUsM">
-        <child id="2105510410850136264" name="contents" index="KCVpo" />
-      </concept>
-      <concept id="4780620083400582599" name="jetbrains.mps.logic.structure.LogicalExpression" flags="ng" index="1nq8_$">
-        <child id="4780620083400582654" name="logical" index="1nq8_t" />
-      </concept>
-      <concept id="7571593955706120730" name="jetbrains.mps.logic.structure.TreeFormExpression" flags="ng" index="1oi1Uc">
-        <child id="7571593955706125526" name="root" index="1oi0x0" />
-      </concept>
-      <concept id="7571593955706137125" name="jetbrains.mps.logic.structure.TermNode" flags="ng" index="1oi5UN" />
-      <concept id="5131913661993028914" name="jetbrains.mps.logic.structure.PatternLogicalVariable" flags="ng" index="1uarlV">
-        <child id="5131913661993028915" name="variable" index="1uarlU" />
-        <child id="5131913661993028917" name="value" index="1uarlW" />
       </concept>
+      <concept id="8829335963591572611" name="jetbrains.mps.logic.structure.LogicalVariableDeclaration" flags="ng" index="aZer4" />
     </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="2396822768958367367" name="jetbrains.mps.lang.smodel.structure.AbstractTypeCastExpression" flags="nn" index="$5XWr">
-        <child id="6733348108486823193" name="leftExpression" index="1m5AlR" />
-        <child id="3906496115198199033" name="conceptArgument" index="3oSUPX" />
-      </concept>
-      <concept id="1145383075378" name="jetbrains.mps.lang.smodel.structure.SNodeListType" flags="in" index="2I9FWS" />
-      <concept id="1139613262185" name="jetbrains.mps.lang.smodel.structure.Node_GetParentOperation" flags="nn" index="1mfA1w" />
-      <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="1140137987495" name="jetbrains.mps.lang.smodel.structure.SNodeTypeCastExpression" flags="nn" index="1PxgMI">
-        <property id="1238684351431" name="asCast" index="1BlNFB" />
-      </concept>
-      <concept id="1138055754698" name="jetbrains.mps.lang.smodel.structure.SNodeType" flags="in" index="3Tqbb2">
-        <reference id="1138405853777" name="concept" index="ehGHo" />
-      </concept>
-      <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>
+      <concept id="1138055754698" name="jetbrains.mps.lang.smodel.structure.SNodeType" flags="in" index="3Tqbb2" />
     </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">
@@ -147,42 +48,16 @@
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
     </language>
-    <language id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections">
-      <concept id="1162935959151" name="jetbrains.mps.baseLanguage.collections.structure.GetSizeOperation" flags="nn" index="34oBXx" />
-      <concept id="1165525191778" name="jetbrains.mps.baseLanguage.collections.structure.GetFirstOperation" flags="nn" index="1uHKPH" />
-      <concept id="1225711141656" name="jetbrains.mps.baseLanguage.collections.structure.ListElementAccessExpression" flags="nn" index="1y4W85">
-        <child id="1225711182005" name="list" index="1y566C" />
-        <child id="1225711191269" name="index" index="1y58nS" />
-      </concept>
-      <concept id="1165595910856" name="jetbrains.mps.baseLanguage.collections.structure.GetLastOperation" flags="nn" index="1yVyf7" />
-      <concept id="1176501494711" name="jetbrains.mps.baseLanguage.collections.structure.IsNotEmptyOperation" flags="nn" index="3GX2aA" />
-    </language>
     <language id="c4803b19-6d89-4a3b-bf82-390769514add" name="jetbrains.mps.lang.typesystem2">
-      <concept id="1618328391714701929" name="jetbrains.mps.lang.typesystem2.structure.TermTemplate" flags="ng" index="0oftK">
-        <child id="1618328391714701961" name="feature" index="0ofug" />
-      </concept>
-      <concept id="1618328391714701966" name="jetbrains.mps.lang.typesystem2.structure.ValueTermFeature" flags="ng" index="0ofun" />
-      <concept id="1618328391714701958" name="jetbrains.mps.lang.typesystem2.structure.ListTermFeature" flags="ng" index="0ofuv" />
-      <concept id="1618328391714702001" name="jetbrains.mps.lang.typesystem2.structure.ChildTermFeature" flags="ng" index="0ofuC" />
-      <concept id="1618328391714763069" name="jetbrains.mps.lang.typesystem2.structure.MacroTable" flags="ng" index="0oKg$">
-        <child id="1618328391714763070" name="macro" index="0oKgB" />
-      </concept>
-      <concept id="1618328391714763491" name="jetbrains.mps.lang.typesystem2.structure.MacroDeclaration" flags="ng" index="0oKvU">
-        <child id="7670825977262353027" name="input" index="3eYTkm" />
-        <child id="8908809128802132746" name="parameter" index="3tC56T" />
-        <child id="8908809128801952514" name="body" index="3unh6L" />
-      </concept>
+      <concept id="1618328391714701929" name="jetbrains.mps.lang.typesystem2.structure.TermTemplate" flags="ng" index="0oftK" />
       <concept id="6086839168138086051" name="jetbrains.mps.lang.typesystem2.structure.TermTable" flags="ng" index="1HGPq">
         <child id="6086839168138086052" name="termDeclaration" index="1HGPt" />
       </concept>
-      <concept id="4992889260816483106" name="jetbrains.mps.lang.typesystem2.structure.Condition" flags="ng" index="cBwPQ" />
       <concept id="6691972578451976398" name="jetbrains.mps.lang.typesystem2.structure.RuleInputSpecification" flags="ng" index="2t___k">
         <reference id="6691972578451990912" name="applicableConcept" index="2t_S0q" />
         <child id="6691972578451986151" name="input" index="2t_VXX" />
       </concept>
-      <concept id="8335224865066016388" name="jetbrains.mps.lang.typesystem2.structure.Rule" flags="ng" index="AVZhu">
-        <child id="4340821131304055573" name="condition" index="30RCb4" />
-      </concept>
+      <concept id="8335224865066016388" name="jetbrains.mps.lang.typesystem2.structure.Rule" flags="ng" index="AVZhu" />
       <concept id="8335224865066015764" name="jetbrains.mps.lang.typesystem2.structure.Handler" flags="ng" index="AVZre">
         <property id="2316688792951788157" name="stage" index="3J8TDj" />
         <child id="1980609059185345194" name="constraint" index="8PkJo" />
@@ -194,28 +69,6 @@
       <concept id="6856711987714624232" name="jetbrains.mps.lang.typesystem2.structure.ExpressionItem" flags="ng" index="HKQnh">
         <child id="6856711987714624233" name="code" index="HKQng" />
       </concept>
-      <concept id="7670825977262541651" name="jetbrains.mps.lang.typesystem2.structure.MacroInputReference" flags="ng" index="3eTFj6">
-        <reference id="7670825977262541652" name="declaration" index="3eTFj1" />
-      </concept>
-      <concept id="7670825977262339471" name="jetbrains.mps.lang.typesystem2.structure.MacroInputDeclaration" flags="ng" index="3eYOCq">
-        <child id="7670825977262355988" name="type" index="3eYSA1" />
-      </concept>
-      <concept id="1302893676238672057" name="jetbrains.mps.lang.typesystem2.structure.ExpandPseudoConstraint" flags="ng" index="1imXTs">
-        <child id="1302893676238674275" name="logical" index="1imXu6" />
-        <child id="1302893676238672106" name="origin" index="1imXSf" />
-      </concept>
-      <concept id="8908809128804390455" name="jetbrains.mps.lang.typesystem2.structure.MacroLogicalExpression" flags="ng" index="3txIi4" />
-      <concept id="8908809128802132672" name="jetbrains.mps.lang.typesystem2.structure.MacroParameterDeclaration" flags="ng" index="3tC51N">
-        <child id="8908809128802132718" name="type" index="3tC51t" />
-        <child id="8908809128803441142" name="init" index="3tH6H5" />
-      </concept>
-      <concept id="8908809128802381130" name="jetbrains.mps.lang.typesystem2.structure.MacroParameterReference" flags="ng" index="3tDTZT">
-        <reference id="8908809128802381395" name="parameter" index="3tDTNw" />
-      </concept>
-      <concept id="8908809128803504920" name="jetbrains.mps.lang.typesystem2.structure.InitBlock" flags="ng" index="3tHm6F" />
-      <concept id="8908809128801951589" name="jetbrains.mps.lang.typesystem2.structure.MacroBody" flags="ng" index="3uniRm">
-        <child id="8908809128801951592" name="code" index="3uniRr" />
-      </concept>
       <concept id="5372587443975633709" name="jetbrains.mps.lang.typesystem2.structure.AbstractRule" flags="ng" index="3wqRzX">
         <child id="7509376976631847095" name="input" index="20_v8_" />
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@@ -239,9 +92,6 @@
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@@ -249,10 +99,6 @@
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@@ -267,5282 +113,8 @@
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-                          <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
-                        </node>
-                        <node concept="2OqwBi" id="2YqrT$P7QYA" role="1m5AlR">
-                          <node concept="3A2sRY" id="2YqrT$P7QYB" role="2Oq$k0">
-                            <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
-                          </node>
-                          <node concept="1mfA1w" id="2YqrT$P7QYC" role="2OqNvi" />
-                        </node>
-                      </node>
-                      <node concept="3Tsc0h" id="2YqrT$P7QYD" role="2OqNvi">
-                        <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
-                      </node>
-                    </node>
-                    <node concept="1yVyf7" id="2YqrT$P7QYE" role="2OqNvi" />
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3I6s7M" id="2YqrT$P7RG8" role="3I6sU7">
-            <node concept="3Aqt3T" id="2YqrT$P7RG6" role="3I6s78">
-              <ref role="3AqCNq" node="2YqrT$P7RE$" resolve="goal" />
-              <node concept="1uarlV" id="2AfSc6JxERZ" role="3AunhB">
-                <node concept="a7P8L" id="9AXE3xO8D9" role="1uarlU">
-                  <ref role="a7OzE" node="2YqrT$P7QXz" resolve="Goal" />
-                </node>
-                <node concept="a7P8L" id="2AfSc6JxESd" role="1uarlW">
-                  <ref role="a7OzE" node="2YqrT$P7QXD" resolve="ProofCon" />
-                </node>
-              </node>
-              <node concept="3BlFb$" id="2YqrT$P7RGQ" role="3AunhB">
-                <node concept="3A2sRY" id="2YqrT$P7RH2" role="3BlFb_">
-                  <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3NuqgR" id="2YqrT$P7QXy" role="3Nuqhd">
-          <node concept="aZer4" id="2YqrT$P7QXz" role="3XD1gS">
-            <property role="TrG5h" value="Goal" />
-          </node>
-          <node concept="aZer4" id="2YqrT$P7QXD" role="3XD1gS">
-            <property role="TrG5h" value="ProofCon" />
-          </node>
-        </node>
-      </node>
-      <node concept="3Aq93q" id="2YqrT$P7I4B" role="3orSU4">
-        <property role="3ArMco" value="true" />
-        <node concept="3I6sU6" id="2YqrT$P7I4C" role="3Ip0Jz">
-          <node concept="3I6s7M" id="2YqrT$P7QRU" role="3I6sU7">
-            <node concept="3Aqt3T" id="2YqrT$P7QRT" role="3I6s78">
-              <ref role="3AqCNq" node="2YqrT$P7tud" resolve="valid" />
-              <node concept="3BlFb$" id="2YqrT$P7QRZ" role="3AunhB">
-                <node concept="2OqwBi" id="2YqrT$P7QS8" role="3BlFb_">
-                  <node concept="2OqwBi" id="2YqrT$P7QS9" role="2Oq$k0">
-                    <node concept="1PxgMI" id="2YqrT$P7QSa" role="2Oq$k0">
-                      <property role="1BlNFB" value="true" />
-                      <node concept="chp4Y" id="2YqrT$P7QSb" role="3oSUPX">
-                        <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
-                      </node>
-                      <node concept="2OqwBi" id="2YqrT$P7QSc" role="1m5AlR">
-                        <node concept="3A2sRY" id="2YqrT$P7QSd" role="2Oq$k0">
-                          <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
-                        </node>
-                        <node concept="1mfA1w" id="2YqrT$P7QSe" role="2OqNvi" />
-                      </node>
-                    </node>
-                    <node concept="3Tsc0h" id="2YqrT$P7QSf" role="2OqNvi">
-                      <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
-                    </node>
-                  </node>
-                  <node concept="1yVyf7" id="2YqrT$P7QSg" role="2OqNvi" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="2t___k" id="2YqrT$P7I4j" role="20_v8_">
-        <ref role="2t_S0q" to="jfgh:$u9BK__SA8" resolve="Goal" />
-        <node concept="3A20r5" id="2YqrT$P7I4k" role="2t_VXX">
-          <property role="TrG5h" value="goal" />
-        </node>
-      </node>
-      <node concept="cBwPQ" id="2YqrT$P7I55" role="30RCb4">
-        <node concept="3clFbS" id="2YqrT$P7I56" role="16YjZG">
-          <node concept="3clFbF" id="2YqrT$P7I5j" role="3cqZAp">
-            <node concept="2OqwBi" id="9AXE3xOn6V" role="3clFbG">
-              <node concept="2OqwBi" id="2YqrT$P7LVa" role="2Oq$k0">
-                <node concept="2OqwBi" id="2YqrT$P7JQA" role="2Oq$k0">
-                  <node concept="1PxgMI" id="2YqrT$P7J$X" role="2Oq$k0">
-                    <property role="1BlNFB" value="true" />
-                    <node concept="chp4Y" id="2YqrT$P7JEG" role="3oSUPX">
-                      <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
-                    </node>
-                    <node concept="2OqwBi" id="2YqrT$P7IdR" role="1m5AlR">
-                      <node concept="3A2sRY" id="2YqrT$P7I5i" role="2Oq$k0">
-                        <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
-                      </node>
-                      <node concept="1mfA1w" id="2YqrT$P7Ir0" role="2OqNvi" />
-                    </node>
-                  </node>
-                  <node concept="3Tsc0h" id="2YqrT$P7KoQ" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
-                  </node>
-                </node>
-                <node concept="1yVyf7" id="2YqrT$P7OLn" role="2OqNvi" />
-              </node>
-              <node concept="1mIQ4w" id="9AXE3xOnzG" role="2OqNvi">
-                <node concept="chp4Y" id="9AXE3xOnDd" role="cj9EA">
-                  <ref role="cht4Q" to="jfgh:3JXBM6C3OtS" resolve="Reasoning" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="3Aq9E8" id="2YqrT$P7S7$" role="3otmyu">
-        <node concept="3I6sU6" id="2YqrT$P7S7_" role="3Ip0Jz">
-          <node concept="3I6s7M" id="2YqrT$P7Sr7" role="3I6sU7">
-            <node concept="3Aqt3T" id="2YqrT$P7Sr6" role="3I6s78">
-              <ref role="3AqCNq" node="2YqrT$P7tud" resolve="valid" />
-              <node concept="3BlFb$" id="9AXE3xOzaf" role="3AunhB">
-                <node concept="3A2sRY" id="9AXE3xOzat" role="3BlFb_">
-                  <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
-                </node>
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="3AqmO8" id="2YqrT$P7tud" role="8PkJo">
-      <property role="TrG5h" value="valid" />
-      <node concept="1zAUYm" id="2YqrT$P7tui" role="1zAUyy">
-        <property role="TrG5h" value="rsn" />
-      </node>
-      <node concept="1zAsnw" id="3l440nVsJkw" role="lGtFl">
-        <node concept="3SKdUq" id="3l440nVsJkx" role="27qylF">
-          <property role="3SKdUp" value="reasoning is valid" />
-        </node>
-      </node>
-    </node>
-    <node concept="3AqmO8" id="2aBGSFgfwNi" role="8PkJo">
-      <property role="TrG5h" value="conclusion" />
-      <node concept="1zAUYm" id="2aBGSFgfwNl" role="1zAUyy">
-        <property role="TrG5h" value="stc" />
-      </node>
-      <node concept="1zAUYm" id="2aBGSFgfwNn" role="1zAUyy">
-        <property role="TrG5h" value="rsn" />
-      </node>
-      <node concept="1zAsnw" id="3l440nVsJk$" role="lGtFl">
-        <node concept="3SKdUq" id="3l440nVsJk_" role="27qylF">
-          <property role="3SKdUp" value="sentence is the reasoning's conclusion" />
-        </node>
-      </node>
-    </node>
-    <node concept="3AqmO8" id="2YqrT$P7RE$" role="8PkJo">
-      <property role="TrG5h" value="goal" />
-      <node concept="1zAUYm" id="2YqrT$P7REF" role="1zAUyy">
-        <property role="TrG5h" value="stc" />
-      </node>
-      <node concept="1zAUYm" id="2YqrT$P7REH" role="1zAUyy">
-        <property role="TrG5h" value="goal" />
-      </node>
-      <node concept="1zAsnw" id="3l440nVsJkI" role="lGtFl">
-        <node concept="3SKdUq" id="3l440nVsJkJ" role="27qylF">
-          <property role="3SKdUp" value="sentence is the proof's goal" />
-        </node>
-      </node>
-    </node>
-  </node>
   <node concept="1HGPq" id="5RfK0kxl_Hp">
     <property role="TrG5h" value="Types" />
     <node concept="BRKj$" id="5RfK0kxl_Hq" role="1HGPt">
@@ -5565,6 +137,17 @@
         <property role="TrG5h" value="rsn" />
       </node>
     </node>
+    <node concept="3AqmO8" id="2YqrT$P7tud" role="8PkJo">
+      <property role="TrG5h" value="valid" />
+      <node concept="1zAUYm" id="2YqrT$P7tui" role="1zAUyy">
+        <property role="TrG5h" value="rsn" />
+      </node>
+      <node concept="1zAsnw" id="3l440nVsJkw" role="lGtFl">
+        <node concept="3SKdUq" id="3l440nVsJkx" role="27qylF">
+          <property role="3SKdUp" value="reasoning is valid" />
+        </node>
+      </node>
+    </node>
     <node concept="3AqmO8" id="2aBGSFge6oW" role="8PkJo">
       <property role="TrG5h" value="typeNode" />
       <node concept="1zAUYm" id="2aBGSFge6p4" role="1zAUyy">
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl b/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl
index 18f0cdc1..e7991be8 100644
--- a/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl
@@ -85,6 +85,8 @@
     <language slang="l:b83431fe-5c8f-40bc-8a36-65e25f4dd253:jetbrains.mps.lang.textGen" version="1" />
     <language slang="l:9ded098b-ad6a-4657-bfd9-48636cfe8bc3:jetbrains.mps.lang.traceable" version="0" />
     <language slang="l:7a5dda62-9140-4668-ab76-d5ed1746f2b2:jetbrains.mps.lang.typesystem" version="1" />
+    <language slang="l:c4803b19-6d89-4a3b-bf82-390769514add:jetbrains.mps.lang.typesystem2" version="7" />
+    <language slang="l:35320f26-77cb-4c55-be9f-a97a27770af1:jetbrains.mps.logic" version="2" />
   </languageVersions>
   <dependencyVersions>
     <module reference="3f233e7f-b8a6-46d2-a57f-795d56775243(Annotations)" version="0" />
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps
index d03c92cf..712fc90c 100644
--- a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps
@@ -17,7 +17,9 @@
         <property id="5092175715804935370" name="conceptAlias" index="34LRSv" />
         <child id="1071489727083" name="linkDeclaration" index="1TKVEi" />
       </concept>
-      <concept id="1169125989551" name="jetbrains.mps.lang.structure.structure.InterfaceConceptDeclaration" flags="ig" index="PlHQZ" />
+      <concept id="1169125989551" name="jetbrains.mps.lang.structure.structure.InterfaceConceptDeclaration" flags="ig" index="PlHQZ">
+        <child id="1169127546356" name="extends" index="PrDN$" />
+      </concept>
       <concept id="1169127622168" name="jetbrains.mps.lang.structure.structure.InterfaceConceptReference" flags="ig" index="PrWs8">
         <reference id="1169127628841" name="intfc" index="PrY4T" />
       </concept>
@@ -156,6 +158,9 @@
     <property role="EcuMT" value="4322786184247805402" />
     <property role="TrG5h" value="Sentence" />
     <property role="3GE5qa" value="sentence" />
+    <node concept="PrWs8" id="4LBPYGV4d_8" role="PrDN$">
+      <ref role="PrY4T" to="jfgh:4LBPYGV4cY1" resolve="LogicalSentence" />
+    </node>
   </node>
 </model>
 
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/types.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/types.mps
new file mode 100644
index 00000000..70ef4d1f
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/types.mps
@@ -0,0 +1,5523 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:30d249b0-c2b0-4934-8bd8-e1d7a37c3b3b(jetbrains.mps.logic.propositional.types)">
+  <persistence version="9" />
+  <languages>
+    <use id="c4803b19-6d89-4a3b-bf82-390769514add" name="jetbrains.mps.lang.typesystem2" version="7" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="5" />
+    <use id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel" version="8" />
+    <use id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic" version="2" />
+    <use id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections" version="0" />
+    <devkit ref="2677cb18-f558-4e33-bc38-a5139cee06dc(jetbrains.mps.devkit.language-design)" />
+  </languages>
+  <imports>
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" />
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+    <import index="f3ld" ref="r:30efdd3a-609b-4e7b-a8f2-60af62d5341f(jetbrains.mps.fitch.types)" />
+    <import index="jfgh" ref="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+  </imports>
+  <registry>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <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="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" />
+      </concept>
+      <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
+      <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="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="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>
+      <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="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="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
+      <concept id="1081773326031" name="jetbrains.mps.baseLanguage.structure.BinaryOperation" flags="nn" index="3uHJSO">
+        <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="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>
+      <concept id="1080120340718" name="jetbrains.mps.baseLanguage.structure.AndExpression" flags="nn" index="1Wc70l" />
+    </language>
+    <language id="35320f26-77cb-4c55-be9f-a97a27770af1" name="jetbrains.mps.logic">
+      <concept id="238586457668550951" name="jetbrains.mps.logic.structure.Splice" flags="ng" index="22Ky0T">
+        <child id="238586457668550958" name="expression" index="22Ky0K" />
+      </concept>
+      <concept id="8169506320648805904" name="jetbrains.mps.logic.structure.LogicalVariableDeclarationContainer" flags="ng" index="29MRiA">
+        <child id="3063948360254832884" name="declaration" index="3XD1gS" />
+      </concept>
+      <concept id="8829335963593820278" name="jetbrains.mps.logic.structure.LogicalVariable" flags="ng" index="a7P8L">
+        <reference id="8829335963593822893" name="declaration" index="a7OzE" />
+        <child id="6036655413806858011" name="indexExpr" index="3gCZO6" />
+      </concept>
+      <concept id="8829335963591530299" name="jetbrains.mps.logic.structure.ExpressionLogicalVariable" flags="ng" index="aZ4PW">
+        <child id="8829335963591530990" name="expression" index="aZ4eD" />
+      </concept>
+      <concept id="8829335963591572611" name="jetbrains.mps.logic.structure.LogicalVariableDeclaration" flags="ng" index="aZer4">
+        <child id="6036655413809169524" name="cardinalityExpr" index="3gj$pD" />
+      </concept>
+      <concept id="2784663291567294648" name="jetbrains.mps.logic.structure.Wildcard" flags="ng" index="2IllgU" />
+      <concept id="2105510410850132386" name="jetbrains.mps.logic.structure.List" flags="ng" index="KCUsM">
+        <child id="2105510410850136264" name="contents" index="KCVpo" />
+      </concept>
+      <concept id="4780620083400582599" name="jetbrains.mps.logic.structure.LogicalExpression" flags="ng" index="1nq8_$">
+        <child id="4780620083400582654" name="logical" index="1nq8_t" />
+      </concept>
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+                          </node>
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+                    </node>
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+                            <node concept="a7P8L" id="2YqrT$P64EI" role="1nq8_t">
+                              <ref role="a7OzE" node="2YqrT$P64tc" resolve="Csqt" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
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+                          <node concept="1uHKPH" id="2AfSc6JtSgH" role="2OqNvi" />
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+                        <node concept="3TrEf2" id="2AfSc6JtZAT" role="2OqNvi">
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+                        <ref role="cht4Q" to="jfgh:3JXBM6C3UQ$" resolve="SubProof" />
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+                      <node concept="2OqwBi" id="2AfSc6Ju0hF" role="1m5AlR">
+                        <node concept="2OqwBi" id="2AfSc6Ju0hG" role="2Oq$k0">
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+                            <node concept="3Tsc0h" id="2AfSc6Ju0hJ" role="2OqNvi">
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+                          <node concept="1uHKPH" id="2AfSc6Ju0hK" role="2OqNvi" />
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+                        <node concept="3TrEf2" id="2AfSc6Ju0hL" role="2OqNvi">
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+                        <ref role="cht4Q" to="jfgh:3JXBM6C3UQ$" resolve="SubProof" />
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+                      <node concept="2OqwBi" id="2AfSc6Jug2$" role="1m5AlR">
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+                          <node concept="1uHKPH" id="2AfSc6Jug2D" role="2OqNvi" />
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+                        <node concept="3TrEf2" id="2AfSc6Jug2E" role="2OqNvi">
+                          <ref role="3Tt5mk" to="jfgh:3JXBM6C3FuH" resolve="reasoning" />
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+            <node concept="3Aqt3T" id="3l440nVqJl2" role="3I6s78">
+              <ref role="3AqCNq" node="2aBGSFgfwNi" resolve="conclusion" />
+              <node concept="1uarlV" id="3l440nVqJl3" role="3AunhB">
+                <node concept="a7P8L" id="3l440nVqJl4" role="1uarlU">
+                  <ref role="a7OzE" node="3l440nVqJls" resolve="Prem" />
+                </node>
+                <node concept="1Q4cc8" id="3l440nVqJl5" role="1uarlW">
+                  <ref role="1nfQt" node="5RfK0kxiwle" resolve="Iff" />
+                  <node concept="1RziaG" id="3l440nVqJl6" role="1Ryyee">
+                    <ref role="1RzibV" node="5RfK0kxiwl$" resolve="antecedent" />
+                    <node concept="3AP2Rn" id="3l440nVqJl7" role="1RzmR7">
+                      <node concept="3clFbS" id="3l440nVqJl8" role="16YjZG">
+                        <node concept="3clFbF" id="3l440nVqJl9" role="3cqZAp">
+                          <node concept="1nq8_$" id="3l440nVqJla" role="3clFbG">
+                            <node concept="a7P8L" id="3l440nVqKhl" role="1nq8_t">
+                              <ref role="a7OzE" node="3l440nVqJlu" resolve="Csqt" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="1RziaG" id="3l440nVqJlc" role="1Ryyee">
+                    <ref role="1RzibV" node="5RfK0kxiwlE" resolve="consequence" />
+                    <node concept="3AP2Rn" id="3l440nVqJld" role="1RzmR7">
+                      <node concept="3clFbS" id="3l440nVqJle" role="16YjZG">
+                        <node concept="3clFbF" id="3l440nVqJlf" role="3cqZAp">
+                          <node concept="1nq8_$" id="3l440nVqJlg" role="3clFbG">
+                            <node concept="a7P8L" id="3l440nVqKpT" role="1nq8_t">
+                              <ref role="a7OzE" node="3l440nVqJlt" resolve="Acdt" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="3BlFb$" id="3l440nVqJli" role="3AunhB">
+                <node concept="2OqwBi" id="3l440nVqJlj" role="3BlFb_">
+                  <node concept="2OqwBi" id="3l440nVqJlk" role="2Oq$k0">
+                    <node concept="2OqwBi" id="3l440nVqJll" role="2Oq$k0">
+                      <node concept="3A2sRY" id="3l440nVqJlm" role="2Oq$k0">
+                        <ref role="3A2yKK" node="3l440nVqJlG" resolve="iffe" />
+                      </node>
+                      <node concept="3Tsc0h" id="3l440nVqJln" role="2OqNvi">
+                        <ref role="3TtcxE" to="jfgh:3JXBM6C3MQ0" resolve="premise" />
+                      </node>
+                    </node>
+                    <node concept="1uHKPH" id="3l440nVqJlo" role="2OqNvi" />
+                  </node>
+                  <node concept="3TrEf2" id="3l440nVqJlp" role="2OqNvi">
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FuH" resolve="reasoning" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3NuqgR" id="3l440nVqJlq" role="3Nuqhd">
+          <node concept="aZer4" id="3l440nVqJlr" role="3XD1gS">
+            <property role="TrG5h" value="Con" />
+          </node>
+          <node concept="aZer4" id="3l440nVqJls" role="3XD1gS">
+            <property role="TrG5h" value="Prem" />
+          </node>
+          <node concept="aZer4" id="3l440nVqJlt" role="3XD1gS">
+            <property role="TrG5h" value="Acdt" />
+          </node>
+          <node concept="aZer4" id="3l440nVqJlu" role="3XD1gS">
+            <property role="TrG5h" value="Csqt" />
+          </node>
+        </node>
+      </node>
+      <node concept="3Aq93q" id="3l440nVqJlv" role="3orSU4">
+        <property role="3ArMco" value="true" />
+        <node concept="3I6sU6" id="3l440nVqJlw" role="3Ip0Jz">
+          <node concept="3I6s7M" id="3l440nVqJlx" role="3I6sU7">
+            <node concept="3Aqt3T" id="3l440nVqJly" role="3I6s78">
+              <ref role="3AqCNq" to="f3ld:2YqrT$P7tud" resolve="valid" />
+              <node concept="3BlFb$" id="3l440nVqJlz" role="3AunhB">
+                <node concept="2OqwBi" id="3l440nVqJl$" role="3BlFb_">
+                  <node concept="2OqwBi" id="3l440nVqJl_" role="2Oq$k0">
+                    <node concept="2OqwBi" id="3l440nVqJlA" role="2Oq$k0">
+                      <node concept="3A2sRY" id="3l440nVqJlB" role="2Oq$k0">
+                        <ref role="3A2yKK" node="3l440nVqJlG" resolve="iffe" />
+                      </node>
+                      <node concept="3Tsc0h" id="3l440nVqJlC" role="2OqNvi">
+                        <ref role="3TtcxE" to="jfgh:3JXBM6C3MQ0" resolve="premise" />
+                      </node>
+                    </node>
+                    <node concept="1uHKPH" id="3l440nVqJlD" role="2OqNvi" />
+                  </node>
+                  <node concept="3TrEf2" id="3l440nVqJlE" role="2OqNvi">
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FuH" resolve="reasoning" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2t___k" id="3l440nVqJlF" role="20_v8_">
+        <ref role="2t_S0q" to="jfgh:3JXBM6C3ZJo" resolve="IffElim" />
+        <node concept="3A20r5" id="3l440nVqJlG" role="2t_VXX">
+          <property role="TrG5h" value="iffe" />
+        </node>
+      </node>
+      <node concept="cBwPQ" id="3l440nVqJlH" role="30RCb4">
+        <node concept="3clFbS" id="3l440nVqJlI" role="16YjZG">
+          <node concept="3clFbF" id="3l440nVqJlJ" role="3cqZAp">
+            <node concept="3clFbC" id="3l440nVqJlK" role="3clFbG">
+              <node concept="3cmrfG" id="3l440nVqJlL" role="3uHU7w">
+                <property role="3cmrfH" value="1" />
+              </node>
+              <node concept="2OqwBi" id="3l440nVqJlM" role="3uHU7B">
+                <node concept="2OqwBi" id="3l440nVqJlN" role="2Oq$k0">
+                  <node concept="3A2sRY" id="3l440nVqJlO" role="2Oq$k0">
+                    <ref role="3A2yKK" node="3l440nVqJlG" resolve="iffe" />
+                  </node>
+                  <node concept="3Tsc0h" id="3l440nVqJlP" role="2OqNvi">
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3MQ0" resolve="premise" />
+                  </node>
+                </node>
+                <node concept="34oBXx" id="3l440nVqJlQ" role="2OqNvi" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="AVZhu" id="2AfSc6JuwTb" role="3ArX_J">
+      <property role="TrG5h" value="goal" />
+      <node concept="3Aq9E8" id="2AfSc6JuwTc" role="3otmyu">
+        <node concept="3I6sU6" id="2AfSc6JuwTd" role="3Ip0Jz">
+          <node concept="3I6s7M" id="2AfSc6JuwTe" role="3I6sU7">
+            <node concept="1imXTs" id="2AfSc6JuwTf" role="3I6s78">
+              <node concept="a7P8L" id="2AfSc6JuwTg" role="1imXu6">
+                <ref role="a7OzE" node="2AfSc6JuwTq" resolve="Goal" />
+              </node>
+              <node concept="2OqwBi" id="2AfSc6JuwTh" role="1imXSf">
+                <node concept="3A2sRY" id="2AfSc6JuwTi" role="2Oq$k0">
+                  <ref role="3A2yKK" node="2AfSc6JuwTs" resolve="goal" />
+                </node>
+                <node concept="3TrEf2" id="2AfSc6JuwTj" role="2OqNvi">
+                  <ref role="3Tt5mk" to="jfgh:$u9BK__SA9" resolve="sentence" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3I6s7M" id="2AfSc6JuwTk" role="3I6sU7">
+            <node concept="3Aqt3T" id="2AfSc6JuwTl" role="3I6s78">
+              <ref role="3AqCNq" node="2YqrT$P7RE$" resolve="goal" />
+              <node concept="a7P8L" id="2AfSc6JuwTm" role="3AunhB">
+                <ref role="a7OzE" node="2AfSc6JuwTq" resolve="Goal" />
+              </node>
+              <node concept="3BlFb$" id="2AfSc6JuwTn" role="3AunhB">
+                <node concept="3A2sRY" id="2AfSc6JuwTo" role="3BlFb_">
+                  <ref role="3A2yKK" node="2AfSc6JuwTs" resolve="goal" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3NuqgR" id="2AfSc6JuwTp" role="3Nuqhd">
+          <node concept="aZer4" id="2AfSc6JuwTq" role="3XD1gS">
+            <property role="TrG5h" value="Goal" />
+          </node>
+        </node>
+      </node>
+      <node concept="2t___k" id="2AfSc6JuwTr" role="20_v8_">
+        <ref role="2t_S0q" to="jfgh:$u9BK__SA8" resolve="Goal" />
+        <node concept="3A20r5" id="2AfSc6JuwTs" role="2t_VXX">
+          <property role="TrG5h" value="goal" />
+        </node>
+      </node>
+    </node>
+    <node concept="AVZhu" id="2YqrT$P7HVI" role="3ArX_J">
+      <property role="TrG5h" value="goal_valid" />
+      <node concept="3Aq93q" id="2YqrT$P7I4z" role="3orSU4">
+        <property role="3ArMco" value="true" />
+        <node concept="3I6sU6" id="2YqrT$P7I4$" role="3Ip0Jz">
+          <node concept="3I6s7M" id="2YqrT$P7QYb" role="3I6sU7">
+            <node concept="3Aqt3T" id="2YqrT$P7QYa" role="3I6s78">
+              <ref role="3AqCNq" node="2aBGSFgfwNi" resolve="conclusion" />
+              <node concept="a7P8L" id="2YqrT$P7QYg" role="3AunhB">
+                <ref role="a7OzE" node="2YqrT$P7QXD" resolve="ProofCon" />
+              </node>
+              <node concept="3BlFb$" id="2YqrT$P7QYo" role="3AunhB">
+                <node concept="1PxgMI" id="9AXE3xNo9X" role="3BlFb_">
+                  <property role="1BlNFB" value="true" />
+                  <node concept="chp4Y" id="9AXE3xNofB" role="3oSUPX">
+                    <ref role="cht4Q" to="jfgh:3JXBM6C3OtS" resolve="Reasoning" />
+                  </node>
+                  <node concept="2OqwBi" id="2YqrT$P7QYy" role="1m5AlR">
+                    <node concept="2OqwBi" id="2YqrT$P7QYz" role="2Oq$k0">
+                      <node concept="1PxgMI" id="2YqrT$P7QY$" role="2Oq$k0">
+                        <property role="1BlNFB" value="true" />
+                        <node concept="chp4Y" id="2YqrT$P7QY_" role="3oSUPX">
+                          <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
+                        </node>
+                        <node concept="2OqwBi" id="2YqrT$P7QYA" role="1m5AlR">
+                          <node concept="3A2sRY" id="2YqrT$P7QYB" role="2Oq$k0">
+                            <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
+                          </node>
+                          <node concept="1mfA1w" id="2YqrT$P7QYC" role="2OqNvi" />
+                        </node>
+                      </node>
+                      <node concept="3Tsc0h" id="2YqrT$P7QYD" role="2OqNvi">
+                        <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
+                      </node>
+                    </node>
+                    <node concept="1yVyf7" id="2YqrT$P7QYE" role="2OqNvi" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3I6s7M" id="2YqrT$P7RG8" role="3I6sU7">
+            <node concept="3Aqt3T" id="2YqrT$P7RG6" role="3I6s78">
+              <ref role="3AqCNq" node="2YqrT$P7RE$" resolve="goal" />
+              <node concept="1uarlV" id="2AfSc6JxERZ" role="3AunhB">
+                <node concept="a7P8L" id="9AXE3xO8D9" role="1uarlU">
+                  <ref role="a7OzE" node="2YqrT$P7QXz" resolve="Goal" />
+                </node>
+                <node concept="a7P8L" id="2AfSc6JxESd" role="1uarlW">
+                  <ref role="a7OzE" node="2YqrT$P7QXD" resolve="ProofCon" />
+                </node>
+              </node>
+              <node concept="3BlFb$" id="2YqrT$P7RGQ" role="3AunhB">
+                <node concept="3A2sRY" id="2YqrT$P7RH2" role="3BlFb_">
+                  <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3NuqgR" id="2YqrT$P7QXy" role="3Nuqhd">
+          <node concept="aZer4" id="2YqrT$P7QXz" role="3XD1gS">
+            <property role="TrG5h" value="Goal" />
+          </node>
+          <node concept="aZer4" id="2YqrT$P7QXD" role="3XD1gS">
+            <property role="TrG5h" value="ProofCon" />
+          </node>
+        </node>
+      </node>
+      <node concept="3Aq93q" id="2YqrT$P7I4B" role="3orSU4">
+        <property role="3ArMco" value="true" />
+        <node concept="3I6sU6" id="2YqrT$P7I4C" role="3Ip0Jz">
+          <node concept="3I6s7M" id="2YqrT$P7QRU" role="3I6sU7">
+            <node concept="3Aqt3T" id="2YqrT$P7QRT" role="3I6s78">
+              <ref role="3AqCNq" to="f3ld:2YqrT$P7tud" resolve="valid" />
+              <node concept="3BlFb$" id="2YqrT$P7QRZ" role="3AunhB">
+                <node concept="2OqwBi" id="2YqrT$P7QS8" role="3BlFb_">
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+                    <node concept="1PxgMI" id="2YqrT$P7QSa" role="2Oq$k0">
+                      <property role="1BlNFB" value="true" />
+                      <node concept="chp4Y" id="2YqrT$P7QSb" role="3oSUPX">
+                        <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
+                      </node>
+                      <node concept="2OqwBi" id="2YqrT$P7QSc" role="1m5AlR">
+                        <node concept="3A2sRY" id="2YqrT$P7QSd" role="2Oq$k0">
+                          <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
+                        </node>
+                        <node concept="1mfA1w" id="2YqrT$P7QSe" role="2OqNvi" />
+                      </node>
+                    </node>
+                    <node concept="3Tsc0h" id="2YqrT$P7QSf" role="2OqNvi">
+                      <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
+                    </node>
+                  </node>
+                  <node concept="1yVyf7" id="2YqrT$P7QSg" role="2OqNvi" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2t___k" id="2YqrT$P7I4j" role="20_v8_">
+        <ref role="2t_S0q" to="jfgh:$u9BK__SA8" resolve="Goal" />
+        <node concept="3A20r5" id="2YqrT$P7I4k" role="2t_VXX">
+          <property role="TrG5h" value="goal" />
+        </node>
+      </node>
+      <node concept="cBwPQ" id="2YqrT$P7I55" role="30RCb4">
+        <node concept="3clFbS" id="2YqrT$P7I56" role="16YjZG">
+          <node concept="3clFbF" id="2YqrT$P7I5j" role="3cqZAp">
+            <node concept="2OqwBi" id="9AXE3xOn6V" role="3clFbG">
+              <node concept="2OqwBi" id="2YqrT$P7LVa" role="2Oq$k0">
+                <node concept="2OqwBi" id="2YqrT$P7JQA" role="2Oq$k0">
+                  <node concept="1PxgMI" id="2YqrT$P7J$X" role="2Oq$k0">
+                    <property role="1BlNFB" value="true" />
+                    <node concept="chp4Y" id="2YqrT$P7JEG" role="3oSUPX">
+                      <ref role="cht4Q" to="jfgh:3JXBM6C3Fs$" resolve="Proof" />
+                    </node>
+                    <node concept="2OqwBi" id="2YqrT$P7IdR" role="1m5AlR">
+                      <node concept="3A2sRY" id="2YqrT$P7I5i" role="2Oq$k0">
+                        <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
+                      </node>
+                      <node concept="1mfA1w" id="2YqrT$P7Ir0" role="2OqNvi" />
+                    </node>
+                  </node>
+                  <node concept="3Tsc0h" id="2YqrT$P7KoQ" role="2OqNvi">
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C4wQA" resolve="content" />
+                  </node>
+                </node>
+                <node concept="1yVyf7" id="2YqrT$P7OLn" role="2OqNvi" />
+              </node>
+              <node concept="1mIQ4w" id="9AXE3xOnzG" role="2OqNvi">
+                <node concept="chp4Y" id="9AXE3xOnDd" role="cj9EA">
+                  <ref role="cht4Q" to="jfgh:3JXBM6C3OtS" resolve="Reasoning" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3Aq9E8" id="2YqrT$P7S7$" role="3otmyu">
+        <node concept="3I6sU6" id="2YqrT$P7S7_" role="3Ip0Jz">
+          <node concept="3I6s7M" id="2YqrT$P7Sr7" role="3I6sU7">
+            <node concept="3Aqt3T" id="2YqrT$P7Sr6" role="3I6s78">
+              <ref role="3AqCNq" to="f3ld:2YqrT$P7tud" resolve="valid" />
+              <node concept="3BlFb$" id="9AXE3xOzaf" role="3AunhB">
+                <node concept="3A2sRY" id="9AXE3xOzat" role="3BlFb_">
+                  <ref role="3A2yKK" node="2YqrT$P7I4k" resolve="goal" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="3AqmO8" id="2aBGSFgfwNi" role="8PkJo">
+      <property role="TrG5h" value="conclusion" />
+      <node concept="1zAUYm" id="2aBGSFgfwNl" role="1zAUyy">
+        <property role="TrG5h" value="stc" />
+      </node>
+      <node concept="1zAUYm" id="2aBGSFgfwNn" role="1zAUyy">
+        <property role="TrG5h" value="rsn" />
+      </node>
+      <node concept="1zAsnw" id="3l440nVsJk$" role="lGtFl">
+        <node concept="3SKdUq" id="3l440nVsJk_" role="27qylF">
+          <property role="3SKdUp" value="sentence is the reasoning's conclusion" />
+        </node>
+      </node>
+    </node>
+    <node concept="3AqmO8" id="2YqrT$P7RE$" role="8PkJo">
+      <property role="TrG5h" value="goal" />
+      <node concept="1zAUYm" id="2YqrT$P7REF" role="1zAUyy">
+        <property role="TrG5h" value="stc" />
+      </node>
+      <node concept="1zAUYm" id="2YqrT$P7REH" role="1zAUyy">
+        <property role="TrG5h" value="goal" />
+      </node>
+      <node concept="1zAsnw" id="3l440nVsJkI" role="lGtFl">
+        <node concept="3SKdUq" id="3l440nVsJkJ" role="27qylF">
+          <property role="3SKdUp" value="sentence is the proof's goal" />
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+