diff --git a/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.samplechecker.runner/models/jetbrains/mps/lang/typesystem2/samplechecker/runner.mps b/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.samplechecker.runner/models/jetbrains/mps/lang/typesystem2/samplechecker/runner.mps
index 9aa64630..7ed3486c 100644
--- a/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.samplechecker.runner/models/jetbrains/mps/lang/typesystem2/samplechecker/runner.mps
+++ b/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.samplechecker.runner/models/jetbrains/mps/lang/typesystem2/samplechecker/runner.mps
@@ -22,6 +22,7 @@
     <import index="xq5w" ref="r:729bada4-05fa-458f-8bf8-28b9cb978726(jetbrains.mps.logic.builtin.var)" />
     <import index="45ys" ref="r:7365f7fe-12e6-4229-8901-f6dc6d5df03f(jetbrains.mps.logic.reactor.logical)" />
     <import index="qrld" ref="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)" />
+    <import index="rchb" ref="r:f43ee4a0-488a-425a-87a0-594ab3b0d15f(jetbrains.mps.logic.reactor.program)" />
   </imports>
   <registry>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
@@ -59,15 +60,11 @@
       </concept>
       <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
         <child id="1154032183016" name="body" index="2LFqv$" />
-        <child id="363746191845183793" name="loopLabel" index="3Wmhwa" />
       </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
       </concept>
-      <concept id="1197029447546" name="jetbrains.mps.baseLanguage.structure.FieldReferenceOperation" flags="nn" index="2OwXpG">
-        <reference id="1197029500499" name="fieldDeclaration" index="2Oxat5" />
-      </concept>
       <concept id="1164879751025" name="jetbrains.mps.baseLanguage.structure.TryCatchStatement" flags="nn" index="SfApY">
         <child id="1164879758292" name="body" index="SfCbr" />
         <child id="1164903496223" name="catchClause" index="TEbGg" />
@@ -79,7 +76,10 @@
         <child id="1164903359218" name="catchBody" index="TDEfX" />
         <child id="1164903359217" name="throwable" index="TDEfY" />
       </concept>
-      <concept id="1070475354124" name="jetbrains.mps.baseLanguage.structure.ThisExpression" flags="nn" index="Xjq3P" />
+      <concept id="1070462154015" name="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" flags="ig" index="Wx3nA">
+        <property id="6468716278899126575" name="isVolatile" index="2dlcS1" />
+        <property id="6468716278899125786" name="isTransient" index="2dld4O" />
+      </concept>
       <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" />
@@ -91,9 +91,6 @@
       <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="1081256982272" name="jetbrains.mps.baseLanguage.structure.InstanceOfExpression" flags="nn" index="2ZW3vV">
         <child id="1081256993305" name="classType" index="2ZW6by" />
         <child id="1081256993304" name="leftExpression" index="2ZW6bz" />
@@ -103,7 +100,6 @@
       </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="1070534760951" name="jetbrains.mps.baseLanguage.structure.ArrayType" flags="in" index="10Q1$e">
         <child id="1070534760952" name="componentType" index="10Q1$1" />
       </concept>
@@ -111,11 +107,11 @@
         <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="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
         <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" />
         <child id="1068431790190" name="initializer" index="33vP2m" />
       </concept>
       <concept id="1068498886296" name="jetbrains.mps.baseLanguage.structure.VariableReference" flags="nn" index="37vLTw">
@@ -130,7 +126,6 @@
       <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="1164879685961" name="throwsItem" index="Sfmx6" />
         <child id="1068580123133" name="returnType" index="3clF45" />
         <child id="1068580123134" name="parameter" index="3clF46" />
         <child id="1068580123135" name="body" index="3clF47" />
@@ -152,9 +147,6 @@
       <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="1068580123137" name="jetbrains.mps.baseLanguage.structure.BooleanConstant" flags="nn" index="3clFbT">
-        <property id="1068580123138" name="value" index="3clFbU" />
-      </concept>
       <concept id="1068580123140" name="jetbrains.mps.baseLanguage.structure.ConstructorDeclaration" flags="ig" index="3clFbW" />
       <concept id="1068580320020" name="jetbrains.mps.baseLanguage.structure.IntegerConstant" flags="nn" index="3cmrfG">
         <property id="1068580320021" name="value" index="3cmrfH" />
@@ -176,6 +168,10 @@
         <child id="1079359253376" name="expression" index="1eOMHV" />
       </concept>
       <concept id="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
+      <concept id="1154542696413" name="jetbrains.mps.baseLanguage.structure.ArrayCreatorWithInitializer" flags="nn" index="3g6Rrh">
+        <child id="1154542793668" name="componentType" index="3g7fb8" />
+        <child id="1154542803372" name="initValue" index="3g7hyw" />
+      </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" />
@@ -198,16 +194,6 @@
       </concept>
       <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
       <concept id="1073239437375" name="jetbrains.mps.baseLanguage.structure.NotEqualsExpression" flags="nn" index="3y3z36" />
-      <concept id="1081855346303" name="jetbrains.mps.baseLanguage.structure.BreakStatement" flags="nn" index="3zACq4">
-        <child id="9056323058805176516" name="loopLabelReference" index="2mV7Oi" />
-      </concept>
-      <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>
@@ -226,25 +212,9 @@
         <child id="1163668922816" name="ifTrue" index="3K4E3e" />
         <child id="1163668934364" name="ifFalse" index="3K4GZi" />
       </concept>
-      <concept id="1082113931046" name="jetbrains.mps.baseLanguage.structure.ContinueStatement" flags="nn" index="3N13vt">
-        <child id="9056323058805226429" name="loopLabelReference" index="2mVjTF" />
-      </concept>
       <concept id="1208890769693" name="jetbrains.mps.baseLanguage.structure.ArrayLengthOperation" flags="nn" index="1Rwk04" />
-      <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" />
-      <concept id="1116615150612" name="jetbrains.mps.baseLanguage.structure.ClassifierClassExpression" flags="nn" index="3VsKOn">
-        <reference id="1116615189566" name="classifier" index="3VsUkX" />
-      </concept>
-      <concept id="363746191845183785" name="jetbrains.mps.baseLanguage.structure.LoopLabelReference" flags="ng" index="3Wmhwi">
-        <reference id="363746191845183786" name="loopLabel" index="3Wmhwh" />
-      </concept>
-      <concept id="363746191845175146" name="jetbrains.mps.baseLanguage.structure.LoopLabel" flags="ng" index="3Wmmph" />
       <concept id="1170345865475" name="jetbrains.mps.baseLanguage.structure.AnonymousClass" flags="ig" index="1Y3b0j">
         <reference id="1170346070688" name="classifier" index="1Y3XeK" />
       </concept>
@@ -275,10 +245,45 @@
   </registry>
   <node concept="312cEu" id="3Qp4N06bZn0">
     <property role="TrG5h" value="TestHandlerRunner" />
-    <node concept="312cEg" id="41ox5VnjK7R" role="jymVt">
-      <property role="TrG5h" value="withTracer" />
-      <node concept="3Tm6S6" id="41ox5VnjK7P" role="1B3o_S" />
-      <node concept="10P_77" id="41ox5VnjK7Q" role="1tU5fm" />
+    <node concept="2tJIrI" id="5mr7UHcdsSH" role="jymVt" />
+    <node concept="Wx3nA" id="5mr7UHcbnci" role="jymVt">
+      <property role="2dlcS1" value="false" />
+      <property role="2dld4O" value="false" />
+      <property role="TrG5h" value="PREDICATE_SYMBOLS" />
+      <property role="3TUv4t" value="true" />
+      <node concept="3Tm1VV" id="5mr7UHcbl_B" role="1B3o_S" />
+      <node concept="10Q1$e" id="5mr7UHcbnc4" role="1tU5fm">
+        <node concept="3uibUv" id="5mr7UHcbq0Z" role="10Q1$1">
+          <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+        </node>
+      </node>
+      <node concept="2ShNRf" id="5mr7UHcbowK" role="33vP2m">
+        <node concept="3g6Rrh" id="5mr7UHcboy8" role="2ShVmc">
+          <node concept="10M0yZ" id="5mr7UHcboyR" role="3g7hyw">
+            <ref role="1PxDUh" to="oy3s:2GO7tyJVmP4" resolve="UnificationBuiltinConstraint" />
+            <ref role="3cqZAo" to="oy3s:5uFPQ7C29mw" resolve="UNI_SYM" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboyX" role="3g7hyw">
+            <ref role="1PxDUh" to="oy3s:3HJTsBn4kk_" resolve="EqualsBuiltinConstraint" />
+            <ref role="3cqZAo" to="oy3s:5uFPQ7C23RV" resolve="EQ_SYM" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboz3" role="3g7hyw">
+            <ref role="3cqZAo" to="oy3s:5uFPQ7BZnLB" resolve="ASSERT_SYM" />
+            <ref role="1PxDUh" to="oy3s:6infEALAfer" resolve="AssertBuiltinConstraint" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboz9" role="3g7hyw">
+            <ref role="3cqZAo" to="xq5w:5uFPQ7C26$b" resolve="BOUND_SYM" />
+            <ref role="1PxDUh" to="xq5w:5$WbtTOYoMb" resolve="LogicalBuiltinConstraint" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcbozf" role="3g7hyw">
+            <ref role="3cqZAo" to="xq5w:5uFPQ7C279$" resolve="FREE_SYM" />
+            <ref role="1PxDUh" to="xq5w:5$WbtTOYoMb" resolve="LogicalBuiltinConstraint" />
+          </node>
+          <node concept="3uibUv" id="5mr7UHcbqo2" role="3g7fb8">
+            <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+          </node>
+        </node>
+      </node>
     </node>
     <node concept="2tJIrI" id="3Qp4N06bZn1" role="jymVt" />
     <node concept="2YIFZL" id="3Qp4N06bZn2" role="jymVt">
@@ -435,55 +440,45 @@
           </node>
         </node>
         <node concept="3clFbH" id="41ox5VneBkr" role="3cqZAp" />
-        <node concept="3cpWs8" id="41ox5Vnk0DN" role="3cqZAp">
-          <node concept="3cpWsn" id="41ox5Vnk0DO" role="3cpWs9">
-            <property role="TrG5h" value="runner" />
-            <node concept="3uibUv" id="41ox5Vnk0DK" role="1tU5fm">
-              <ref role="3uigEE" node="3Qp4N06bZn0" resolve="TestHandlerRunner" />
+        <node concept="3cpWs8" id="5mr7UHcbsDR" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcbsDS" role="3cpWs9">
+            <property role="TrG5h" value="evaluationSession" />
+            <node concept="3uibUv" id="5mr7UHcbsDe" role="1tU5fm">
+              <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
             </node>
-            <node concept="2ShNRf" id="41ox5Vnk0DP" role="33vP2m">
-              <node concept="1pGfFk" id="41ox5Vnk0DQ" role="2ShVmc">
-                <ref role="37wK5l" node="41ox5VnjUqi" resolve="TestHandlerRunner" />
-                <node concept="3clFbT" id="41ox5Vnk0DR" role="37wK5m">
-                  <property role="3clFbU" value="true" />
+            <node concept="2OqwBi" id="5mr7UHcbsDT" role="33vP2m">
+              <node concept="2OqwBi" id="5mr7UHcbsDV" role="2Oq$k0">
+                <node concept="2OqwBi" id="5mr7UHcbsDW" role="2Oq$k0">
+                  <node concept="2YIFZM" id="5mr7UHcbsDX" role="2Oq$k0">
+                    <ref role="37wK5l" to="rchb:7ISVfSIwfH" resolve="newSession" />
+                    <ref role="1Pybhc" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
+                  </node>
+                  <node concept="liA8E" id="5mr7UHcbsDY" role="2OqNvi">
+                    <ref role="37wK5l" to="rchb:5mr7UHcbbR2" resolve="withParam" />
+                    <node concept="Xl_RD" id="5mr7UHcbsDZ" role="37wK5m">
+                      <property role="Xl_RC" value="jchr.handler.class" />
+                    </node>
+                    <node concept="37vLTw" id="5mr7UHcbsE0" role="37wK5m">
+                      <ref role="3cqZAo" node="41ox5VnfMiq" resolve="handlerCls" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="liA8E" id="5mr7UHcbsE1" role="2OqNvi">
+                  <ref role="37wK5l" to="rchb:5uFPQ7Bwu9Q" resolve="withPredicates" />
+                  <node concept="37vLTw" id="5mr7UHcdeDp" role="37wK5m">
+                    <ref role="3cqZAo" node="5mr7UHcbnci" resolve="PREDICATE_SYMBOLS" />
+                  </node>
                 </node>
               </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3cpWs8" id="41ox5VneHGC" role="3cqZAp">
-          <node concept="3cpWsn" id="41ox5VneHGD" role="3cpWs9">
-            <property role="TrG5h" value="handler" />
-            <node concept="3uibUv" id="41ox5VneHGy" role="1tU5fm">
-              <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
-            </node>
-            <node concept="2OqwBi" id="41ox5Vnk1fN" role="33vP2m">
-              <node concept="37vLTw" id="41ox5Vnk1cD" role="2Oq$k0">
-                <ref role="3cqZAo" node="41ox5Vnk0DO" resolve="runner" />
-              </node>
-              <node concept="liA8E" id="41ox5Vnk1nr" role="2OqNvi">
-                <ref role="37wK5l" node="41ox5VnjMnq" resolve="runChecks" />
-                <node concept="37vLTw" id="41ox5VnikfZ" role="37wK5m">
-                  <ref role="3cqZAo" node="41ox5VnfMiq" resolve="handlerCls" />
-                </node>
+              <node concept="liA8E" id="5mr7UHcbsE5" role="2OqNvi">
+                <ref role="37wK5l" to="rchb:7ISVfSIuSh" resolve="start" />
               </node>
             </node>
           </node>
         </node>
-        <node concept="3clFbJ" id="41ox5VnfaPd" role="3cqZAp">
-          <node concept="3clFbS" id="41ox5VnfaPf" role="3clFbx">
-            <node concept="3cpWs6" id="41ox5VnfcsR" role="3cqZAp" />
-          </node>
-          <node concept="3clFbC" id="41ox5Vnfcjg" role="3clFbw">
-            <node concept="10Nm6u" id="41ox5Vnfcmn" role="3uHU7w" />
-            <node concept="37vLTw" id="41ox5Vnfc1H" role="3uHU7B">
-              <ref role="3cqZAo" node="41ox5VneHGD" resolve="handler" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbH" id="3Qp4N06bZn_" role="3cqZAp" />
-        <node concept="1Dw8fO" id="1xCHoaHsSc$" role="3cqZAp">
-          <node concept="3clFbS" id="1xCHoaHsScB" role="2LFqv$">
+        <node concept="3clFbH" id="5mr7UHcddlb" role="3cqZAp" />
+        <node concept="1DcWWT" id="5mr7UHcdjPL" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHcdjPN" role="2LFqv$">
             <node concept="3clFbF" id="3Qp4N06bZo4" role="3cqZAp">
               <node concept="2OqwBi" id="3Qp4N06bZo5" role="3clFbG">
                 <node concept="10M0yZ" id="3Qp4N06bZo6" role="2Oq$k0">
@@ -495,52 +490,26 @@
                   <node concept="2YIFZM" id="1H8E3iB4$z4" role="37wK5m">
                     <ref role="1Pybhc" node="3Qp4N06bZn0" resolve="TestHandlerRunner" />
                     <ref role="37wK5l" node="1H8E3iB4zRw" resolve="toText" />
-                    <node concept="2OqwBi" id="1xCHoaHsVKq" role="37wK5m">
-                      <node concept="37vLTw" id="1xCHoaHsVFU" role="2Oq$k0">
-                        <ref role="3cqZAo" node="1xCHoaHsScE" resolve="cit" />
-                      </node>
-                      <node concept="liA8E" id="1xCHoaHsW1g" role="2OqNvi">
-                        <ref role="37wK5l" to="33ny:~Iterator.next():java.lang.Object" resolve="next" />
-                      </node>
+                    <node concept="37vLTw" id="5mr7UHcdlET" role="37wK5m">
+                      <ref role="3cqZAo" node="5mr7UHcdjPO" resolve="co" />
                     </node>
                   </node>
                 </node>
               </node>
             </node>
           </node>
-          <node concept="3cpWsn" id="1xCHoaHsScE" role="1Duv9x">
-            <property role="TrG5h" value="cit" />
-            <node concept="3uibUv" id="1xCHoaHsSzR" role="1tU5fm">
-              <ref role="3uigEE" to="33ny:~Iterator" resolve="Iterator" />
-              <node concept="3uibUv" id="1xCHoaHsTh1" role="11_B2D">
-                <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
-              </node>
-            </node>
-            <node concept="2OqwBi" id="1xCHoaHsTn9" role="33vP2m">
-              <node concept="1eOMI4" id="1xCHoaHsTna" role="2Oq$k0">
-                <node concept="10QFUN" id="1xCHoaHsTnb" role="1eOMHV">
-                  <node concept="37vLTw" id="1xCHoaHsTnc" role="10QFUP">
-                    <ref role="3cqZAo" node="41ox5VneHGD" resolve="handler" />
-                  </node>
-                  <node concept="3uibUv" id="1xCHoaHsTnd" role="10QFUM">
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-      <node concept="3Tm6S6" id="41ox5VndXtW" role="1B3o_S" />
-    </node>
-    <node concept="2tJIrI" id="3Qp4N06bZoq" role="jymVt" />
     <node concept="2YIFZL" id="41ox5VnjQJx" role="jymVt">
       <property role="TrG5h" value="attachTracerTo" />
       <property role="IEkAT" value="false" />
@@ -1400,9 +676,9 @@
       <node concept="3Tm6S6" id="1H8E3iB4zRx" role="1B3o_S" />
       <node concept="17QB3L" id="1H8E3iB4zRy" role="3clF45" />
       <node concept="37vLTG" id="1H8E3iB4zRr" role="3clF46">
-        <property role="TrG5h" value="cst" />
-        <node concept="3uibUv" id="1H8E3iB4zRs" role="1tU5fm">
-          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        <property role="TrG5h" value="cocc" />
+        <node concept="3uibUv" id="5mr7UHcdeYc" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
       <node concept="3clFbS" id="1H8E3iB4zQI" role="3clF47">
@@ -1426,13 +702,18 @@
                 <ref role="3cqZAo" node="104EUzFgB$8" resolve="sb" />
               </node>
               <node concept="liA8E" id="104EUzFgDNZ" role="2OqNvi">
-                <ref role="37wK5l" to="wyt6:~StringBuilder.append(java.lang.String):java.lang.StringBuilder" resolve="append" />
-                <node concept="2OqwBi" id="104EUzFgG$Q" role="37wK5m">
-                  <node concept="37vLTw" id="104EUzFgG$R" role="2Oq$k0">
-                    <ref role="3cqZAo" node="1H8E3iB4zRr" resolve="cst" />
+                <ref role="37wK5l" to="wyt6:~StringBuilder.append(java.lang.Object):java.lang.StringBuilder" resolve="append" />
+                <node concept="2OqwBi" id="5mr7UHcdf$K" role="37wK5m">
+                  <node concept="2OqwBi" id="104EUzFgG$Q" role="2Oq$k0">
+                    <node concept="37vLTw" id="104EUzFgG$R" role="2Oq$k0">
+                      <ref role="3cqZAo" node="1H8E3iB4zRr" resolve="cocc" />
+                    </node>
+                    <node concept="liA8E" id="5mr7UHcdfz7" role="2OqNvi">
+                      <ref role="37wK5l" to="qrld:5uFPQ7BZacZ" resolve="constraint" />
+                    </node>
                   </node>
-                  <node concept="liA8E" id="104EUzFgG$S" role="2OqNvi">
-                    <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                  <node concept="liA8E" id="5mr7UHcdfCa" role="2OqNvi">
+                    <ref role="37wK5l" to="qrld:5uFPQ7B_aTC" resolve="symbol" />
                   </node>
                 </node>
               </node>
@@ -1446,20 +727,21 @@
           </node>
         </node>
         <node concept="3clFbH" id="104EUzFgAyR" role="3cqZAp" />
-        <node concept="3cpWs8" id="1H8E3iB4zQL" role="3cqZAp">
-          <node concept="3cpWsn" id="1H8E3iB4zQM" role="3cpWs9">
+        <node concept="3cpWs8" id="5mr7UHcdg1H" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcdg1I" role="3cpWs9">
             <property role="TrG5h" value="args" />
-            <node concept="10Q1$e" id="1H8E3iB4zQN" role="1tU5fm">
-              <node concept="3uibUv" id="1H8E3iB4zQO" role="10Q1$1">
+            <node concept="3uibUv" id="5mr7UHcdg1D" role="1tU5fm">
+              <ref role="3uigEE" to="33ny:~List" resolve="List" />
+              <node concept="3uibUv" id="5mr7UHcdg1G" role="11_B2D">
                 <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
               </node>
             </node>
-            <node concept="2OqwBi" id="1H8E3iB4zQP" role="33vP2m">
-              <node concept="37vLTw" id="1H8E3iB4zRt" role="2Oq$k0">
-                <ref role="3cqZAo" node="1H8E3iB4zRr" resolve="cst" />
+            <node concept="2OqwBi" id="5mr7UHcdg1J" role="33vP2m">
+              <node concept="37vLTw" id="5mr7UHcdg1K" role="2Oq$k0">
+                <ref role="3cqZAo" node="1H8E3iB4zRr" resolve="cocc" />
               </node>
-              <node concept="liA8E" id="1H8E3iB4zQR" role="2OqNvi">
-                <ref role="37wK5l" to="eifs:~IConstraint.getArguments():java.lang.Object[]" resolve="getArguments" />
+              <node concept="liA8E" id="5mr7UHcdg1L" role="2OqNvi">
+                <ref role="37wK5l" to="qrld:5uFPQ7BZafw" resolve="arguments" />
               </node>
             </node>
           </node>
@@ -1488,12 +770,15 @@
                 <node concept="3uibUv" id="4ef1vBgAG$f" role="1tU5fm">
                   <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
                 </node>
-                <node concept="AH0OO" id="4ef1vBgAG$r" role="33vP2m">
-                  <node concept="37vLTw" id="4ef1vBgAG$s" role="AHEQo">
-                    <ref role="3cqZAo" node="104EUzFgKl9" resolve="i" />
+                <node concept="2OqwBi" id="5mr7UHcdhkF" role="33vP2m">
+                  <node concept="37vLTw" id="5mr7UHcdgXc" role="2Oq$k0">
+                    <ref role="3cqZAo" node="5mr7UHcdg1I" resolve="args" />
                   </node>
-                  <node concept="37vLTw" id="4ef1vBgAG$t" role="AHHXb">
-                    <ref role="3cqZAo" node="1H8E3iB4zQM" resolve="args" />
+                  <node concept="liA8E" id="5mr7UHcdhye" role="2OqNvi">
+                    <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                    <node concept="37vLTw" id="5mr7UHcdhGQ" role="37wK5m">
+                      <ref role="3cqZAo" node="104EUzFgKl9" resolve="i" />
+                    </node>
                   </node>
                 </node>
               </node>
@@ -1862,10 +1147,12 @@
           </node>
           <node concept="3eOVzh" id="104EUzFgLnU" role="1Dwp0S">
             <node concept="2OqwBi" id="104EUzFgLBt" role="3uHU7w">
-              <node concept="37vLTw" id="104EUzFgLux" role="2Oq$k0">
-                <ref role="3cqZAo" node="1H8E3iB4zQM" resolve="args" />
+              <node concept="37vLTw" id="5mr7UHcdgNh" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHcdg1I" resolve="args" />
+              </node>
+              <node concept="liA8E" id="5mr7UHcdgTD" role="2OqNvi">
+                <ref role="37wK5l" to="33ny:~List.size():int" resolve="size" />
               </node>
-              <node concept="1Rwk04" id="104EUzFgLSb" role="2OqNvi" />
             </node>
             <node concept="37vLTw" id="104EUzFgKWl" role="3uHU7B">
               <ref role="3cqZAo" node="104EUzFgKl9" resolve="i" />
diff --git a/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.sampleplugin/models/jetbrains/mps/lang/typesystem2/sampleplugin/plugin.mps b/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.sampleplugin/models/jetbrains/mps/lang/typesystem2/sampleplugin/plugin.mps
index 6e9997fc..a2c3ef3c 100644
--- a/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.sampleplugin/models/jetbrains/mps/lang/typesystem2/sampleplugin/plugin.mps
+++ b/languages/jetbrains.mps.lang.typesystem2/sandbox/jetbrains.mps.lang.typesystem2.sampleplugin/models/jetbrains/mps/lang/typesystem2/sampleplugin/plugin.mps
@@ -68,6 +68,7 @@
     <import index="qrld" ref="r:2a79c8aa-e372-4c00-8d71-5d7f3db517e4(jetbrains.mps.logic.reactor.constraint)" />
     <import index="i8dg" ref="r:e8529b97-a186-4c32-8f12-771b2a92b55a(jetbrains.mps.logic.reactor.rule)" />
     <import index="95zw" ref="r:f3ff7852-b9dd-4760-b213-a8a031c77d0e(jetbrains.mps.logic.jchr.predicate)" />
+    <import index="rchb" ref="r:f43ee4a0-488a-425a-87a0-594ab3b0d15f(jetbrains.mps.logic.reactor.program)" />
     <import index="tprs" ref="r:00000000-0000-4000-0000-011c895904a4(jetbrains.mps.ide.actions)" implicit="true" />
   </imports>
   <registry>
@@ -122,7 +123,6 @@
       <concept id="7520713872864775836" name="jetbrains.mps.lang.plugin.standalone.structure.StandalonePluginDescriptor" flags="ng" index="2DaZZR" />
     </language>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
-      <concept id="1080223426719" name="jetbrains.mps.baseLanguage.structure.OrExpression" flags="nn" index="22lmx$" />
       <concept id="1219920932475" name="jetbrains.mps.baseLanguage.structure.VariableArityType" flags="in" index="8X2XB">
         <child id="1219921048460" name="componentType" index="8Xvag" />
       </concept>
@@ -143,10 +143,6 @@
       <concept id="1239714755177" name="jetbrains.mps.baseLanguage.structure.AbstractUnaryNumberOperation" flags="nn" index="2$Kvd9">
         <child id="1239714902950" name="expression" index="2$L3a6" />
       </concept>
-      <concept id="1173175405605" name="jetbrains.mps.baseLanguage.structure.ArrayAccessExpression" flags="nn" index="AH0OO">
-        <child id="1173175577737" name="index" index="AHEQo" />
-        <child id="1173175590490" name="array" index="AHHXb" />
-      </concept>
       <concept id="1188207840427" name="jetbrains.mps.baseLanguage.structure.AnnotationInstance" flags="nn" index="2AHcQZ">
         <reference id="1188208074048" name="annotation" index="2AI5Lk" />
       </concept>
@@ -169,7 +165,6 @@
       </concept>
       <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
         <child id="1154032183016" name="body" index="2LFqv$" />
-        <child id="363746191845183793" name="loopLabel" index="3Wmhwa" />
       </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
@@ -200,7 +195,10 @@
       <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
         <child id="1137022507850" name="body" index="2VODD2" />
       </concept>
-      <concept id="1070462154015" name="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" flags="ig" index="Wx3nA" />
+      <concept id="1070462154015" name="jetbrains.mps.baseLanguage.structure.StaticFieldDeclaration" flags="ig" index="Wx3nA">
+        <property id="6468716278899126575" name="isVolatile" index="2dlcS1" />
+        <property id="6468716278899125786" name="isTransient" index="2dld4O" />
+      </concept>
       <concept id="1070475354124" name="jetbrains.mps.baseLanguage.structure.ThisExpression" flags="nn" index="Xjq3P">
         <reference id="1182955020723" name="classConcept" index="1HBi2w" />
       </concept>
@@ -273,7 +271,6 @@
       <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="1164879685961" name="throwsItem" index="Sfmx6" />
         <child id="1068580123133" name="returnType" index="3clF45" />
         <child id="1068580123134" name="parameter" index="3clF46" />
         <child id="1068580123135" name="body" index="3clF47" />
@@ -316,10 +313,13 @@
         <child id="1079359253376" name="expression" index="1eOMHV" />
       </concept>
       <concept id="1081506762703" name="jetbrains.mps.baseLanguage.structure.GreaterThanExpression" flags="nn" index="3eOSWO" />
-      <concept id="1081506773034" name="jetbrains.mps.baseLanguage.structure.LessThanExpression" flags="nn" index="3eOVzh" />
       <concept id="1081516740877" name="jetbrains.mps.baseLanguage.structure.NotExpression" flags="nn" index="3fqX7Q">
         <child id="1081516765348" name="expression" index="3fr31v" />
       </concept>
+      <concept id="1154542696413" name="jetbrains.mps.baseLanguage.structure.ArrayCreatorWithInitializer" flags="nn" index="3g6Rrh">
+        <child id="1154542793668" name="componentType" index="3g7fb8" />
+        <child id="1154542803372" name="initValue" index="3g7hyw" />
+      </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" />
@@ -343,16 +343,6 @@
       </concept>
       <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
       <concept id="1073239437375" name="jetbrains.mps.baseLanguage.structure.NotEqualsExpression" flags="nn" index="3y3z36" />
-      <concept id="1081855346303" name="jetbrains.mps.baseLanguage.structure.BreakStatement" flags="nn" index="3zACq4">
-        <child id="9056323058805176516" name="loopLabelReference" index="2mV7Oi" />
-      </concept>
-      <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>
@@ -362,19 +352,12 @@
       <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="1163668896201" name="jetbrains.mps.baseLanguage.structure.TernaryOperatorExpression" flags="nn" index="3K4zz7">
         <child id="1163668914799" name="condition" index="3K4Cdx" />
         <child id="1163668922816" name="ifTrue" index="3K4E3e" />
         <child id="1163668934364" name="ifFalse" index="3K4GZi" />
       </concept>
-      <concept id="1082113931046" name="jetbrains.mps.baseLanguage.structure.ContinueStatement" flags="nn" index="3N13vt">
-        <child id="9056323058805226429" name="loopLabelReference" index="2mVjTF" />
-      </concept>
-      <concept id="1208890769693" name="jetbrains.mps.baseLanguage.structure.ArrayLengthOperation" flags="nn" index="1Rwk04" />
+      <concept id="1082113931046" name="jetbrains.mps.baseLanguage.structure.ContinueStatement" flags="nn" index="3N13vt" />
       <concept id="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
         <property id="6329021646629104958" name="text" index="3SKdUp" />
       </concept>
@@ -388,10 +371,6 @@
         <reference id="1116615189566" name="classifier" index="3VsUkX" />
       </concept>
       <concept id="1080120340718" name="jetbrains.mps.baseLanguage.structure.AndExpression" flags="nn" index="1Wc70l" />
-      <concept id="363746191845183785" name="jetbrains.mps.baseLanguage.structure.LoopLabelReference" flags="ng" index="3Wmhwi">
-        <reference id="363746191845183786" name="loopLabel" index="3Wmhwh" />
-      </concept>
-      <concept id="363746191845175146" name="jetbrains.mps.baseLanguage.structure.LoopLabel" flags="ng" index="3Wmmph" />
       <concept id="1170345865475" name="jetbrains.mps.baseLanguage.structure.AnonymousClass" flags="ig" index="1Y3b0j">
         <reference id="1170346070688" name="classifier" index="1Y3XeK" />
       </concept>
@@ -1775,6 +1754,46 @@
   <node concept="312cEu" id="41ox5Vnk76a">
     <property role="TrG5h" value="RunTypecheckingRules" />
     <node concept="2tJIrI" id="7dgRGU4ocQV" role="jymVt" />
+    <node concept="Wx3nA" id="5mr7UHcbnci" role="jymVt">
+      <property role="2dlcS1" value="false" />
+      <property role="2dld4O" value="false" />
+      <property role="TrG5h" value="PREDICATE_SYMBOLS" />
+      <property role="3TUv4t" value="true" />
+      <node concept="3Tm1VV" id="5mr7UHcbl_B" role="1B3o_S" />
+      <node concept="10Q1$e" id="5mr7UHcbnc4" role="1tU5fm">
+        <node concept="3uibUv" id="5mr7UHcbq0Z" role="10Q1$1">
+          <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+        </node>
+      </node>
+      <node concept="2ShNRf" id="5mr7UHcbowK" role="33vP2m">
+        <node concept="3g6Rrh" id="5mr7UHcboy8" role="2ShVmc">
+          <node concept="10M0yZ" id="5mr7UHcboyR" role="3g7hyw">
+            <ref role="3cqZAo" to="oy3s:5uFPQ7C29mw" resolve="UNI_SYM" />
+            <ref role="1PxDUh" to="oy3s:2GO7tyJVmP4" resolve="UnificationBuiltinConstraint" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboyX" role="3g7hyw">
+            <ref role="3cqZAo" to="oy3s:5uFPQ7C23RV" resolve="EQ_SYM" />
+            <ref role="1PxDUh" to="oy3s:3HJTsBn4kk_" resolve="EqualsBuiltinConstraint" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboz3" role="3g7hyw">
+            <ref role="1PxDUh" to="oy3s:6infEALAfer" resolve="AssertBuiltinConstraint" />
+            <ref role="3cqZAo" to="oy3s:5uFPQ7BZnLB" resolve="ASSERT_SYM" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcboz9" role="3g7hyw">
+            <ref role="1PxDUh" to="xq5w:5$WbtTOYoMb" resolve="LogicalBuiltinConstraint" />
+            <ref role="3cqZAo" to="xq5w:5uFPQ7C26$b" resolve="BOUND_SYM" />
+          </node>
+          <node concept="10M0yZ" id="5mr7UHcbozf" role="3g7hyw">
+            <ref role="1PxDUh" to="xq5w:5$WbtTOYoMb" resolve="LogicalBuiltinConstraint" />
+            <ref role="3cqZAo" to="xq5w:5uFPQ7C279$" resolve="FREE_SYM" />
+          </node>
+          <node concept="3uibUv" id="5mr7UHcbqo2" role="3g7fb8">
+            <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5mr7UHcbkql" role="jymVt" />
     <node concept="2YIFZL" id="7dgRGU4oCXw" role="jymVt">
       <property role="TrG5h" value="remainingAllowed" />
       <property role="IEkAT" value="false" />
@@ -1930,22 +1949,6 @@
             </node>
           </node>
         </node>
-        <node concept="3clFbH" id="41ox5VnkhLD" role="3cqZAp" />
-        <node concept="3cpWs8" id="41ox5VnkhLE" role="3cqZAp">
-          <node concept="3cpWsn" id="41ox5VnkhLF" role="3cpWs9">
-            <property role="TrG5h" value="sample" />
-            <node concept="3uibUv" id="41ox5VnkhLG" role="1tU5fm">
-              <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
-            </node>
-            <node concept="2YIFZM" id="1zN1RIkMMBr" role="33vP2m">
-              <ref role="37wK5l" to="i348:4OKkcnfu_xq" resolve="anchorAtom" />
-              <ref role="1Pybhc" to="i348:4OKkcnfu_xo" resolve="AnchorUtil" />
-              <node concept="37vLTw" id="1zN1RIkMMBs" role="37wK5m">
-                <ref role="3cqZAo" node="1zN1RIkMJJI" resolve="root" />
-              </node>
-            </node>
-          </node>
-        </node>
         <node concept="3cpWs8" id="4boqC9dOcYg" role="3cqZAp">
           <node concept="3cpWsn" id="4boqC9dOcYh" role="3cpWs9">
             <property role="TrG5h" value="name" />
@@ -1963,110 +1966,102 @@
             </node>
           </node>
         </node>
-        <node concept="SfApY" id="41ox5Vnkj0Z" role="3cqZAp">
-          <node concept="3clFbS" id="41ox5Vnkj10" role="SfCbr">
-            <node concept="3cpWs8" id="41ox5Vnki5M" role="3cqZAp">
-              <node concept="3cpWsn" id="41ox5Vnki5N" role="3cpWs9">
-                <property role="TrG5h" value="handlerCls" />
-                <node concept="3uibUv" id="41ox5Vnki5O" role="1tU5fm">
-                  <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
-                  <node concept="3uibUv" id="41ox5Vnl$GR" role="11_B2D">
-                    <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
-                  </node>
-                </node>
-                <node concept="10QFUN" id="41ox5Vnl_aU" role="33vP2m">
-                  <node concept="3uibUv" id="41ox5Vnl_aJ" role="10QFUM">
-                    <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
-                    <node concept="3uibUv" id="41ox5Vnl_aK" role="11_B2D">
-                      <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
-                    </node>
-                  </node>
-                  <node concept="2OqwBi" id="41ox5Vnl_aL" role="10QFUP">
-                    <node concept="1eOMI4" id="41ox5Vnl_aM" role="2Oq$k0">
-                      <node concept="10QFUN" id="41ox5Vnl_aN" role="1eOMHV">
-                        <node concept="37vLTw" id="41ox5Vnl_aO" role="10QFUP">
-                          <ref role="3cqZAo" node="41ox5VnkhLz" resolve="handlerMod" />
-                        </node>
-                        <node concept="3uibUv" id="41ox5Vnl_aP" role="10QFUM">
-                          <ref role="3uigEE" to="j8aq:~ReloadableModuleBase" resolve="ReloadableModuleBase" />
-                        </node>
-                      </node>
-                    </node>
-                    <node concept="liA8E" id="41ox5Vnl_aQ" role="2OqNvi">
-                      <ref role="37wK5l" to="j8aq:~ReloadableModuleBase.getClass(java.lang.String):java.lang.Class" resolve="getClass" />
-                      <node concept="2YIFZM" id="41ox5Vnl_aR" role="37wK5m">
-                        <ref role="37wK5l" to="18ew:~JavaNameUtil.fqClassName(org.jetbrains.mps.openapi.model.SModel,java.lang.String):java.lang.String" resolve="fqClassName" />
-                        <ref role="1Pybhc" to="18ew:~JavaNameUtil" resolve="JavaNameUtil" />
-                        <node concept="37vLTw" id="41ox5Vnl_aS" role="37wK5m">
-                          <ref role="3cqZAo" node="41ox5VnkhLv" resolve="handlerMdl" />
-                        </node>
-                        <node concept="3cpWs3" id="4boqC9dOGeU" role="37wK5m">
-                          <node concept="Xl_RD" id="4boqC9dOGjo" role="3uHU7w">
-                            <property role="Xl_RC" value="Handler" />
-                          </node>
-                          <node concept="3cpWs3" id="4boqC9dOaGS" role="3uHU7B">
-                            <node concept="Xl_RD" id="41ox5Vnl_aT" role="3uHU7B">
-                              <property role="Xl_RC" value="Typechecking" />
-                            </node>
-                            <node concept="37vLTw" id="4boqC9dOdDe" role="3uHU7w">
-                              <ref role="3cqZAo" node="4boqC9dOcYh" resolve="name" />
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                    </node>
-                  </node>
-                </node>
+        <node concept="3clFbH" id="5mr7UHcbMCj" role="3cqZAp" />
+        <node concept="3cpWs8" id="41ox5Vnki5M" role="3cqZAp">
+          <node concept="3cpWsn" id="41ox5Vnki5N" role="3cpWs9">
+            <property role="TrG5h" value="handlerCls" />
+            <node concept="3uibUv" id="41ox5Vnki5O" role="1tU5fm">
+              <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+              <node concept="3uibUv" id="41ox5Vnl$GR" role="11_B2D">
+                <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
               </node>
             </node>
-            <node concept="3clFbH" id="41ox5Vnki5Z" role="3cqZAp" />
-            <node concept="3cpWs8" id="41ox5Vnmwca" role="3cqZAp">
-              <node concept="3cpWsn" id="41ox5Vnmwcb" role="3cpWs9">
-                <property role="TrG5h" value="handler" />
-                <node concept="3uibUv" id="41ox5Vnmwcc" role="1tU5fm">
-                  <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+            <node concept="2YIFZM" id="5mr7UHcbKf3" role="33vP2m">
+              <ref role="1Pybhc" node="41ox5Vnk76a" resolve="RunTypecheckingRules" />
+              <ref role="37wK5l" node="5mr7UHcbKeS" resolve="findHandlerClass" />
+              <node concept="37vLTw" id="5mr7UHcbKf0" role="37wK5m">
+                <ref role="3cqZAo" node="41ox5VnkhLz" resolve="handlerMod" />
+              </node>
+              <node concept="37vLTw" id="5mr7UHcbKf1" role="37wK5m">
+                <ref role="3cqZAo" node="41ox5VnkhLv" resolve="handlerMdl" />
+              </node>
+              <node concept="37vLTw" id="5mr7UHcbKf2" role="37wK5m">
+                <ref role="3cqZAo" node="4boqC9dOcYh" resolve="name" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="41ox5Vnki5Z" role="3cqZAp" />
+        <node concept="3cpWs8" id="5mr7UHcbsDR" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcbsDS" role="3cpWs9">
+            <property role="TrG5h" value="evaluationSession" />
+            <node concept="3uibUv" id="5mr7UHcbsDe" role="1tU5fm">
+              <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
+            </node>
+            <node concept="2OqwBi" id="5mr7UHcbsDT" role="33vP2m">
+              <node concept="2OqwBi" id="5mr7UHcbsDU" role="2Oq$k0">
+                <node concept="2OqwBi" id="5mr7UHcbsDV" role="2Oq$k0">
+                  <node concept="2OqwBi" id="5mr7UHcbsDW" role="2Oq$k0">
+                    <node concept="2YIFZM" id="5mr7UHcbsDX" role="2Oq$k0">
+                      <ref role="37wK5l" to="rchb:7ISVfSIwfH" resolve="newSession" />
+                      <ref role="1Pybhc" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
+                    </node>
+                    <node concept="liA8E" id="5mr7UHcbsDY" role="2OqNvi">
+                      <ref role="37wK5l" to="rchb:5mr7UHcbbR2" resolve="withParam" />
+                      <node concept="Xl_RD" id="5mr7UHcbsDZ" role="37wK5m">
+                        <property role="Xl_RC" value="jchr.handler.class" />
+                      </node>
+                      <node concept="37vLTw" id="5mr7UHcbsE0" role="37wK5m">
+                        <ref role="3cqZAo" node="41ox5Vnki5N" resolve="handlerCls" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="liA8E" id="5mr7UHcbsE1" role="2OqNvi">
+                    <ref role="37wK5l" to="rchb:5uFPQ7Bwu9Q" resolve="withPredicates" />
+                    <node concept="37vLTw" id="5mr7UHcbsE2" role="37wK5m">
+                      <ref role="3cqZAo" node="5mr7UHcbnci" resolve="PREDICATE_SYMBOLS" />
+                    </node>
+                  </node>
                 </node>
-                <node concept="1rXfSq" id="41ox5Vnmwcd" role="33vP2m">
-                  <ref role="37wK5l" node="41ox5Vnkbyp" resolve="callTellCheck" />
-                  <node concept="37vLTw" id="41ox5Vnmwce" role="37wK5m">
-                    <ref role="3cqZAo" node="41ox5Vnki5N" resolve="handlerCls" />
-                  </node>
-                  <node concept="37vLTw" id="4i4XGQZnwa3" role="37wK5m">
-                    <ref role="3cqZAo" node="4i4XGQZnvKs" resolve="tracer" />
-                  </node>
-                  <node concept="37vLTw" id="24Vro6cQL47" role="37wK5m">
+                <node concept="liA8E" id="5mr7UHcbsE3" role="2OqNvi">
+                  <ref role="37wK5l" to="rchb:5uFPQ7Bwvg_" resolve="withTrace" />
+                  <node concept="37vLTw" id="5mr7UHcbsE4" role="37wK5m">
                     <ref role="3cqZAo" node="24Vro6cQKgF" resolve="cstracer" />
                   </node>
-                  <node concept="37vLTw" id="41ox5Vnmwcf" role="37wK5m">
-                    <ref role="3cqZAo" node="41ox5VnkhLF" resolve="sample" />
-                  </node>
                 </node>
               </node>
-            </node>
-            <node concept="3clFbH" id="41ox5VnmKCw" role="3cqZAp" />
-            <node concept="3cpWs8" id="7dgRGU4oEIC" role="3cqZAp">
-              <node concept="3cpWsn" id="7dgRGU4oEID" role="3cpWs9">
-                <property role="TrG5h" value="remainingAllowed" />
-                <node concept="_YKpA" id="7dgRGU4oFv$" role="1tU5fm">
-                  <node concept="17QB3L" id="7dgRGU4oFvA" role="_ZDj9" />
-                </node>
-                <node concept="1rXfSq" id="7dgRGU4oEIE" role="33vP2m">
-                  <ref role="37wK5l" node="7dgRGU4oCXw" resolve="remainingAllowed" />
-                </node>
+              <node concept="liA8E" id="5mr7UHcbsE5" role="2OqNvi">
+                <ref role="37wK5l" to="rchb:7ISVfSIuSh" resolve="start" />
               </node>
             </node>
-            <node concept="3clFbH" id="7dgRGU4oCrm" role="3cqZAp" />
-            <node concept="3cpWs8" id="7dgRGU4oLq0" role="3cqZAp">
-              <node concept="3cpWsn" id="7dgRGU4oLq3" role="3cpWs9">
-                <property role="TrG5h" value="remainingOk" />
-                <node concept="10P_77" id="7dgRGU4oLpY" role="1tU5fm" />
-                <node concept="3clFbT" id="7dgRGU4oLWC" role="33vP2m">
-                  <property role="3clFbU" value="true" />
-                </node>
-              </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="5mr7UHcbqIA" role="3cqZAp" />
+        <node concept="3cpWs8" id="7dgRGU4oEIC" role="3cqZAp">
+          <node concept="3cpWsn" id="7dgRGU4oEID" role="3cpWs9">
+            <property role="TrG5h" value="remainingAllowed" />
+            <node concept="_YKpA" id="7dgRGU4oFv$" role="1tU5fm">
+              <node concept="17QB3L" id="7dgRGU4oFvA" role="_ZDj9" />
             </node>
-            <node concept="1DcWWT" id="7FtwPOZH5ZC" role="3cqZAp">
-              <node concept="3clFbS" id="7FtwPOZH5ZD" role="2LFqv$">
+            <node concept="1rXfSq" id="7dgRGU4oEIE" role="33vP2m">
+              <ref role="37wK5l" node="7dgRGU4oCXw" resolve="remainingAllowed" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="7dgRGU4oCrm" role="3cqZAp" />
+        <node concept="3cpWs8" id="7dgRGU4oLq0" role="3cqZAp">
+          <node concept="3cpWsn" id="7dgRGU4oLq3" role="3cpWs9">
+            <property role="TrG5h" value="remainingOk" />
+            <node concept="10P_77" id="7dgRGU4oLpY" role="1tU5fm" />
+            <node concept="3clFbT" id="7dgRGU4oLWC" role="33vP2m">
+              <property role="3clFbU" value="true" />
+            </node>
+          </node>
+        </node>
+        <node concept="1DcWWT" id="5mr7UHcc5Jm" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHcc5Jo" role="2LFqv$">
+            <node concept="1DcWWT" id="5mr7UHccsMF" role="3cqZAp">
+              <node concept="3clFbS" id="5mr7UHccsMH" role="2LFqv$">
                 <node concept="3clFbJ" id="7dgRGU4oMPa" role="3cqZAp">
                   <node concept="2OqwBi" id="7nkyKX7hbMh" role="3clFbw">
                     <node concept="37vLTw" id="7nkyKX7hbMi" role="2Oq$k0">
@@ -2074,11 +2069,11 @@
                     </node>
                     <node concept="3JPx81" id="7nkyKX7hbMj" role="2OqNvi">
                       <node concept="2OqwBi" id="7nkyKX7hbMk" role="25WWJ7">
-                        <node concept="37vLTw" id="7nkyKX7hbMl" role="2Oq$k0">
-                          <ref role="3cqZAo" node="7FtwPOZH60R" resolve="c" />
+                        <node concept="37vLTw" id="5mr7UHcc7qX" role="2Oq$k0">
+                          <ref role="3cqZAo" node="5mr7UHcc5Jp" resolve="cs" />
                         </node>
                         <node concept="liA8E" id="7nkyKX7hbMm" role="2OqNvi">
-                          <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                          <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
                         </node>
                       </node>
                     </node>
@@ -2091,12 +2086,13 @@
                         </node>
                         <node concept="liA8E" id="7nkyKX7hbcb" role="2OqNvi">
                           <ref role="37wK5l" to="yg8f:7nkyKX7gU0T" resolve="result" />
-                          <node concept="37vLTw" id="7nkyKX7hbl3" role="37wK5m">
-                            <ref role="3cqZAo" node="7FtwPOZH60R" resolve="c" />
+                          <node concept="37vLTw" id="5mr7UHcctZW" role="37wK5m">
+                            <ref role="3cqZAo" node="5mr7UHccsMI" resolve="co" />
                           </node>
                         </node>
                       </node>
                     </node>
+                    <node concept="3clFbH" id="5mr7UHcc7$D" role="3cqZAp" />
                   </node>
                   <node concept="9aQIb" id="7nkyKX7hav2" role="9aQIa">
                     <node concept="3clFbS" id="7dgRGU4oMPc" role="9aQI4">
@@ -2107,93 +2103,105 @@
                           </node>
                           <node concept="liA8E" id="7nkyKX7hbpz" role="2OqNvi">
                             <ref role="37wK5l" to="yg8f:7nkyKX7gU3L" resolve="garbage" />
-                            <node concept="37vLTw" id="7nkyKX7hbp$" role="37wK5m">
-                              <ref role="3cqZAo" node="7FtwPOZH60R" resolve="c" />
+                            <node concept="37vLTw" id="5mr7UHccu7a" role="37wK5m">
+                              <ref role="3cqZAo" node="5mr7UHccsMI" resolve="co" />
                             </node>
                           </node>
                         </node>
                       </node>
+                      <node concept="3clFbF" id="5mr7UHcc9ud" role="3cqZAp">
+                        <node concept="37vLTI" id="5mr7UHcc9Bh" role="3clFbG">
+                          <node concept="3clFbT" id="5mr7UHcc9IC" role="37vLTx">
+                            <property role="3clFbU" value="false" />
+                          </node>
+                          <node concept="37vLTw" id="5mr7UHcc9ub" role="37vLTJ">
+                            <ref role="3cqZAo" node="7dgRGU4oLq3" resolve="remainingOk" />
+                          </node>
+                        </node>
+                      </node>
                     </node>
                   </node>
                 </node>
               </node>
-              <node concept="3cpWsn" id="7FtwPOZH60R" role="1Duv9x">
-                <property role="TrG5h" value="c" />
-                <node concept="3uibUv" id="7FtwPOZH60S" role="1tU5fm">
-                  <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+              <node concept="3cpWsn" id="5mr7UHccsMI" role="1Duv9x">
+                <property role="TrG5h" value="co" />
+                <node concept="3uibUv" id="5mr7UHcct7F" role="1tU5fm">
+                  <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
                 </node>
               </node>
-              <node concept="37vLTw" id="7FtwPOZH60T" role="1DdaDG">
-                <ref role="3cqZAo" node="41ox5Vnmwcb" resolve="handler" />
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-            </node>
-            <node concept="3clFbH" id="1CgWc1Tkrhh" role="3cqZAp" />
-            <node concept="3cpWs8" id="6HT7BWBUcvI" role="3cqZAp">
-              <node concept="3cpWsn" id="6HT7BWBUcvJ" role="3cpWs9">
-                <property role="TrG5h" value="formatter" />
-                <node concept="3uibUv" id="6HT7BWBUcvK" role="1tU5fm">
-                  <ref role="3uigEE" node="6HT7BWBSFOV" resolve="RunTypecheckingRules.TypeFormatter" />
+              <node concept="2OqwBi" id="5mr7UHcctx2" role="1DdaDG">
+                <node concept="37vLTw" id="5mr7UHcctpr" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5mr7UHcbsDS" resolve="evaluationSession" />
                 </node>
-                <node concept="2ShNRf" id="6HT7BWBUcvL" role="33vP2m">
-                  <node concept="1pGfFk" id="6HT7BWBUcvM" role="2ShVmc">
-                    <ref role="37wK5l" node="6HT7BWBSKlD" resolve="RunTypecheckingRules.TypeFormatter" />
-                    <node concept="37vLTw" id="6HT7BWBUcvY" role="37wK5m">
-                      <ref role="3cqZAo" node="41ox5Vnmwcb" resolve="handler" />
-                    </node>
+                <node concept="liA8E" id="5mr7UHcct$i" role="2OqNvi">
+                  <ref role="37wK5l" to="rchb:5mr7UHccvdG" resolve="constraintOccurrences" />
+                  <node concept="37vLTw" id="5mr7UHcctGr" role="37wK5m">
+                    <ref role="3cqZAo" node="5mr7UHcc5Jp" resolve="cs" />
                   </node>
                 </node>
               </node>
             </node>
-            <node concept="3clFbF" id="6HT7BWBUcvO" role="3cqZAp">
-              <node concept="2OqwBi" id="6HT7BWBUcvP" role="3clFbG">
-                <node concept="37vLTw" id="6HT7BWBUcvQ" role="2Oq$k0">
-                  <ref role="3cqZAo" node="6HT7BWBUcvJ" resolve="formatter" />
-                </node>
-                <node concept="liA8E" id="6HT7BWBUcvR" role="2OqNvi">
-                  <ref role="37wK5l" node="6HT7BWBSGZH" resolve="initialize" />
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-            <node concept="3clFbF" id="6HT7BWBUcvS" role="3cqZAp">
-              <node concept="2OqwBi" id="6HT7BWBUcvT" role="3clFbG">
-                <node concept="37vLTw" id="6HT7BWBUcvU" role="2Oq$k0">
-                  <ref role="3cqZAo" node="6HT7BWBUcvJ" resolve="formatter" />
-                </node>
-                <node concept="liA8E" id="6HT7BWBUcvV" role="2OqNvi">
-                  <ref role="37wK5l" node="6HT7BWBSMTp" resolve="collectTypes" />
-                  <node concept="37vLTw" id="6HT7BWBUw0F" role="37wK5m">
-                    <ref role="3cqZAo" node="6HT7BWBUumb" resolve="types" />
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-                </node>
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-            <node concept="3cpWs6" id="7dgRGU4prm1" role="3cqZAp">
-              <node concept="37vLTw" id="7dgRGU4psnb" role="3cqZAk">
-                <ref role="3cqZAo" node="7dgRGU4oLq3" resolve="remainingOk" />
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-            </node>
           </node>
-          <node concept="TDmWw" id="41ox5Vnkj0R" role="TEbGg">
-            <node concept="3clFbS" id="41ox5Vnkj0S" role="TDEfX">
-              <node concept="YS8fn" id="41ox5VnktR8" role="3cqZAp">
-                <node concept="2ShNRf" id="41ox5VnktRu" role="YScLw">
-                  <node concept="1pGfFk" id="41ox5VnkEqN" role="2ShVmc">
-                    <ref role="37wK5l" to="wyt6:~RuntimeException.&lt;init&gt;(java.lang.Throwable)" resolve="RuntimeException" />
-                    <node concept="37vLTw" id="41ox5VnkEDR" role="37wK5m">
-                      <ref role="3cqZAo" node="41ox5Vnkj0T" resolve="e" />
-                    </node>
-                  </node>
+          <node concept="3cpWsn" id="5mr7UHcc5Jp" role="1Duv9x">
+            <property role="TrG5h" value="cs" />
+            <node concept="3uibUv" id="5mr7UHcc6gS" role="1tU5fm">
+              <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
+            </node>
+          </node>
+          <node concept="2OqwBi" id="5mr7UHcc6Lo" role="1DdaDG">
+            <node concept="37vLTw" id="5mr7UHcc6_i" role="2Oq$k0">
+              <ref role="3cqZAo" node="5mr7UHcbsDS" resolve="evaluationSession" />
+            </node>
+            <node concept="liA8E" id="5mr7UHcc6U$" role="2OqNvi">
+              <ref role="37wK5l" to="rchb:5uFPQ7BvQyO" resolve="constraintSymbols" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="1CgWc1Tkrhh" role="3cqZAp" />
+        <node concept="3cpWs8" id="6HT7BWBUcvI" role="3cqZAp">
+          <node concept="3cpWsn" id="6HT7BWBUcvJ" role="3cpWs9">
+            <property role="TrG5h" value="formatter" />
+            <node concept="3uibUv" id="6HT7BWBUcvK" role="1tU5fm">
+              <ref role="3uigEE" node="6HT7BWBSFOV" resolve="RunTypecheckingRules.TypeFormatter" />
+            </node>
+            <node concept="2ShNRf" id="6HT7BWBUcvL" role="33vP2m">
+              <node concept="1pGfFk" id="6HT7BWBUcvM" role="2ShVmc">
+                <ref role="37wK5l" node="6HT7BWBSKlD" resolve="RunTypecheckingRules.TypeFormatter" />
+                <node concept="37vLTw" id="5mr7UHcd3hf" role="37wK5m">
+                  <ref role="3cqZAo" node="5mr7UHcbsDS" resolve="evaluationSession" />
                 </node>
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+                        <ref role="37wK5l" to="18ew:~JavaNameUtil.fqClassName(org.jetbrains.mps.openapi.model.SModel,java.lang.String):java.lang.String" resolve="fqClassName" />
+                        <ref role="1Pybhc" to="18ew:~JavaNameUtil" resolve="JavaNameUtil" />
+                        <node concept="37vLTw" id="5mr7UHcbKeN" role="37wK5m">
+                          <ref role="3cqZAo" node="5mr7UHcbKeH" resolve="handlerMdl" />
+                        </node>
+                        <node concept="3cpWs3" id="5mr7UHcbKer" role="37wK5m">
+                          <node concept="Xl_RD" id="5mr7UHcbKes" role="3uHU7w">
+                            <property role="Xl_RC" value="Handler" />
+                          </node>
+                          <node concept="3cpWs3" id="5mr7UHcbKet" role="3uHU7B">
+                            <node concept="Xl_RD" id="5mr7UHcbKeu" role="3uHU7B">
+                              <property role="Xl_RC" value="Typechecking" />
+                            </node>
+                            <node concept="37vLTw" id="5mr7UHcbKeM" role="3uHU7w">
+                              <ref role="3cqZAo" node="5mr7UHcbKeJ" resolve="name" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="37vLTw" id="5mr7UHcbKew" role="37vLTJ">
+                  <ref role="3cqZAo" node="5mr7UHcbKe9" resolve="handlerCls" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="TDmWw" id="5mr7UHcbKex" role="TEbGg">
+            <node concept="3clFbS" id="5mr7UHcbKey" role="TDEfX">
+              <node concept="YS8fn" id="5mr7UHcbKez" role="3cqZAp">
+                <node concept="2ShNRf" id="5mr7UHcbKe$" role="YScLw">
+                  <node concept="1pGfFk" id="5mr7UHcbKe_" role="2ShVmc">
+                    <ref role="37wK5l" to="wyt6:~RuntimeException.&lt;init&gt;(java.lang.Throwable)" resolve="RuntimeException" />
+                    <node concept="37vLTw" id="5mr7UHcbKeA" role="37wK5m">
+                      <ref role="3cqZAo" node="5mr7UHcbKeB" resolve="e" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3cpWsn" id="5mr7UHcbKeB" role="TDEfY">
+              <property role="TrG5h" value="e" />
+              <node concept="3uibUv" id="5mr7UHcbKeC" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~ClassNotFoundException" resolve="ClassNotFoundException" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs6" id="5mr7UHcbKeD" role="3cqZAp">
+          <node concept="37vLTw" id="5mr7UHcbKeE" role="3cqZAk">
+            <ref role="3cqZAo" node="5mr7UHcbKe9" resolve="handlerCls" />
+          </node>
+        </node>
       </node>
+    </node>
+    <node concept="2tJIrI" id="41ox5VnkaHc" role="jymVt" />
+    <node concept="312cEu" id="6HT7BWBSFOV" role="jymVt">
+      <property role="2bfB8j" value="false" />
+      <property role="TrG5h" value="TypeFormatter" />
       <node concept="2tJIrI" id="6HT7BWBSGy6" role="jymVt" />
       <node concept="3clFbW" id="6HT7BWBSKlD" role="jymVt">
         <node concept="3cqZAl" id="6HT7BWBSKlF" role="3clF45" />
         <node concept="3Tm6S6" id="6HT7BWBSKlG" role="1B3o_S" />
         <node concept="3clFbS" id="6HT7BWBSKlH" role="3clF47">
-          <node concept="3clFbF" id="6HT7BWBSLlb" role="3cqZAp">
-            <node concept="37vLTI" id="6HT7BWBSLGf" role="3clFbG">
-              <node concept="37vLTw" id="6HT7BWBSLZs" role="37vLTx">
-                <ref role="3cqZAo" node="6HT7BWBSKVT" resolve="handler" />
-              </node>
-              <node concept="2OqwBi" id="6HT7BWBSLl_" role="37vLTJ">
-                <node concept="Xjq3P" id="6HT7BWBSLla" role="2Oq$k0" />
-                <node concept="2OwXpG" id="6HT7BWBSLsM" role="2OqNvi">
-                  <ref role="2Oxat5" node="6HT7BWBSIh7" resolve="handler" />
+          <node concept="3clFbF" id="5mr7UHccA66" role="3cqZAp">
+            <node concept="37vLTI" id="5mr7UHccA68" role="3clFbG">
+              <node concept="2OqwBi" id="5mr7UHccA6c" role="37vLTJ">
+                <node concept="Xjq3P" id="5mr7UHccA6f" role="2Oq$k0" />
+                <node concept="2OwXpG" id="5mr7UHccA6b" role="2OqNvi">
+                  <ref role="2Oxat5" node="5mr7UHccA62" resolve="session" />
                 </node>
               </node>
+              <node concept="37vLTw" id="5mr7UHccA6g" role="37vLTx">
+                <ref role="3cqZAo" node="5mr7UHcc_UA" resolve="session" />
+              </node>
             </node>
           </node>
         </node>
-        <node concept="37vLTG" id="6HT7BWBSKVT" role="3clF46">
-          <property role="TrG5h" value="handler" />
-          <node concept="3uibUv" id="6HT7BWBSKVS" role="1tU5fm">
-            <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+        <node concept="37vLTG" id="5mr7UHcc_UA" role="3clF46">
+          <property role="TrG5h" value="session" />
+          <node concept="3uibUv" id="5mr7UHcc_U_" role="1tU5fm">
+            <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
           </node>
         </node>
       </node>
@@ -2890,20 +2398,21 @@
             <node concept="3clFbS" id="6HT7BWBSISA" role="2LFqv$">
               <node concept="3clFbJ" id="6HT7BWBSISB" role="3cqZAp">
                 <node concept="3clFbS" id="6HT7BWBSISC" role="3clFbx">
-                  <node concept="3cpWs8" id="6HT7BWBSISD" role="3cqZAp">
-                    <node concept="3cpWsn" id="6HT7BWBSISE" role="3cpWs9">
+                  <node concept="3cpWs8" id="5mr7UHccPOE" role="3cqZAp">
+                    <node concept="3cpWsn" id="5mr7UHccPOF" role="3cpWs9">
                       <property role="TrG5h" value="args" />
-                      <node concept="10Q1$e" id="6HT7BWBSISF" role="1tU5fm">
-                        <node concept="3uibUv" id="6HT7BWBSISG" role="10Q1$1">
+                      <node concept="3uibUv" id="5mr7UHccPOw" role="1tU5fm">
+                        <ref role="3uigEE" to="33ny:~List" resolve="List" />
+                        <node concept="3uibUv" id="5mr7UHccPOz" role="11_B2D">
                           <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
                         </node>
                       </node>
-                      <node concept="2OqwBi" id="6HT7BWBSISH" role="33vP2m">
-                        <node concept="37vLTw" id="6HT7BWBSISI" role="2Oq$k0">
-                          <ref role="3cqZAo" node="6HT7BWBSITO" resolve="c" />
+                      <node concept="2OqwBi" id="5mr7UHccPOG" role="33vP2m">
+                        <node concept="37vLTw" id="5mr7UHccPOH" role="2Oq$k0">
+                          <ref role="3cqZAo" node="6HT7BWBSITO" resolve="co" />
                         </node>
-                        <node concept="liA8E" id="6HT7BWBSISJ" role="2OqNvi">
-                          <ref role="37wK5l" to="eifs:~IConstraint.getArguments():java.lang.Object[]" resolve="getArguments" />
+                        <node concept="liA8E" id="5mr7UHccPOI" role="2OqNvi">
+                          <ref role="37wK5l" to="qrld:5uFPQ7BZafw" resolve="arguments" />
                         </node>
                       </node>
                     </node>
@@ -2918,12 +2427,15 @@
                         <node concept="3uibUv" id="6HT7BWBSISO" role="10QFUM">
                           <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
                         </node>
-                        <node concept="AH0OO" id="6HT7BWBSISP" role="10QFUP">
-                          <node concept="3cmrfG" id="6HT7BWBSISQ" role="AHEQo">
-                            <property role="3cmrfH" value="0" />
+                        <node concept="2OqwBi" id="5mr7UHccT6M" role="10QFUP">
+                          <node concept="37vLTw" id="6HT7BWBSISR" role="2Oq$k0">
+                            <ref role="3cqZAo" node="5mr7UHccPOF" resolve="args" />
                           </node>
-                          <node concept="37vLTw" id="6HT7BWBSISR" role="AHHXb">
-                            <ref role="3cqZAo" node="6HT7BWBSISE" resolve="args" />
+                          <node concept="liA8E" id="5mr7UHccTuz" role="2OqNvi">
+                            <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                            <node concept="3cmrfG" id="5mr7UHccTNA" role="37wK5m">
+                              <property role="3cmrfH" value="0" />
+                            </node>
                           </node>
                         </node>
                       </node>
@@ -2947,12 +2459,15 @@
                         <node concept="2YIFZM" id="6HT7BWBSIT1" role="37wK5m">
                           <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
                           <ref role="37wK5l" to="wyt6:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
-                          <node concept="AH0OO" id="6HT7BWBSIT2" role="37wK5m">
-                            <node concept="3cmrfG" id="6HT7BWBSIT3" role="AHEQo">
-                              <property role="3cmrfH" value="1" />
+                          <node concept="2OqwBi" id="5mr7UHccUqz" role="37wK5m">
+                            <node concept="37vLTw" id="6HT7BWBSIT4" role="2Oq$k0">
+                              <ref role="3cqZAo" node="5mr7UHccPOF" resolve="args" />
                             </node>
-                            <node concept="37vLTw" id="6HT7BWBSIT4" role="AHHXb">
-                              <ref role="3cqZAo" node="6HT7BWBSISE" resolve="args" />
+                            <node concept="liA8E" id="5mr7UHccULM" role="2OqNvi">
+                              <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                              <node concept="3cmrfG" id="5mr7UHccV2G" role="37wK5m">
+                                <property role="3cmrfH" value="1" />
+                              </node>
                             </node>
                           </node>
                         </node>
@@ -2966,12 +2481,22 @@
                   </node>
                   <node concept="liA8E" id="6HT7BWBSIT7" role="2OqNvi">
                     <ref role="37wK5l" to="wyt6:~String.equals(java.lang.Object):boolean" resolve="equals" />
-                    <node concept="2OqwBi" id="6HT7BWBSIT8" role="37wK5m">
-                      <node concept="37vLTw" id="6HT7BWBSIT9" role="2Oq$k0">
-                        <ref role="3cqZAo" node="6HT7BWBSITO" resolve="c" />
+                    <node concept="2OqwBi" id="5mr7UHccPyE" role="37wK5m">
+                      <node concept="2OqwBi" id="5mr7UHccPsf" role="2Oq$k0">
+                        <node concept="2OqwBi" id="6HT7BWBSIT8" role="2Oq$k0">
+                          <node concept="37vLTw" id="6HT7BWBSIT9" role="2Oq$k0">
+                            <ref role="3cqZAo" node="6HT7BWBSITO" resolve="co" />
+                          </node>
+                          <node concept="liA8E" id="5mr7UHccPr0" role="2OqNvi">
+                            <ref role="37wK5l" to="qrld:5uFPQ7BZacZ" resolve="constraint" />
+                          </node>
+                        </node>
+                        <node concept="liA8E" id="5mr7UHccPwp" role="2OqNvi">
+                          <ref role="37wK5l" to="qrld:5uFPQ7B_aTC" resolve="symbol" />
+                        </node>
                       </node>
-                      <node concept="liA8E" id="6HT7BWBSITa" role="2OqNvi">
-                        <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                      <node concept="liA8E" id="5mr7UHccP_E" role="2OqNvi">
+                        <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
                       </node>
                     </node>
                   </node>
@@ -2979,20 +2504,21 @@
               </node>
               <node concept="3clFbJ" id="6HT7BWBSITb" role="3cqZAp">
                 <node concept="3clFbS" id="6HT7BWBSITc" role="3clFbx">
-                  <node concept="3cpWs8" id="6HT7BWBSITd" role="3cqZAp">
-                    <node concept="3cpWsn" id="6HT7BWBSITe" role="3cpWs9">
+                  <node concept="3cpWs8" id="5mr7UHccV_h" role="3cqZAp">
+                    <node concept="3cpWsn" id="5mr7UHccV_i" role="3cpWs9">
                       <property role="TrG5h" value="args" />
-                      <node concept="10Q1$e" id="6HT7BWBSITf" role="1tU5fm">
-                        <node concept="3uibUv" id="6HT7BWBSITg" role="10Q1$1">
+                      <node concept="3uibUv" id="5mr7UHccV_b" role="1tU5fm">
+                        <ref role="3uigEE" to="33ny:~List" resolve="List" />
+                        <node concept="3uibUv" id="5mr7UHccV_e" role="11_B2D">
                           <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
                         </node>
                       </node>
-                      <node concept="2OqwBi" id="6HT7BWBSITh" role="33vP2m">
-                        <node concept="37vLTw" id="6HT7BWBSITi" role="2Oq$k0">
-                          <ref role="3cqZAo" node="6HT7BWBSITO" resolve="c" />
+                      <node concept="2OqwBi" id="5mr7UHccV_j" role="33vP2m">
+                        <node concept="37vLTw" id="5mr7UHccV_k" role="2Oq$k0">
+                          <ref role="3cqZAo" node="6HT7BWBSITO" resolve="co" />
                         </node>
-                        <node concept="liA8E" id="6HT7BWBSITj" role="2OqNvi">
-                          <ref role="37wK5l" to="eifs:~IConstraint.getArguments():java.lang.Object[]" resolve="getArguments" />
+                        <node concept="liA8E" id="5mr7UHccV_l" role="2OqNvi">
+                          <ref role="37wK5l" to="qrld:5uFPQ7BZafw" resolve="arguments" />
                         </node>
                       </node>
                     </node>
@@ -3007,12 +2533,15 @@
                         <node concept="3uibUv" id="6HT7BWBSITo" role="10QFUM">
                           <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
                         </node>
-                        <node concept="AH0OO" id="6HT7BWBSITp" role="10QFUP">
-                          <node concept="3cmrfG" id="6HT7BWBSITq" role="AHEQo">
-                            <property role="3cmrfH" value="0" />
+                        <node concept="2OqwBi" id="5mr7UHccWG7" role="10QFUP">
+                          <node concept="37vLTw" id="5mr7UHccWi3" role="2Oq$k0">
+                            <ref role="3cqZAo" node="5mr7UHccV_i" resolve="args" />
                           </node>
-                          <node concept="37vLTw" id="6HT7BWBSITr" role="AHHXb">
-                            <ref role="3cqZAo" node="6HT7BWBSITe" resolve="args" />
+                          <node concept="liA8E" id="5mr7UHccWZ_" role="2OqNvi">
+                            <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                            <node concept="3cmrfG" id="5mr7UHccXgl" role="37wK5m">
+                              <property role="3cmrfH" value="0" />
+                            </node>
                           </node>
                         </node>
                       </node>
@@ -3028,12 +2557,15 @@
                         <node concept="3uibUv" id="6HT7BWBSITw" role="10QFUM">
                           <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
                         </node>
-                        <node concept="AH0OO" id="6HT7BWBSITx" role="10QFUP">
-                          <node concept="3cmrfG" id="6HT7BWBSITy" role="AHEQo">
-                            <property role="3cmrfH" value="1" />
+                        <node concept="2OqwBi" id="5mr7UHccXT1" role="10QFUP">
+                          <node concept="37vLTw" id="5mr7UHccXzl" role="2Oq$k0">
+                            <ref role="3cqZAo" node="5mr7UHccV_i" resolve="args" />
                           </node>
-                          <node concept="37vLTw" id="6HT7BWBSITz" role="AHHXb">
-                            <ref role="3cqZAo" node="6HT7BWBSITe" resolve="args" />
+                          <node concept="liA8E" id="5mr7UHccYcv" role="2OqNvi">
+                            <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                            <node concept="3cmrfG" id="5mr7UHccYsl" role="37wK5m">
+                              <property role="3cmrfH" value="1" />
+                            </node>
                           </node>
                         </node>
                       </node>
@@ -3072,12 +2604,22 @@
                   </node>
                   <node concept="liA8E" id="6HT7BWBSITK" role="2OqNvi">
                     <ref role="37wK5l" to="wyt6:~String.equals(java.lang.Object):boolean" resolve="equals" />
-                    <node concept="2OqwBi" id="6HT7BWBSITL" role="37wK5m">
-                      <node concept="37vLTw" id="6HT7BWBSITM" role="2Oq$k0">
-                        <ref role="3cqZAo" node="6HT7BWBSITO" resolve="c" />
+                    <node concept="2OqwBi" id="5mr7UHccVjA" role="37wK5m">
+                      <node concept="2OqwBi" id="5mr7UHccVdD" role="2Oq$k0">
+                        <node concept="2OqwBi" id="6HT7BWBSITL" role="2Oq$k0">
+                          <node concept="37vLTw" id="6HT7BWBSITM" role="2Oq$k0">
+                            <ref role="3cqZAo" node="6HT7BWBSITO" resolve="co" />
+                          </node>
+                          <node concept="liA8E" id="5mr7UHccVbW" role="2OqNvi">
+                            <ref role="37wK5l" to="qrld:5uFPQ7BZacZ" resolve="constraint" />
+                          </node>
+                        </node>
+                        <node concept="liA8E" id="5mr7UHccVhB" role="2OqNvi">
+                          <ref role="37wK5l" to="qrld:5uFPQ7B_aTC" resolve="symbol" />
+                        </node>
                       </node>
-                      <node concept="liA8E" id="6HT7BWBSITN" role="2OqNvi">
-                        <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                      <node concept="liA8E" id="5mr7UHccVn4" role="2OqNvi">
+                        <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
                       </node>
                     </node>
                   </node>
@@ -3085,13 +2627,18 @@
               </node>
             </node>
             <node concept="3cpWsn" id="6HT7BWBSITO" role="1Duv9x">
-              <property role="TrG5h" value="c" />
-              <node concept="3uibUv" id="6HT7BWBSITP" role="1tU5fm">
-                <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+              <property role="TrG5h" value="co" />
+              <node concept="3uibUv" id="5mr7UHccNvh" role="1tU5fm">
+                <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
               </node>
             </node>
-            <node concept="37vLTw" id="6HT7BWBSITQ" role="1DdaDG">
-              <ref role="3cqZAo" node="6HT7BWBSIh7" resolve="handler" />
+            <node concept="2OqwBi" id="5mr7UHccP5I" role="1DdaDG">
+              <node concept="37vLTw" id="5mr7UHccOFC" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHccA62" resolve="session" />
+              </node>
+              <node concept="liA8E" id="5mr7UHccPmJ" role="2OqNvi">
+                <ref role="37wK5l" to="rchb:5uFPQ7BvQxv" resolve="constraintOccurrences" />
+              </node>
             </node>
           </node>
         </node>
@@ -3130,16 +2677,19 @@
                         <node concept="3uibUv" id="6HT7BWBSNti" role="10QFUM">
                           <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
                         </node>
-                        <node concept="AH0OO" id="6HT7BWBSNtj" role="10QFUP">
-                          <node concept="3cmrfG" id="6HT7BWBSNtk" role="AHEQo">
-                            <property role="3cmrfH" value="0" />
-                          </node>
-                          <node concept="2OqwBi" id="6HT7BWBT_Hd" role="AHHXb">
+                        <node concept="2OqwBi" id="5mr7UHcd1e8" role="10QFUP">
+                          <node concept="2OqwBi" id="6HT7BWBT_Hd" role="2Oq$k0">
                             <node concept="37vLTw" id="6HT7BWBT_He" role="2Oq$k0">
-                              <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="c" />
+                              <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="co" />
                             </node>
-                            <node concept="liA8E" id="6HT7BWBT_Hf" role="2OqNvi">
-                              <ref role="37wK5l" to="eifs:~IConstraint.getArguments():java.lang.Object[]" resolve="getArguments" />
+                            <node concept="liA8E" id="5mr7UHcd0RC" role="2OqNvi">
+                              <ref role="37wK5l" to="qrld:5uFPQ7BZafw" resolve="arguments" />
+                            </node>
+                          </node>
+                          <node concept="liA8E" id="5mr7UHcd1AO" role="2OqNvi">
+                            <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                            <node concept="3cmrfG" id="5mr7UHcd1Wg" role="37wK5m">
+                              <property role="3cmrfH" value="0" />
                             </node>
                           </node>
                         </node>
@@ -3316,16 +2866,19 @@
                         <node concept="3uibUv" id="6HT7BWBSNv_" role="10QFUM">
                           <ref role="3uigEE" to="ie8e:1bm7a6EXvsP" resolve="Atom" />
                         </node>
-                        <node concept="AH0OO" id="6HT7BWBSNvA" role="10QFUP">
-                          <node concept="3cmrfG" id="6HT7BWBSNvB" role="AHEQo">
-                            <property role="3cmrfH" value="1" />
-                          </node>
-                          <node concept="2OqwBi" id="6HT7BWBT_NW" role="AHHXb">
+                        <node concept="2OqwBi" id="5mr7UHcd2oT" role="10QFUP">
+                          <node concept="2OqwBi" id="6HT7BWBT_NW" role="2Oq$k0">
                             <node concept="37vLTw" id="6HT7BWBT_NX" role="2Oq$k0">
-                              <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="c" />
+                              <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="co" />
                             </node>
-                            <node concept="liA8E" id="6HT7BWBT_NY" role="2OqNvi">
-                              <ref role="37wK5l" to="eifs:~IConstraint.getArguments():java.lang.Object[]" resolve="getArguments" />
+                            <node concept="liA8E" id="5mr7UHcd2ad" role="2OqNvi">
+                              <ref role="37wK5l" to="qrld:5uFPQ7BZafw" resolve="arguments" />
+                            </node>
+                          </node>
+                          <node concept="liA8E" id="5mr7UHcd2Hq" role="2OqNvi">
+                            <ref role="37wK5l" to="33ny:~List.get(int):java.lang.Object" resolve="get" />
+                            <node concept="3cmrfG" id="5mr7UHcd2YZ" role="37wK5m">
+                              <property role="3cmrfH" value="0" />
                             </node>
                           </node>
                         </node>
@@ -3379,12 +2932,22 @@
                   </node>
                   <node concept="liA8E" id="6HT7BWBSNvR" role="2OqNvi">
                     <ref role="37wK5l" to="wyt6:~String.equals(java.lang.Object):boolean" resolve="equals" />
-                    <node concept="2OqwBi" id="6HT7BWBSNvS" role="37wK5m">
-                      <node concept="37vLTw" id="6HT7BWBSNvT" role="2Oq$k0">
-                        <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="c" />
+                    <node concept="2OqwBi" id="5mr7UHcd0DT" role="37wK5m">
+                      <node concept="2OqwBi" id="5mr7UHcd0zT" role="2Oq$k0">
+                        <node concept="2OqwBi" id="6HT7BWBSNvS" role="2Oq$k0">
+                          <node concept="37vLTw" id="6HT7BWBSNvT" role="2Oq$k0">
+                            <ref role="3cqZAo" node="6HT7BWBSNvV" resolve="co" />
+                          </node>
+                          <node concept="liA8E" id="5mr7UHcd0y8" role="2OqNvi">
+                            <ref role="37wK5l" to="qrld:5uFPQ7BZacZ" resolve="constraint" />
+                          </node>
+                        </node>
+                        <node concept="liA8E" id="5mr7UHcd0Cu" role="2OqNvi">
+                          <ref role="37wK5l" to="qrld:5uFPQ7B_aTC" resolve="symbol" />
+                        </node>
                       </node>
-                      <node concept="liA8E" id="6HT7BWBSNvU" role="2OqNvi">
-                        <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                      <node concept="liA8E" id="5mr7UHcd0GT" role="2OqNvi">
+                        <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
                       </node>
                     </node>
                   </node>
@@ -3392,13 +2955,18 @@
               </node>
             </node>
             <node concept="3cpWsn" id="6HT7BWBSNvV" role="1Duv9x">
-              <property role="TrG5h" value="c" />
-              <node concept="3uibUv" id="6HT7BWBSNvW" role="1tU5fm">
-                <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+              <property role="TrG5h" value="co" />
+              <node concept="3uibUv" id="5mr7UHccYSM" role="1tU5fm">
+                <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
               </node>
             </node>
-            <node concept="37vLTw" id="6HT7BWBSNvX" role="1DdaDG">
-              <ref role="3cqZAo" node="6HT7BWBSIh7" resolve="handler" />
+            <node concept="2OqwBi" id="5mr7UHcd0a6" role="1DdaDG">
+              <node concept="37vLTw" id="5mr7UHccZHb" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHccA62" resolve="session" />
+              </node>
+              <node concept="liA8E" id="5mr7UHcd0tX" role="2OqNvi">
+                <ref role="37wK5l" to="rchb:5uFPQ7BvQxv" resolve="constraintOccurrences" />
+              </node>
             </node>
           </node>
         </node>
@@ -3820,6 +3388,60 @@
         </node>
       </node>
       <node concept="2tJIrI" id="41ox5Vnk7lH" role="jymVt" />
+      <node concept="2tJIrI" id="5mr7UHccAU0" role="jymVt" />
+      <node concept="312cEg" id="6HT7BWBSGym" role="jymVt">
+        <property role="TrG5h" value="varnames" />
+        <property role="3TUv4t" value="false" />
+        <node concept="3Tm6S6" id="6HT7BWBSGyn" role="1B3o_S" />
+        <node concept="3uibUv" id="6HT7BWBSGyp" role="1tU5fm">
+          <ref role="3uigEE" to="33ny:~Map" resolve="Map" />
+          <node concept="3uibUv" id="2s5CcPapSKW" role="11_B2D">
+            <ref role="3uigEE" to="45ys:1mP5b6jQP$C" resolve="ILogical" />
+          </node>
+          <node concept="17QB3L" id="6HT7BWBSGyr" role="11_B2D" />
+        </node>
+        <node concept="2ShNRf" id="6HT7BWBSGDQ" role="33vP2m">
+          <node concept="1pGfFk" id="6HT7BWBSGDR" role="2ShVmc">
+            <ref role="37wK5l" to="33ny:~HashMap.&lt;init&gt;()" resolve="HashMap" />
+            <node concept="3uibUv" id="5kEUewdDhpK" role="1pMfVU">
+              <ref role="3uigEE" to="45ys:1mP5b6jQP$C" resolve="ILogical" />
+            </node>
+            <node concept="17QB3L" id="6HT7BWBSGDT" role="1pMfVU" />
+          </node>
+        </node>
+      </node>
+      <node concept="312cEg" id="6HT7BWBSGys" role="jymVt">
+        <property role="TrG5h" value="ubounds" />
+        <property role="3TUv4t" value="false" />
+        <node concept="3Tm6S6" id="6HT7BWBSGyt" role="1B3o_S" />
+        <node concept="3uibUv" id="6HT7BWBSGyv" role="1tU5fm">
+          <ref role="3uigEE" to="33ny:~Map" resolve="Map" />
+          <node concept="3uibUv" id="6HT7BWBSGyw" role="11_B2D">
+            <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+          </node>
+          <node concept="3uibUv" id="6HT7BWBSGyx" role="11_B2D">
+            <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+          </node>
+        </node>
+        <node concept="2ShNRf" id="6HT7BWBSGI3" role="33vP2m">
+          <node concept="1pGfFk" id="6HT7BWBSGI4" role="2ShVmc">
+            <ref role="37wK5l" to="33ny:~HashMap.&lt;init&gt;()" resolve="HashMap" />
+            <node concept="3uibUv" id="6HT7BWBSGI5" role="1pMfVU">
+              <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+            </node>
+            <node concept="3uibUv" id="6HT7BWBSGI6" role="1pMfVU">
+              <ref role="3uigEE" to="oy3s:4U_yxogAknZ" resolve="AtomLogical" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="312cEg" id="5mr7UHccA62" role="jymVt">
+        <property role="TrG5h" value="session" />
+        <node concept="3Tm6S6" id="5mr7UHccA63" role="1B3o_S" />
+        <node concept="3uibUv" id="5mr7UHccA65" role="1tU5fm">
+          <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
+        </node>
+      </node>
     </node>
     <node concept="2tJIrI" id="6HT7BWBT8vT" role="jymVt" />
     <node concept="3Tm1VV" id="41ox5Vnk76b" role="1B3o_S" />
@@ -4946,8 +4568,8 @@
       <property role="TrG5h" value="result" />
       <node concept="37vLTG" id="7FtwPOZHe8Q" role="3clF46">
         <property role="TrG5h" value="constraint" />
-        <node concept="3uibUv" id="7FtwPOZHrA1" role="1tU5fm">
-          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        <node concept="3uibUv" id="5mr7UHcce83" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
       <node concept="3cqZAl" id="7FtwPOZHe8V" role="3clF45" />
@@ -4983,8 +4605,8 @@
       <property role="TrG5h" value="garbage" />
       <node concept="37vLTG" id="7nkyKX7gYtK" role="3clF46">
         <property role="TrG5h" value="constraint" />
-        <node concept="3uibUv" id="7nkyKX7gYtL" role="1tU5fm">
-          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        <node concept="3uibUv" id="5mr7UHccezE" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
       <node concept="3cqZAl" id="7nkyKX7gYtM" role="3clF45" />
diff --git a/languages/jetbrains.mps.logic/jchr/jetbrains.mps.logic.jchr.msd b/languages/jetbrains.mps.logic/jchr/jetbrains.mps.logic.jchr.msd
index 59afd2ea..cf6af69c 100644
--- a/languages/jetbrains.mps.logic/jchr/jetbrains.mps.logic.jchr.msd
+++ b/languages/jetbrains.mps.logic/jchr/jetbrains.mps.logic.jchr.msd
@@ -11,17 +11,32 @@
     <dependency reexport="true">a5478664-6b44-4c62-a9f7-434f8aa57eee(jetbrains.mps.logic.runtime)</dependency>
     <dependency reexport="true">b984ee52-f34d-4b6d-8812-866c1d3eae31(jetbrains.mps.jchr.runtime)</dependency>
     <dependency reexport="true">bbf5c548-7111-4a53-a117-cdefc664cf34(jetbrains.mps.logic.reactor)</dependency>
+    <dependency reexport="false">35e2a720-13d8-4eda-88d3-ff9d78d5a3ae(jetbrains.mps.lang.typesystem2.sampleplugin)</dependency>
+    <dependency reexport="false">7526e0cf-1ce7-46f8-a555-9eca1e06c23b(jetbrains.mps.logic.atom)</dependency>
+    <dependency reexport="false">26e8f4ce-2a35-4f44-8065-e5ba154b18e9(jetbrains.mps.lang.typesystem2.runtime)</dependency>
+    <dependency reexport="false">c246f30f-e11c-4dc1-80c6-154d0aebc8b3(jetbrains.mps.lang.typesystem2.samplechecker.runner)</dependency>
   </dependencies>
   <languageVersions>
     <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" fqName="jetbrains.mps.baseLanguage" version="4" />
     <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="760a0a8c-eabb-4521-8bfd-65db761a9ba3" fqName="jetbrains.mps.baseLanguage.logging" version="0" />
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" fqName="jetbrains.mps.lang.core" version="1" />
     <language id="9ded098b-ad6a-4657-bfd9-48636cfe8bc3" fqName="jetbrains.mps.lang.traceable" version="0" />
   </languageVersions>
   <dependencyVersions>
+    <module reference="3f233e7f-b8a6-46d2-a57f-795d56775243(Annotations)" version="0" />
     <module reference="6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)" version="0" />
+    <module reference="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)" version="0" />
+    <module reference="1ed103c3-3aa6-49b7-9c21-6765ee11f224(MPS.Editor)" version="0" />
+    <module reference="498d89d2-c2e9-11e2-ad49-6cf049e62fe5(MPS.IDEA)" version="0" />
+    <module reference="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
+    <module reference="742f6602-5a2f-4313-aa6e-ae1cd4ffdc61(MPS.Platform)" version="0" />
     <module reference="b984ee52-f34d-4b6d-8812-866c1d3eae31(jetbrains.mps.jchr.runtime)" version="0" />
+    <module reference="26e8f4ce-2a35-4f44-8065-e5ba154b18e9(jetbrains.mps.lang.typesystem2.runtime)" version="0" />
+    <module reference="c246f30f-e11c-4dc1-80c6-154d0aebc8b3(jetbrains.mps.lang.typesystem2.samplechecker.runner)" version="0" />
+    <module reference="35e2a720-13d8-4eda-88d3-ff9d78d5a3ae(jetbrains.mps.lang.typesystem2.sampleplugin)" version="0" />
     <module reference="7526e0cf-1ce7-46f8-a555-9eca1e06c23b(jetbrains.mps.logic.atom)" version="0" />
     <module reference="760652ad-c01a-495e-9510-ed51532f617b(jetbrains.mps.logic.jchr)" version="0" />
     <module reference="bbf5c548-7111-4a53-a117-cdefc664cf34(jetbrains.mps.logic.reactor)" version="0" />
diff --git a/languages/jetbrains.mps.logic/jchr/models/jetbrains/mps/logic/jchr/program.mps b/languages/jetbrains.mps.logic/jchr/models/jetbrains/mps/logic/jchr/program.mps
index edea7f56..76e2f48b 100644
--- a/languages/jetbrains.mps.logic/jchr/models/jetbrains/mps/logic/jchr/program.mps
+++ b/languages/jetbrains.mps.logic/jchr/models/jetbrains/mps/logic/jchr/program.mps
@@ -5,6 +5,8 @@
     <use id="ed6d7656-532c-4bc2-81d1-af945aeb8280" name="jetbrains.mps.baseLanguage.blTypes" version="0" />
     <use id="9ded098b-ad6a-4657-bfd9-48636cfe8bc3" name="jetbrains.mps.lang.traceable" version="0" />
     <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="4" />
+    <use id="760a0a8c-eabb-4521-8bfd-65db761a9ba3" name="jetbrains.mps.baseLanguage.logging" version="0" />
+    <use id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections" version="0" />
   </languages>
   <imports>
     <import index="rchb" ref="r:f43ee4a0-488a-425a-87a0-594ab3b0d15f(jetbrains.mps.logic.reactor.program)" />
@@ -14,18 +16,39 @@
     <import index="xq5w" ref="r:729bada4-05fa-458f-8bf8-28b9cb978726(jetbrains.mps.logic.builtin.var)" />
     <import index="e2ud" ref="r:86a12676-9e8d-407a-83b6-a911ff5a7cf8(jetbrains.mps.logic.builtin.java)" />
     <import index="95zw" ref="r:f3ff7852-b9dd-4760-b213-a8a031c77d0e(jetbrains.mps.logic.jchr.predicate)" />
+    <import index="t5kh" ref="r:1514c681-0724-461e-a435-315a6af4b3b4(jetbrains.mps.lang.typesystem2.sampleplugin.plugin)" />
+    <import index="eifs" ref="b984ee52-f34d-4b6d-8812-866c1d3eae31/java:runtime(jetbrains.mps.jchr.runtime/)" />
+    <import index="iawt" ref="b984ee52-f34d-4b6d-8812-866c1d3eae31/java:runtime.debug(jetbrains.mps.jchr.runtime/)" />
+    <import index="t6h5" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.lang.reflect(JDK/)" />
+    <import index="ie8e" ref="r:ab2605ab-b4bc-4e80-a8ca-19a4a8465c01(jetbrains.mps.logic.atom)" />
+    <import index="45ys" ref="r:7365f7fe-12e6-4229-8901-f6dc6d5df03f(jetbrains.mps.logic.reactor.logical)" />
+    <import index="33ny" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util(JDK/)" />
+    <import index="4t1t" ref="r:703839e2-c38f-4b71-8602-72ccb87dd74e(jetbrains.mps.lang.typesystem2.runtime.util)" />
+    <import index="jk6o" ref="r:999d4d33-c34a-4228-9fea-c5d1d293923a(jetbrains.mps.lang.typesystem2.samplechecker.runner)" />
+    <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">
+      <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>
+      <concept id="1082485599095" name="jetbrains.mps.baseLanguage.structure.BlockStatement" flags="nn" index="9aQIb">
+        <child id="1082485599096" name="statements" index="9aQI4" />
+      </concept>
       <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="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="1188207840427" name="jetbrains.mps.baseLanguage.structure.AnnotationInstance" flags="nn" index="2AHcQZ">
         <reference id="1188208074048" name="annotation" index="2AI5Lk" />
       </concept>
@@ -35,6 +58,13 @@
       <concept id="2820489544401957797" name="jetbrains.mps.baseLanguage.structure.DefaultClassCreator" flags="nn" index="HV5vD">
         <reference id="2820489544401957798" name="classifier" index="HV5vE" />
       </concept>
+      <concept id="1224848483129" name="jetbrains.mps.baseLanguage.structure.IBLDeprecatable" flags="ng" index="IEa8$">
+        <property id="1224848525476" name="isDeprecated" index="IEkAT" />
+      </concept>
+      <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
+        <child id="1154032183016" name="body" index="2LFqv$" />
+        <child id="363746191845183793" name="loopLabel" index="3Wmhwa" />
+      </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" />
@@ -42,11 +72,20 @@
       <concept id="1197029447546" name="jetbrains.mps.baseLanguage.structure.FieldReferenceOperation" flags="nn" index="2OwXpG">
         <reference id="1197029500499" name="fieldDeclaration" index="2Oxat5" />
       </concept>
+      <concept id="1164879751025" name="jetbrains.mps.baseLanguage.structure.TryCatchStatement" flags="nn" index="SfApY">
+        <child id="1164879758292" name="body" index="SfCbr" />
+        <child id="1164903496223" name="catchClause" index="TEbGg" />
+      </concept>
       <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
         <child id="1145553007750" name="creator" index="2ShVmc" />
       </concept>
+      <concept id="1164903280175" name="jetbrains.mps.baseLanguage.structure.CatchClause" flags="nn" index="TDmWw">
+        <child id="1164903359218" name="catchBody" index="TDEfX" />
+        <child id="1164903359217" name="throwable" index="TDEfY" />
+      </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>
@@ -61,6 +100,10 @@
         <reference id="1144433057691" name="classifier" index="1PxDUh" />
       </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="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" />
@@ -78,10 +121,14 @@
       </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">
+        <property id="4276006055363816570" name="isSynchronized" index="od$2w" />
+        <property id="1181808852946" name="isFinal" index="DiZV1" />
+        <child id="1164879685961" name="throwsItem" index="Sfmx6" />
         <child id="1068580123133" name="returnType" index="3clF45" />
         <child id="1068580123134" name="parameter" index="3clF46" />
         <child id="1068580123135" name="body" index="3clF47" />
@@ -95,6 +142,7 @@
       </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="1082485599094" name="ifFalseStatement" index="9aQIa" />
         <child id="1068580123160" name="condition" index="3clFbw" />
         <child id="1068580123161" name="ifTrue" index="3clFbx" />
         <child id="1206060520071" name="elsifClauses" index="3eNLev" />
@@ -103,6 +151,13 @@
         <child id="1068581517665" name="statement" index="3cqZAp" />
       </concept>
       <concept id="1068580123140" name="jetbrains.mps.baseLanguage.structure.ConstructorDeclaration" flags="ig" index="3clFbW" />
+      <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="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
       </concept>
@@ -112,6 +167,7 @@
         <child id="1206060619838" name="condition" index="3eO9$A" />
         <child id="1206060644605" name="statementList" index="3eOfB_" />
       </concept>
+      <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" />
@@ -123,6 +179,7 @@
         <property id="521412098689998745" name="nonStatic" index="2bfB8j" />
         <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" />
@@ -132,19 +189,53 @@
         <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="1073239437375" name="jetbrains.mps.baseLanguage.structure.NotEqualsExpression" flags="nn" index="3y3z36" />
+      <concept id="1081855346303" name="jetbrains.mps.baseLanguage.structure.BreakStatement" flags="nn" index="3zACq4">
+        <child id="9056323058805176516" name="loopLabelReference" index="2mV7Oi" />
+      </concept>
+      <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="6329021646629104957" name="jetbrains.mps.baseLanguage.structure.TextCommentPart" flags="nn" index="3SKdUq">
-        <property id="6329021646629104958" name="text" index="3SKdUp" />
+      <concept id="1144226303539" name="jetbrains.mps.baseLanguage.structure.ForeachStatement" flags="nn" index="1DcWWT">
+        <child id="1144226360166" name="iterable" index="1DdaDG" />
       </concept>
-      <concept id="6329021646629104954" name="jetbrains.mps.baseLanguage.structure.SingleLineComment" flags="nn" index="3SKdUt">
-        <child id="6329021646629175155" name="commentPart" index="3SKWNk" />
+      <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="1082113931046" name="jetbrains.mps.baseLanguage.structure.ContinueStatement" flags="nn" index="3N13vt">
+        <child id="9056323058805226429" name="loopLabelReference" index="2mVjTF" />
+      </concept>
+      <concept id="1208890769693" name="jetbrains.mps.baseLanguage.structure.ArrayLengthOperation" flags="nn" index="1Rwk04" />
       <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" />
       <concept id="1146644641414" name="jetbrains.mps.baseLanguage.structure.ProtectedVisibility" flags="nn" index="3Tmbuc" />
+      <concept id="1116615150612" name="jetbrains.mps.baseLanguage.structure.ClassifierClassExpression" flags="nn" index="3VsKOn">
+        <reference id="1116615189566" name="classifier" index="3VsUkX" />
+      </concept>
+      <concept id="363746191845183785" name="jetbrains.mps.baseLanguage.structure.LoopLabelReference" flags="ng" index="3Wmhwi">
+        <reference id="363746191845183786" name="loopLabel" index="3Wmhwh" />
+      </concept>
+      <concept id="363746191845175146" name="jetbrains.mps.baseLanguage.structure.LoopLabel" flags="ng" index="3Wmmph" />
+    </language>
+    <language id="760a0a8c-eabb-4521-8bfd-65db761a9ba3" name="jetbrains.mps.baseLanguage.logging">
+      <concept id="1167227138527" name="jetbrains.mps.baseLanguage.logging.structure.LogStatement" flags="nn" index="34ab3g">
+        <property id="1167228628751" name="hasException" index="34fQS0" />
+        <property id="1167245565795" name="severity" index="35gtTG" />
+        <child id="1167227463056" name="logExpression" index="34bqiv" />
+        <child id="1167227561449" name="exception" index="34bMjA" />
+      </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">
@@ -178,8 +269,8 @@
       <property role="TrG5h" value="create" />
       <node concept="37vLTG" id="7ISVfSIeK_" role="3clF46">
         <property role="TrG5h" value="config" />
-        <node concept="3uibUv" id="7ISVfSIeMU" role="1tU5fm">
-          <ref role="3uigEE" to="rchb:5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
+        <node concept="3uibUv" id="5mr7UHcbD0_" role="1tU5fm">
+          <ref role="3uigEE" node="5mr7UHcbv_1" resolve="JchrEvaluationSession.Config" />
         </node>
       </node>
       <node concept="3uibUv" id="7ISVfSIeJI" role="3clF45">
@@ -202,7 +293,7 @@
                     <ref role="3cqZAo" node="7ISVfSIeK_" resolve="config" />
                   </node>
                   <node concept="liA8E" id="7ISVfSIkAa" role="2OqNvi">
-                    <ref role="37wK5l" to="rchb:7ISVfSIiZn" resolve="getPredicateSymbols" />
+                    <ref role="37wK5l" node="7ISVfSIiZn" resolve="getPredicateSymbols" />
                   </node>
                 </node>
               </node>
@@ -212,6 +303,63 @@
             </node>
           </node>
         </node>
+        <node concept="3clFbH" id="5mr7UHchezJ" role="3cqZAp" />
+        <node concept="3cpWs8" id="5mr7UHcheHc" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcheHd" role="3cpWs9">
+            <property role="TrG5h" value="symbols" />
+            <node concept="3uibUv" id="5mr7UHcheGS" role="1tU5fm">
+              <ref role="3uigEE" node="7ISVfSIxNO" resolve="JchrEvaluationSession.Symbols" />
+            </node>
+            <node concept="2ShNRf" id="5mr7UHcheHe" role="33vP2m">
+              <node concept="1pGfFk" id="5mr7UHcheHf" role="2ShVmc">
+                <ref role="37wK5l" node="5mr7UHch7og" resolve="JchrEvaluationSession.Symbols" />
+                <node concept="37vLTw" id="5mr7UHcheHg" role="37wK5m">
+                  <ref role="3cqZAo" node="7ISVfSIkA5" resolve="csession" />
+                </node>
+                <node concept="2OqwBi" id="5mr7UHcheHh" role="37wK5m">
+                  <node concept="37vLTw" id="5mr7UHcheHi" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7ISVfSIeK_" resolve="config" />
+                  </node>
+                  <node concept="liA8E" id="5mr7UHcheHj" role="2OqNvi">
+                    <ref role="37wK5l" node="5mr7UHcbx7o" resolve="getComputingTracer" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1DcWWT" id="5mr7UHchfPx" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHchfPz" role="2LFqv$">
+            <node concept="3clFbF" id="5mr7UHchebU" role="3cqZAp">
+              <node concept="2OqwBi" id="5mr7UHchg4S" role="3clFbG">
+                <node concept="37vLTw" id="5mr7UHcheHk" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5mr7UHcheHd" resolve="symbols" />
+                </node>
+                <node concept="liA8E" id="5mr7UHchgaR" role="2OqNvi">
+                  <ref role="37wK5l" node="7ISVfSIy6a" resolve="register" />
+                  <node concept="37vLTw" id="5mr7UHchgbS" role="37wK5m">
+                    <ref role="3cqZAo" node="5mr7UHchfP_" resolve="symbol" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWsn" id="5mr7UHchfP_" role="1Duv9x">
+            <property role="TrG5h" value="symbol" />
+            <node concept="3uibUv" id="5mr7UHchfPD" role="1tU5fm">
+              <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+            </node>
+          </node>
+          <node concept="2OqwBi" id="5mr7UHchfPE" role="1DdaDG">
+            <node concept="37vLTw" id="5mr7UHchfPF" role="2Oq$k0">
+              <ref role="3cqZAo" node="7ISVfSIeK_" resolve="config" />
+            </node>
+            <node concept="liA8E" id="5mr7UHchfPG" role="2OqNvi">
+              <ref role="37wK5l" node="7ISVfSIiZn" resolve="getPredicateSymbols" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="5mr7UHch5Ht" role="3cqZAp" />
         <node concept="3clFbF" id="7ISVfSIeOH" role="3cqZAp">
           <node concept="2ShNRf" id="7ISVfSIeOF" role="3clFbG">
             <node concept="1pGfFk" id="7ISVfSIeUk" role="2ShVmc">
@@ -219,6 +367,27 @@
               <node concept="37vLTw" id="7ISVfSIkQC" role="37wK5m">
                 <ref role="3cqZAo" node="7ISVfSIkA5" resolve="csession" />
               </node>
+              <node concept="2OqwBi" id="5mr7UHcc2yc" role="37wK5m">
+                <node concept="2ShNRf" id="5mr7UHcc2yd" role="2Oq$k0">
+                  <node concept="1pGfFk" id="5mr7UHcc2ye" role="2ShVmc">
+                    <ref role="37wK5l" node="5mr7UHcaVkq" resolve="JchrHandlerLauncher" />
+                    <node concept="37vLTw" id="5mr7UHcc2yf" role="37wK5m">
+                      <ref role="3cqZAo" node="7ISVfSIkA5" resolve="csession" />
+                    </node>
+                  </node>
+                </node>
+                <node concept="liA8E" id="5mr7UHcc2yg" role="2OqNvi">
+                  <ref role="37wK5l" node="41ox5VnjL1k" resolve="callTellMain" />
+                  <node concept="2OqwBi" id="5mr7UHcc2yh" role="37wK5m">
+                    <node concept="37vLTw" id="5mr7UHcc2yi" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7ISVfSIeK_" resolve="config" />
+                    </node>
+                    <node concept="liA8E" id="5mr7UHcc2yj" role="2OqNvi">
+                      <ref role="37wK5l" node="5mr7UHcbDLc" resolve="getHandlerClass" />
+                    </node>
+                  </node>
+                </node>
+              </node>
             </node>
           </node>
         </node>
@@ -232,6 +401,12 @@
           <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
         </node>
       </node>
+      <node concept="37vLTG" id="5mr7UHcaZSN" role="3clF46">
+        <property role="TrG5h" value="handler" />
+        <node concept="3uibUv" id="5mr7UHcc2gh" role="1tU5fm">
+          <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+        </node>
+      </node>
       <node concept="3cqZAl" id="7ISVfSIeTm" role="3clF45" />
       <node concept="3Tm6S6" id="7ISVfSIeU_" role="1B3o_S" />
       <node concept="3clFbS" id="7ISVfSIeTo" role="3clF47">
@@ -248,9 +423,21 @@
             </node>
           </node>
         </node>
+        <node concept="3clFbF" id="5mr7UHcc2l0" role="3cqZAp">
+          <node concept="37vLTI" id="5mr7UHcc2rY" role="3clFbG">
+            <node concept="37vLTw" id="5mr7UHcc2ua" role="37vLTx">
+              <ref role="3cqZAo" node="5mr7UHcaZSN" resolve="handler" />
+            </node>
+            <node concept="2OqwBi" id="5mr7UHcc2l2" role="37vLTJ">
+              <node concept="Xjq3P" id="5mr7UHcc2l3" role="2Oq$k0" />
+              <node concept="2OwXpG" id="5mr7UHcc2l4" role="2OqNvi">
+                <ref role="2Oxat5" node="5mr7UHcbWmK" resolve="handler" />
+              </node>
+            </node>
+          </node>
+        </node>
       </node>
     </node>
-    <node concept="2tJIrI" id="7ISVfSIeep" role="jymVt" />
     <node concept="2tJIrI" id="7ISVfSIXEv" role="jymVt" />
     <node concept="3clFb_" id="7ISVfSIXWF" role="jymVt">
       <property role="TrG5h" value="computingTracer" />
@@ -380,19 +567,72 @@
       </node>
       <node concept="3Tm1VV" id="7ISVfSIg3a" role="1B3o_S" />
       <node concept="3clFbS" id="7ISVfSIg3c" role="3clF47">
-        <node concept="3SKdUt" id="7ISVfSIrGX" role="3cqZAp">
-          <node concept="3SKdUq" id="7ISVfSIrGZ" role="3SKWNk">
-            <property role="3SKdUp" value="FIXME: implement me" />
-          </node>
-        </node>
-        <node concept="YS8fn" id="7ISVfSIr$n" role="3cqZAp">
-          <node concept="2ShNRf" id="7ISVfSIr$H" role="YScLw">
-            <node concept="1pGfFk" id="7ISVfSIrEh" role="2ShVmc">
-              <ref role="37wK5l" to="wyt6:~UnsupportedOperationException.&lt;init&gt;(java.lang.String)" resolve="UnsupportedOperationException" />
-              <node concept="Xl_RD" id="7ISVfSIrEN" role="37wK5m">
-                <property role="Xl_RC" value="not implemented" />
+        <node concept="3cpWs8" id="5mr7UHcc3fz" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcc3fD" role="3cpWs9">
+            <property role="TrG5h" value="symbols" />
+            <node concept="3uibUv" id="5mr7UHcc3fF" role="1tU5fm">
+              <ref role="3uigEE" to="33ny:~Set" resolve="Set" />
+              <node concept="3uibUv" id="5mr7UHcc3k_" role="11_B2D">
+                <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
               </node>
             </node>
+            <node concept="2ShNRf" id="5mr7UHcc3pl" role="33vP2m">
+              <node concept="1pGfFk" id="5mr7UHcc3FZ" role="2ShVmc">
+                <ref role="37wK5l" to="33ny:~HashSet.&lt;init&gt;()" resolve="HashSet" />
+                <node concept="3uibUv" id="5mr7UHcc3MO" role="1pMfVU">
+                  <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1DcWWT" id="7FtwPOZH5ZC" role="3cqZAp">
+          <node concept="3clFbS" id="7FtwPOZH5ZD" role="2LFqv$">
+            <node concept="3clFbF" id="5mr7UHcc3Sw" role="3cqZAp">
+              <node concept="2OqwBi" id="5mr7UHcc3Vt" role="3clFbG">
+                <node concept="37vLTw" id="5mr7UHcc3Su" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5mr7UHcc3fD" resolve="symbols" />
+                </node>
+                <node concept="liA8E" id="5mr7UHcc48r" role="2OqNvi">
+                  <ref role="37wK5l" to="33ny:~Set.add(java.lang.Object):boolean" resolve="add" />
+                  <node concept="2ShNRf" id="5mr7UHcc4ap" role="37wK5m">
+                    <node concept="1pGfFk" id="5mr7UHcc4uk" role="2ShVmc">
+                      <ref role="37wK5l" to="qrld:54i3FxcZMv0" resolve="ConstraintSymbol" />
+                      <node concept="2OqwBi" id="5mr7UHcc4xf" role="37wK5m">
+                        <node concept="37vLTw" id="5mr7UHcc4w8" role="2Oq$k0">
+                          <ref role="3cqZAo" node="7FtwPOZH60R" resolve="c" />
+                        </node>
+                        <node concept="liA8E" id="5mr7UHcc4zi" role="2OqNvi">
+                          <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                        </node>
+                      </node>
+                      <node concept="2OqwBi" id="5mr7UHcc4BH" role="37wK5m">
+                        <node concept="37vLTw" id="5mr7UHcc4Ab" role="2Oq$k0">
+                          <ref role="3cqZAo" node="7FtwPOZH60R" resolve="c" />
+                        </node>
+                        <node concept="liA8E" id="5mr7UHcc4Eh" role="2OqNvi">
+                          <ref role="37wK5l" to="eifs:~IConstraint.getArity():int" resolve="getArity" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWsn" id="7FtwPOZH60R" role="1Duv9x">
+            <property role="TrG5h" value="c" />
+            <node concept="3uibUv" id="7FtwPOZH60S" role="1tU5fm">
+              <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+            </node>
+          </node>
+          <node concept="37vLTw" id="7FtwPOZH60T" role="1DdaDG">
+            <ref role="3cqZAo" node="5mr7UHcbWmK" resolve="handler" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="5mr7UHcc4Q1" role="3cqZAp">
+          <node concept="37vLTw" id="5mr7UHcc4PZ" role="3clFbG">
+            <ref role="3cqZAo" node="5mr7UHcc3fD" resolve="symbols" />
           </node>
         </node>
       </node>
@@ -401,6 +641,77 @@
       </node>
     </node>
     <node concept="2tJIrI" id="7ISVfSIi5A" role="jymVt" />
+    <node concept="3clFb_" id="5mr7UHccwFb" role="jymVt">
+      <property role="TrG5h" value="constraintOccurrences" />
+      <property role="1EzhhJ" value="false" />
+      <node concept="3uibUv" id="5mr7UHccwFc" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Iterable" resolve="Iterable" />
+        <node concept="3uibUv" id="5mr7UHccwFd" role="11_B2D">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
+        </node>
+      </node>
+      <node concept="3Tm1VV" id="5mr7UHccwFe" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHccwFg" role="3clF47">
+        <node concept="3cpWs8" id="5mr7UHccyPg" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHccyPh" role="3cpWs9">
+            <property role="TrG5h" value="constraints" />
+            <node concept="3uibUv" id="5mr7UHccyPi" role="1tU5fm">
+              <ref role="3uigEE" to="33ny:~List" resolve="List" />
+              <node concept="3uibUv" id="5mr7UHccyPj" role="11_B2D">
+                <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
+              </node>
+            </node>
+            <node concept="2ShNRf" id="5mr7UHccyPk" role="33vP2m">
+              <node concept="1pGfFk" id="5mr7UHccyPl" role="2ShVmc">
+                <ref role="37wK5l" to="33ny:~ArrayList.&lt;init&gt;()" resolve="ArrayList" />
+                <node concept="3uibUv" id="5mr7UHccyPm" role="1pMfVU">
+                  <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1DcWWT" id="5mr7UHccyPn" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHccyPo" role="2LFqv$">
+            <node concept="3clFbF" id="5mr7UHccyPr" role="3cqZAp">
+              <node concept="2OqwBi" id="5mr7UHccyPs" role="3clFbG">
+                <node concept="37vLTw" id="5mr7UHccyPt" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5mr7UHccyPh" resolve="constraints" />
+                </node>
+                <node concept="liA8E" id="5mr7UHccyPu" role="2OqNvi">
+                  <ref role="37wK5l" to="33ny:~List.add(java.lang.Object):boolean" resolve="add" />
+                  <node concept="2YIFZM" id="5mr7UHccyPv" role="37wK5m">
+                    <ref role="37wK5l" node="5mr7UHcch1k" resolve="fromIConstraint" />
+                    <ref role="1Pybhc" node="5mr7UHccgL$" resolve="JchrConstraint" />
+                    <node concept="37vLTw" id="5mr7UHccyPw" role="37wK5m">
+                      <ref role="3cqZAo" node="5mr7UHccyPD" resolve="c" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWsn" id="5mr7UHccyPD" role="1Duv9x">
+            <property role="TrG5h" value="c" />
+            <node concept="3uibUv" id="5mr7UHccyPE" role="1tU5fm">
+              <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+            </node>
+          </node>
+          <node concept="37vLTw" id="5mr7UHccyPF" role="1DdaDG">
+            <ref role="3cqZAo" node="5mr7UHcbWmK" resolve="handler" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="5mr7UHccyPG" role="3cqZAp">
+          <node concept="37vLTw" id="5mr7UHccyPH" role="3clFbG">
+            <ref role="3cqZAo" node="5mr7UHccyPh" resolve="constraints" />
+          </node>
+        </node>
+      </node>
+      <node concept="2AHcQZ" id="5mr7UHccxm6" role="2AJF6D">
+        <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5mr7UHccxOc" role="jymVt" />
     <node concept="3clFb_" id="7ISVfSIg3f" role="jymVt">
       <property role="TrG5h" value="constraintOccurrences" />
       <property role="1EzhhJ" value="false" />
@@ -418,19 +729,83 @@
       </node>
       <node concept="3Tm1VV" id="7ISVfSIg3k" role="1B3o_S" />
       <node concept="3clFbS" id="7ISVfSIg3m" role="3clF47">
-        <node concept="3SKdUt" id="7ISVfSIrHa" role="3cqZAp">
-          <node concept="3SKdUq" id="7ISVfSIrHb" role="3SKWNk">
-            <property role="3SKdUp" value="FIXME: implement me" />
-          </node>
-        </node>
-        <node concept="YS8fn" id="7ISVfSIrHc" role="3cqZAp">
-          <node concept="2ShNRf" id="7ISVfSIrHd" role="YScLw">
-            <node concept="1pGfFk" id="7ISVfSIrHe" role="2ShVmc">
-              <ref role="37wK5l" to="wyt6:~UnsupportedOperationException.&lt;init&gt;(java.lang.String)" resolve="UnsupportedOperationException" />
-              <node concept="Xl_RD" id="7ISVfSIrHf" role="37wK5m">
-                <property role="Xl_RC" value="not implemented" />
+        <node concept="3cpWs8" id="5mr7UHccmRY" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHccmRZ" role="3cpWs9">
+            <property role="TrG5h" value="constraints" />
+            <node concept="3uibUv" id="5mr7UHccnbd" role="1tU5fm">
+              <ref role="3uigEE" to="33ny:~List" resolve="List" />
+              <node concept="3uibUv" id="5mr7UHccnir" role="11_B2D">
+                <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
               </node>
             </node>
+            <node concept="2ShNRf" id="5mr7UHccmS2" role="33vP2m">
+              <node concept="1pGfFk" id="5mr7UHccnGp" role="2ShVmc">
+                <ref role="37wK5l" to="33ny:~ArrayList.&lt;init&gt;()" resolve="ArrayList" />
+                <node concept="3uibUv" id="5mr7UHccnRy" role="1pMfVU">
+                  <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="1DcWWT" id="5mr7UHccmS5" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHccmS6" role="2LFqv$">
+            <node concept="3clFbJ" id="5mr7UHccrjY" role="3cqZAp">
+              <node concept="3clFbS" id="5mr7UHccrk0" role="3clFbx">
+                <node concept="3clFbF" id="5mr7UHccnZn" role="3cqZAp">
+                  <node concept="2OqwBi" id="5mr7UHcco2_" role="3clFbG">
+                    <node concept="37vLTw" id="5mr7UHccnZm" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5mr7UHccmRZ" resolve="constraints" />
+                    </node>
+                    <node concept="liA8E" id="5mr7UHccohm" role="2OqNvi">
+                      <ref role="37wK5l" to="33ny:~List.add(java.lang.Object):boolean" resolve="add" />
+                      <node concept="2YIFZM" id="5mr7UHcconF" role="37wK5m">
+                        <ref role="37wK5l" node="5mr7UHcch1k" resolve="fromIConstraint" />
+                        <ref role="1Pybhc" node="5mr7UHccgL$" resolve="JchrConstraint" />
+                        <node concept="37vLTw" id="5mr7UHccopL" role="37wK5m">
+                          <ref role="3cqZAo" node="5mr7UHccmSj" resolve="c" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+              <node concept="2OqwBi" id="5mr7UHccrLl" role="3clFbw">
+                <node concept="2OqwBi" id="5mr7UHccrqM" role="2Oq$k0">
+                  <node concept="37vLTw" id="5mr7UHccrom" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7ISVfSIg3g" resolve="symbol" />
+                  </node>
+                  <node concept="liA8E" id="5mr7UHccrtw" role="2OqNvi">
+                    <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
+                  </node>
+                </node>
+                <node concept="liA8E" id="5mr7UHccrSj" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~String.equals(java.lang.Object):boolean" resolve="equals" />
+                  <node concept="2OqwBi" id="5mr7UHccrZL" role="37wK5m">
+                    <node concept="37vLTw" id="5mr7UHccrXk" role="2Oq$k0">
+                      <ref role="3cqZAo" node="5mr7UHccmSj" resolve="c" />
+                    </node>
+                    <node concept="liA8E" id="5mr7UHccs3w" role="2OqNvi">
+                      <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3cpWsn" id="5mr7UHccmSj" role="1Duv9x">
+            <property role="TrG5h" value="c" />
+            <node concept="3uibUv" id="5mr7UHccmSk" role="1tU5fm">
+              <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+            </node>
+          </node>
+          <node concept="37vLTw" id="5mr7UHccmSl" role="1DdaDG">
+            <ref role="3cqZAo" node="5mr7UHcbWmK" resolve="handler" />
+          </node>
+        </node>
+        <node concept="3clFbF" id="5mr7UHccmSm" role="3cqZAp">
+          <node concept="37vLTw" id="5mr7UHccmSn" role="3clFbG">
+            <ref role="3cqZAo" node="5mr7UHccmRZ" resolve="constraints" />
           </node>
         </node>
       </node>
@@ -439,94 +814,199 @@
       </node>
     </node>
     <node concept="2tJIrI" id="7ISVfSIh11" role="jymVt" />
-    <node concept="3clFb_" id="6Kcfpq7Bs88" role="jymVt">
-      <property role="TrG5h" value="registerHandler" />
-      <node concept="37vLTG" id="7ISVfSIOyP" role="3clF46">
-        <property role="TrG5h" value="symbol" />
-        <node concept="3uibUv" id="7ISVfSIOGX" role="1tU5fm">
-          <ref role="3uigEE" to="qrld:5uFPQ7B$mzX" resolve="Symbol" />
+    <node concept="312cEu" id="5mr7UHcbv_1" role="jymVt">
+      <property role="2bfB8j" value="false" />
+      <property role="TrG5h" value="Config" />
+      <node concept="2tJIrI" id="5mr7UHcbw3u" role="jymVt" />
+      <node concept="3clFb_" id="7ISVfSIuSh" role="jymVt">
+        <property role="TrG5h" value="start" />
+        <node concept="3uibUv" id="7ISVfSIv24" role="3clF45">
+          <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
         </node>
-      </node>
-      <node concept="37vLTG" id="6Kcfpq7BtOW" role="3clF46">
-        <property role="TrG5h" value="instructible" />
-        <node concept="3uibUv" id="6Kcfpq7BtZc" role="1tU5fm">
-          <ref role="3uigEE" to="qrld:6Kcfpq7AXVG" resolve="Instructible" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="6Kcfpq7Bs8a" role="3clF45" />
-      <node concept="3Tmbuc" id="6Kcfpq7BskN" role="1B3o_S" />
-      <node concept="3clFbS" id="6Kcfpq7Bs8c" role="3clF47">
-        <node concept="3clFbF" id="6Kcfpq7Bu1B" role="3cqZAp">
-          <node concept="2OqwBi" id="6Kcfpq7Bu22" role="3clFbG">
-            <node concept="37vLTw" id="7ISVfSIOWI" role="2Oq$k0">
-              <ref role="3cqZAo" node="7ISVfSIlkQ" resolve="computingSession" />
-            </node>
-            <node concept="liA8E" id="6Kcfpq7Bu2G" role="2OqNvi">
-              <ref role="37wK5l" to="qrld:6Kcfpq7B2yH" resolve="registerHandler" />
-              <node concept="37vLTw" id="7ISVfSIOLP" role="37wK5m">
-                <ref role="3cqZAo" node="7ISVfSIOyP" resolve="symbol" />
+        <node concept="3Tm1VV" id="7ISVfSIuSk" role="1B3o_S" />
+        <node concept="3clFbS" id="7ISVfSIuSl" role="3clF47">
+          <node concept="3cpWs8" id="7ISVfSIfLo" role="3cqZAp">
+            <node concept="3cpWsn" id="7ISVfSIfLp" role="3cpWs9">
+              <property role="TrG5h" value="session" />
+              <node concept="3uibUv" id="7ISVfSIfLq" role="1tU5fm">
+                <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
               </node>
-              <node concept="37vLTw" id="6Kcfpq7Bu3W" role="37wK5m">
-                <ref role="3cqZAo" node="6Kcfpq7BtOW" resolve="instructible" />
+              <node concept="2OqwBi" id="7ISVfSIfLr" role="33vP2m">
+                <node concept="10M0yZ" id="5mr7UHcbA$d" role="2Oq$k0">
+                  <ref role="1PxDUh" node="7ISVfSIeeZ" resolve="JchrEvaluationSession.Backend" />
+                  <ref role="3cqZAo" node="7ISVfSIeA4" resolve="ourSession" />
+                </node>
+                <node concept="liA8E" id="7ISVfSIfLs" role="2OqNvi">
+                  <ref role="37wK5l" to="wyt6:~ThreadLocal.get():java.lang.Object" resolve="get" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbJ" id="7ISVfSIfLx" role="3cqZAp">
+            <node concept="3clFbS" id="7ISVfSIfLy" role="3clFbx">
+              <node concept="YS8fn" id="7ISVfSIfLz" role="3cqZAp">
+                <node concept="2ShNRf" id="7ISVfSIfL$" role="YScLw">
+                  <node concept="1pGfFk" id="7ISVfSIfL_" role="2ShVmc">
+                    <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
+                    <node concept="Xl_RD" id="7ISVfSIfLA" role="37wK5m">
+                      <property role="Xl_RC" value="session already active" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3y3z36" id="7ISVfSIfPo" role="3clFbw">
+              <node concept="37vLTw" id="7ISVfSIfLD" role="3uHU7B">
+                <ref role="3cqZAo" node="7ISVfSIfLp" resolve="session" />
+              </node>
+              <node concept="10Nm6u" id="7ISVfSIfLC" role="3uHU7w" />
+            </node>
+          </node>
+          <node concept="3clFbH" id="7ISVfSIfKL" role="3cqZAp" />
+          <node concept="3cpWs8" id="7ISVfSIfHb" role="3cqZAp">
+            <node concept="3cpWsn" id="7ISVfSIfHc" role="3cpWs9">
+              <property role="TrG5h" value="newSession" />
+              <node concept="3uibUv" id="7ISVfSIfHa" role="1tU5fm">
+                <ref role="3uigEE" node="7ISVfSIedQ" resolve="JchrEvaluationSession" />
+              </node>
+              <node concept="1rXfSq" id="7ISVfSIfHd" role="33vP2m">
+                <ref role="37wK5l" node="7ISVfSIeIW" resolve="create" />
+                <node concept="Xjq3P" id="5mr7UHcbBii" role="37wK5m" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="7ISVfSIfUX" role="3cqZAp">
+            <node concept="2OqwBi" id="7ISVfSIfXX" role="3clFbG">
+              <node concept="10M0yZ" id="5mr7UHcbA$e" role="2Oq$k0">
+                <ref role="1PxDUh" node="7ISVfSIeeZ" resolve="JchrEvaluationSession.Backend" />
+                <ref role="3cqZAo" node="7ISVfSIeA4" resolve="ourSession" />
+              </node>
+              <node concept="liA8E" id="7ISVfSIfZG" role="2OqNvi">
+                <ref role="37wK5l" to="wyt6:~ThreadLocal.set(java.lang.Object):void" resolve="set" />
+                <node concept="37vLTw" id="7ISVfSIg0Y" role="37wK5m">
+                  <ref role="3cqZAo" node="7ISVfSIfHc" resolve="newSession" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="7ISVfSIfF0" role="3cqZAp">
+            <node concept="37vLTw" id="7ISVfSIfHf" role="3clFbG">
+              <ref role="3cqZAo" node="7ISVfSIfHc" resolve="newSession" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5uFPQ7Bwuj4" role="jymVt" />
+      <node concept="3clFb_" id="7ISVfSIiZn" role="jymVt">
+        <property role="TrG5h" value="getPredicateSymbols" />
+        <node concept="10Q1$e" id="5mr7UHchhag" role="3clF45">
+          <node concept="3uibUv" id="5mr7UHchgVU" role="10Q1$1">
+            <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+          </node>
+        </node>
+        <node concept="3Tmbuc" id="5mr7UHcbwKC" role="1B3o_S" />
+        <node concept="3clFbS" id="7ISVfSIiZr" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHchfE6" role="3cqZAp">
+            <node concept="2YIFZM" id="5mr7UHchfIK" role="3clFbG">
+              <ref role="37wK5l" to="33ny:~Arrays.asList(java.lang.Object...):java.util.List" resolve="asList" />
+              <ref role="1Pybhc" to="33ny:~Arrays" resolve="Arrays" />
+              <node concept="37vLTw" id="5mr7UHchfKW" role="37wK5m">
+                <ref role="3cqZAo" to="rchb:7ISVfSIioQ" resolve="predicateSymbols" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="5mr7UHchhEK" role="3cqZAp">
+            <node concept="37vLTw" id="5mr7UHchhEM" role="3clFbG">
+              <ref role="3cqZAo" to="rchb:7ISVfSIioQ" resolve="predicateSymbols" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="7ISVfSIjE_" role="jymVt" />
+      <node concept="3clFb_" id="5mr7UHcbx7o" role="jymVt">
+        <property role="TrG5h" value="getComputingTracer" />
+        <node concept="3uibUv" id="5mr7UHcbx7p" role="3clF45">
+          <ref role="3uigEE" to="qrld:24Vro6cQnrj" resolve="ComputingTracer" />
+        </node>
+        <node concept="3Tmbuc" id="5mr7UHcbypS" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbx7r" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHcbx7s" role="3cqZAp">
+            <node concept="37vLTw" id="5mr7UHcbx7n" role="3clFbG">
+              <ref role="3cqZAo" to="rchb:5mr7UHcbs2A" resolve="computingTracer" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5mr7UHcbybF" role="jymVt" />
+      <node concept="3clFb_" id="5mr7UHcbx7g" role="jymVt">
+        <property role="TrG5h" value="getParameters" />
+        <node concept="3uibUv" id="5mr7UHcbx7h" role="3clF45">
+          <ref role="3uigEE" to="33ny:~Map" resolve="Map" />
+          <node concept="17QB3L" id="5mr7UHcbx7i" role="11_B2D" />
+          <node concept="3uibUv" id="5mr7UHcbx7j" role="11_B2D">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+        </node>
+        <node concept="3Tmbuc" id="5mr7UHcbyx8" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbx7l" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHcbx7m" role="3cqZAp">
+            <node concept="37vLTw" id="5mr7UHcbx7f" role="3clFbG">
+              <ref role="3cqZAo" to="rchb:5mr7UHcbcAv" resolve="parameters" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5mr7UHcbDBk" role="jymVt" />
+      <node concept="3clFb_" id="5mr7UHcbDLc" role="jymVt">
+        <property role="TrG5h" value="getHandlerClass" />
+        <node concept="3uibUv" id="5mr7UHcbDUV" role="3clF45">
+          <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+          <node concept="3uibUv" id="5mr7UHcbE3a" role="11_B2D">
+            <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+          </node>
+        </node>
+        <node concept="3Tm1VV" id="5mr7UHcbDLf" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbDLg" role="3clF47">
+          <node concept="3cpWs8" id="5mr7UHcbEN7" role="3cqZAp">
+            <node concept="3cpWsn" id="5mr7UHcbEN8" role="3cpWs9">
+              <property role="TrG5h" value="cls" />
+              <node concept="3uibUv" id="5mr7UHcbEN4" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+              </node>
+              <node concept="2OqwBi" id="5mr7UHcbEN9" role="33vP2m">
+                <node concept="37vLTw" id="5mr7UHcbENa" role="2Oq$k0">
+                  <ref role="3cqZAo" to="rchb:5mr7UHcbcAv" resolve="parameters" />
+                </node>
+                <node concept="liA8E" id="5mr7UHcbENb" role="2OqNvi">
+                  <ref role="37wK5l" to="33ny:~Map.get(java.lang.Object):java.lang.Object" resolve="get" />
+                  <node concept="Xl_RD" id="5mr7UHcbENc" role="37wK5m">
+                    <property role="Xl_RC" value="jchr.handler.class" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="5mr7UHcbEo8" role="3cqZAp">
+            <node concept="10QFUN" id="5mr7UHcbEYA" role="3clFbG">
+              <node concept="37vLTw" id="5mr7UHcbEY_" role="10QFUP">
+                <ref role="3cqZAo" node="5mr7UHcbEN8" resolve="cls" />
+              </node>
+              <node concept="3uibUv" id="5mr7UHcbEZ4" role="10QFUM">
+                <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+                <node concept="3uibUv" id="5mr7UHcbF2M" role="11_B2D">
+                  <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+                </node>
               </node>
             </node>
           </node>
         </node>
       </node>
+      <node concept="3Tm1VV" id="5mr7UHcbv_2" role="1B3o_S" />
+      <node concept="3uibUv" id="5mr7UHcbvZ3" role="1zkMxy">
+        <ref role="3uigEE" to="rchb:5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
+      </node>
     </node>
-    <node concept="2tJIrI" id="6Kcfpq7BuLv" role="jymVt" />
-    <node concept="3clFb_" id="6Kcfpq7Buzk" role="jymVt">
-      <property role="TrG5h" value="registerSolver" />
-      <node concept="37vLTG" id="7ISVfSIOZm" role="3clF46">
-        <property role="TrG5h" value="predicateSymbol" />
-        <node concept="3uibUv" id="7ISVfSIPw0" role="1tU5fm">
-          <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
-        </node>
-      </node>
-      <node concept="37vLTG" id="6Kcfpq7Buzn" role="3clF46">
-        <property role="TrG5h" value="queryable" />
-        <node concept="3uibUv" id="6Kcfpq7Bw2C" role="1tU5fm">
-          <ref role="3uigEE" to="qrld:6Kcfpq7AYBh" resolve="Queryable" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="6Kcfpq7Buzp" role="3clF45" />
-      <node concept="3Tmbuc" id="6Kcfpq7Buzq" role="1B3o_S" />
-      <node concept="3clFbS" id="6Kcfpq7Buzr" role="3clF47">
-        <node concept="3clFbF" id="6Kcfpq7Buzs" role="3cqZAp">
-          <node concept="2OqwBi" id="6Kcfpq7Buzt" role="3clFbG">
-            <node concept="37vLTw" id="7ISVfSIPqq" role="2Oq$k0">
-              <ref role="3cqZAo" node="7ISVfSIlkQ" resolve="computingSession" />
-            </node>
-            <node concept="liA8E" id="6Kcfpq7Buzv" role="2OqNvi">
-              <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
-              <node concept="37vLTw" id="7ISVfSIPef" role="37wK5m">
-                <ref role="3cqZAo" node="7ISVfSIOZm" resolve="predicateSymbol" />
-              </node>
-              <node concept="37vLTw" id="6Kcfpq7Buzx" role="37wK5m">
-                <ref role="3cqZAo" node="6Kcfpq7Buzn" resolve="queryable" />
-              </node>
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="4xBopTzylBh" role="3cqZAp">
-          <node concept="2OqwBi" id="4xBopTzylBi" role="3clFbG">
-            <node concept="37vLTw" id="7ISVfSIPtf" role="2Oq$k0">
-              <ref role="3cqZAo" node="7ISVfSIlkQ" resolve="computingSession" />
-            </node>
-            <node concept="liA8E" id="4xBopTzylBk" role="2OqNvi">
-              <ref role="37wK5l" to="qrld:6Kcfpq7B2yH" resolve="registerHandler" />
-              <node concept="37vLTw" id="7ISVfSIPfC" role="37wK5m">
-                <ref role="3cqZAo" node="7ISVfSIOZm" resolve="predicateSymbol" />
-              </node>
-              <node concept="37vLTw" id="4xBopTzylH0" role="37wK5m">
-                <ref role="3cqZAo" node="6Kcfpq7Buzn" resolve="queryable" />
-              </node>
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="7ISVfSIMqr" role="jymVt" />
+    <node concept="2tJIrI" id="5mr7UHcbvhQ" role="jymVt" />
     <node concept="312cEu" id="7ISVfSIeeZ" role="jymVt">
       <property role="2bfB8j" value="false" />
       <property role="TrG5h" value="Backend" />
@@ -606,87 +1086,19 @@
         </node>
       </node>
       <node concept="2tJIrI" id="7ISVfSIexY" role="jymVt" />
-      <node concept="3clFb_" id="7ISVfSIeuJ" role="jymVt">
+      <node concept="3clFb_" id="5mr7UHcbuUQ" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="start" />
-        <node concept="37vLTG" id="7ISVfSIeuK" role="3clF46">
-          <property role="TrG5h" value="config" />
-          <node concept="3uibUv" id="7ISVfSIeuL" role="1tU5fm">
-            <ref role="3uigEE" to="rchb:5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
-          </node>
+        <property role="TrG5h" value="createConfig" />
+        <node concept="3uibUv" id="5mr7UHcbuUR" role="3clF45">
+          <ref role="3uigEE" to="rchb:5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
         </node>
-        <node concept="3uibUv" id="7ISVfSIeuM" role="3clF45">
-          <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
-        </node>
-        <node concept="3Tm1VV" id="7ISVfSIeuN" role="1B3o_S" />
-        <node concept="3clFbS" id="7ISVfSIeuP" role="3clF47">
-          <node concept="3cpWs8" id="7ISVfSIfLo" role="3cqZAp">
-            <node concept="3cpWsn" id="7ISVfSIfLp" role="3cpWs9">
-              <property role="TrG5h" value="session" />
-              <node concept="3uibUv" id="7ISVfSIfLq" role="1tU5fm">
-                <ref role="3uigEE" to="rchb:5uFPQ7BvN_d" resolve="EvaluationSession" />
+        <node concept="3Tm1VV" id="5mr7UHcbuUS" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbuUU" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHcbzBW" role="3cqZAp">
+            <node concept="2ShNRf" id="5mr7UHcbzBU" role="3clFbG">
+              <node concept="HV5vD" id="5mr7UHcbzLn" role="2ShVmc">
+                <ref role="HV5vE" node="5mr7UHcbv_1" resolve="JchrEvaluationSession.Config" />
               </node>
-              <node concept="2OqwBi" id="7ISVfSIfLr" role="33vP2m">
-                <node concept="37vLTw" id="7ISVfSIfLv" role="2Oq$k0">
-                  <ref role="3cqZAo" node="7ISVfSIeA4" resolve="ourSession" />
-                </node>
-                <node concept="liA8E" id="7ISVfSIfLs" role="2OqNvi">
-                  <ref role="37wK5l" to="wyt6:~ThreadLocal.get():java.lang.Object" resolve="get" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbJ" id="7ISVfSIfLx" role="3cqZAp">
-            <node concept="3clFbS" id="7ISVfSIfLy" role="3clFbx">
-              <node concept="YS8fn" id="7ISVfSIfLz" role="3cqZAp">
-                <node concept="2ShNRf" id="7ISVfSIfL$" role="YScLw">
-                  <node concept="1pGfFk" id="7ISVfSIfL_" role="2ShVmc">
-                    <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
-                    <node concept="Xl_RD" id="7ISVfSIfLA" role="37wK5m">
-                      <property role="Xl_RC" value="session already active" />
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="3y3z36" id="7ISVfSIfPo" role="3clFbw">
-              <node concept="37vLTw" id="7ISVfSIfLD" role="3uHU7B">
-                <ref role="3cqZAo" node="7ISVfSIfLp" resolve="session" />
-              </node>
-              <node concept="10Nm6u" id="7ISVfSIfLC" role="3uHU7w" />
-            </node>
-          </node>
-          <node concept="3clFbH" id="7ISVfSIfKL" role="3cqZAp" />
-          <node concept="3cpWs8" id="7ISVfSIfHb" role="3cqZAp">
-            <node concept="3cpWsn" id="7ISVfSIfHc" role="3cpWs9">
-              <property role="TrG5h" value="newSession" />
-              <node concept="3uibUv" id="7ISVfSIfHa" role="1tU5fm">
-                <ref role="3uigEE" node="7ISVfSIedQ" resolve="JchrEvaluationSession" />
-              </node>
-              <node concept="1rXfSq" id="7ISVfSIfHd" role="33vP2m">
-                <ref role="37wK5l" node="7ISVfSIeIW" resolve="create" />
-                <node concept="37vLTw" id="7ISVfSIfHe" role="37wK5m">
-                  <ref role="3cqZAo" node="7ISVfSIeuK" resolve="config" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbF" id="7ISVfSIfUX" role="3cqZAp">
-            <node concept="2OqwBi" id="7ISVfSIfXX" role="3clFbG">
-              <node concept="37vLTw" id="7ISVfSIfUV" role="2Oq$k0">
-                <ref role="3cqZAo" node="7ISVfSIeA4" resolve="ourSession" />
-              </node>
-              <node concept="liA8E" id="7ISVfSIfZG" role="2OqNvi">
-                <ref role="37wK5l" to="wyt6:~ThreadLocal.set(java.lang.Object):void" resolve="set" />
-                <node concept="37vLTw" id="7ISVfSIg0Y" role="37wK5m">
-                  <ref role="3cqZAo" node="7ISVfSIfHc" resolve="newSession" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbF" id="7ISVfSIfF0" role="3cqZAp">
-            <node concept="37vLTw" id="7ISVfSIfHf" role="3clFbG">
-              <ref role="3cqZAo" node="7ISVfSIfHc" resolve="newSession" />
             </node>
           </node>
         </node>
@@ -698,14 +1110,53 @@
       <property role="2bfB8j" value="false" />
       <property role="TrG5h" value="Symbols" />
       <node concept="2tJIrI" id="7ISVfSIy3T" role="jymVt" />
-      <node concept="3clFb_" id="7ISVfSIy6a" role="jymVt">
-        <property role="TrG5h" value="get" />
-        <node concept="37vLTG" id="7ISVfSISyb" role="3clF46">
-          <property role="TrG5h" value="evaluationSession" />
-          <node concept="3uibUv" id="7ISVfSISEz" role="1tU5fm">
-            <ref role="3uigEE" node="7ISVfSIedQ" resolve="JchrEvaluationSession" />
+      <node concept="3clFbW" id="5mr7UHch7og" role="jymVt">
+        <node concept="3cqZAl" id="5mr7UHch7oi" role="3clF45" />
+        <node concept="3Tm1VV" id="5mr7UHch7oj" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHch7ok" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHch7DZ" role="3cqZAp">
+            <node concept="37vLTI" id="5mr7UHch7E1" role="3clFbG">
+              <node concept="2OqwBi" id="5mr7UHch7E5" role="37vLTJ">
+                <node concept="Xjq3P" id="5mr7UHch7E8" role="2Oq$k0" />
+                <node concept="2OwXpG" id="5mr7UHch9IB" role="2OqNvi">
+                  <ref role="2Oxat5" node="5mr7UHch7DV" resolve="computingSession" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="5mr7UHch7E9" role="37vLTx">
+                <ref role="3cqZAo" node="5mr7UHch7vp" resolve="computingSession" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="5mr7UHchbUd" role="3cqZAp">
+            <node concept="37vLTI" id="5mr7UHchbUf" role="3clFbG">
+              <node concept="2OqwBi" id="5mr7UHchbUj" role="37vLTJ">
+                <node concept="Xjq3P" id="5mr7UHchbUm" role="2Oq$k0" />
+                <node concept="2OwXpG" id="5mr7UHchbUi" role="2OqNvi">
+                  <ref role="2Oxat5" node="5mr7UHchbU9" resolve="computingTracer" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="5mr7UHchbUn" role="37vLTx">
+                <ref role="3cqZAo" node="5mr7UHchb$f" resolve="computingTracer" />
+              </node>
+            </node>
           </node>
         </node>
+        <node concept="37vLTG" id="5mr7UHch7vp" role="3clF46">
+          <property role="TrG5h" value="computingSession" />
+          <node concept="3uibUv" id="5mr7UHch7vo" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
+          </node>
+        </node>
+        <node concept="37vLTG" id="5mr7UHchb$f" role="3clF46">
+          <property role="TrG5h" value="computingTracer" />
+          <node concept="3uibUv" id="5mr7UHchbC8" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:24Vro6cQnrj" resolve="ComputingTracer" />
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5mr7UHch7zp" role="jymVt" />
+      <node concept="3clFb_" id="7ISVfSIy6a" role="jymVt">
+        <property role="TrG5h" value="register" />
         <node concept="37vLTG" id="7ISVfSIJee" role="3clF46">
           <property role="TrG5h" value="symbol" />
           <node concept="3uibUv" id="7ISVfSIJhR" role="1tU5fm">
@@ -713,7 +1164,7 @@
           </node>
         </node>
         <node concept="3cqZAl" id="7ISVfSIy6c" role="3clF45" />
-        <node concept="3Tm1VV" id="7ISVfSIy6d" role="1B3o_S" />
+        <node concept="3Tmbuc" id="5mr7UHchdZc" role="1B3o_S" />
         <node concept="3clFbS" id="7ISVfSIy6e" role="3clF47">
           <node concept="3clFbH" id="7ISVfSIYKv" role="3cqZAp" />
           <node concept="3clFbJ" id="7ISVfSIIXN" role="3cqZAp">
@@ -721,10 +1172,10 @@
               <node concept="3clFbF" id="7ISVfSIVrg" role="3cqZAp">
                 <node concept="2OqwBi" id="7ISVfSIVrQ" role="3clFbG">
                   <node concept="37vLTw" id="7ISVfSIVrf" role="2Oq$k0">
-                    <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
+                    <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                   </node>
                   <node concept="liA8E" id="7ISVfSIVsU" role="2OqNvi">
-                    <ref role="37wK5l" node="6Kcfpq7Buzk" resolve="registerSolver" />
+                    <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
                     <node concept="10QFUN" id="7ISVfSIYFl" role="37wK5m">
                       <node concept="3uibUv" id="7ISVfSIYFj" role="10QFUM">
                         <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
@@ -736,21 +1187,11 @@
                     <node concept="2ShNRf" id="7ISVfSIVIp" role="37wK5m">
                       <node concept="1pGfFk" id="7ISVfSIWk9" role="2ShVmc">
                         <ref role="37wK5l" to="95zw:3HJTsBn5KhD" resolve="UnificationSolverImpl" />
-                        <node concept="2OqwBi" id="7ISVfSIWne" role="37wK5m">
-                          <node concept="37vLTw" id="7ISVfSIWm5" role="2Oq$k0">
-                            <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
-                          </node>
-                          <node concept="liA8E" id="7ISVfSIWoU" role="2OqNvi">
-                            <ref role="37wK5l" node="7ISVfSIg2_" resolve="computingSession" />
-                          </node>
+                        <node concept="37vLTw" id="5mr7UHchbwX" role="37wK5m">
+                          <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                         </node>
-                        <node concept="2OqwBi" id="7ISVfSIY_8" role="37wK5m">
-                          <node concept="37vLTw" id="7ISVfSIYzH" role="2Oq$k0">
-                            <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
-                          </node>
-                          <node concept="liA8E" id="7ISVfSIYB7" role="2OqNvi">
-                            <ref role="37wK5l" node="7ISVfSIXWF" resolve="computingTracer" />
-                          </node>
+                        <node concept="37vLTw" id="5mr7UHchcsc" role="37wK5m">
+                          <ref role="3cqZAo" node="5mr7UHchbU9" resolve="computingTracer" />
                         </node>
                       </node>
                     </node>
@@ -788,10 +1229,10 @@
                 <node concept="3clFbF" id="7ISVfSIYOv" role="3cqZAp">
                   <node concept="2OqwBi" id="7ISVfSIYOw" role="3clFbG">
                     <node concept="37vLTw" id="7ISVfSIYOx" role="2Oq$k0">
-                      <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
+                      <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                     </node>
                     <node concept="liA8E" id="7ISVfSIYOy" role="2OqNvi">
-                      <ref role="37wK5l" node="6Kcfpq7Buzk" resolve="registerSolver" />
+                      <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
                       <node concept="10QFUN" id="7ISVfSIYOz" role="37wK5m">
                         <node concept="3uibUv" id="7ISVfSIYO$" role="10QFUM">
                           <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
@@ -803,13 +1244,8 @@
                       <node concept="2ShNRf" id="7ISVfSIYOA" role="37wK5m">
                         <node concept="1pGfFk" id="7ISVfSIYOB" role="2ShVmc">
                           <ref role="37wK5l" to="95zw:3HJTsBn5dl7" resolve="EqualsSolverImpl" />
-                          <node concept="2OqwBi" id="7ISVfSIYOC" role="37wK5m">
-                            <node concept="37vLTw" id="7ISVfSIYOD" role="2Oq$k0">
-                              <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
-                            </node>
-                            <node concept="liA8E" id="7ISVfSIYOE" role="2OqNvi">
-                              <ref role="37wK5l" node="7ISVfSIg2_" resolve="computingSession" />
-                            </node>
+                          <node concept="37vLTw" id="7ISVfSIYOD" role="37wK5m">
+                            <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                           </node>
                         </node>
                       </node>
@@ -836,10 +1272,10 @@
                 <node concept="3clFbF" id="7ISVfSIZhm" role="3cqZAp">
                   <node concept="2OqwBi" id="7ISVfSIZhn" role="3clFbG">
                     <node concept="37vLTw" id="7ISVfSIZho" role="2Oq$k0">
-                      <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
+                      <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                     </node>
                     <node concept="liA8E" id="7ISVfSIZhp" role="2OqNvi">
-                      <ref role="37wK5l" node="6Kcfpq7Buzk" resolve="registerSolver" />
+                      <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
                       <node concept="10QFUN" id="7ISVfSIZhq" role="37wK5m">
                         <node concept="3uibUv" id="7ISVfSIZhr" role="10QFUM">
                           <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
@@ -876,10 +1312,10 @@
                 <node concept="3clFbF" id="7ISVfSJ2P6" role="3cqZAp">
                   <node concept="2OqwBi" id="7ISVfSJ2P7" role="3clFbG">
                     <node concept="37vLTw" id="7ISVfSJ2P8" role="2Oq$k0">
-                      <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
+                      <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                     </node>
                     <node concept="liA8E" id="7ISVfSJ2P9" role="2OqNvi">
-                      <ref role="37wK5l" node="6Kcfpq7Buzk" resolve="registerSolver" />
+                      <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
                       <node concept="10QFUN" id="7ISVfSJ2Pa" role="37wK5m">
                         <node concept="3uibUv" id="7ISVfSJ2Pb" role="10QFUM">
                           <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
@@ -916,10 +1352,10 @@
                 <node concept="3clFbF" id="7ISVfSJ30n" role="3cqZAp">
                   <node concept="2OqwBi" id="7ISVfSJ30o" role="3clFbG">
                     <node concept="37vLTw" id="7ISVfSJ30p" role="2Oq$k0">
-                      <ref role="3cqZAo" node="7ISVfSISyb" resolve="evaluationSession" />
+                      <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
                     </node>
                     <node concept="liA8E" id="7ISVfSJ30q" role="2OqNvi">
-                      <ref role="37wK5l" node="6Kcfpq7Buzk" resolve="registerSolver" />
+                      <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
                       <node concept="10QFUN" id="7ISVfSJ30r" role="37wK5m">
                         <node concept="3uibUv" id="7ISVfSJ30s" role="10QFUM">
                           <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
@@ -939,12 +1375,135 @@
                 <node concept="3clFbH" id="7ISVfSJ2Nu" role="3cqZAp" />
               </node>
             </node>
+            <node concept="9aQIb" id="5mr7UHchgcy" role="9aQIa">
+              <node concept="3clFbS" id="5mr7UHchgcz" role="9aQI4">
+                <node concept="YS8fn" id="5mr7UHchgjZ" role="3cqZAp">
+                  <node concept="2ShNRf" id="5mr7UHchgme" role="YScLw">
+                    <node concept="1pGfFk" id="5mr7UHchgDA" role="2ShVmc">
+                      <ref role="37wK5l" to="wyt6:~IllegalArgumentException.&lt;init&gt;(java.lang.String)" resolve="IllegalArgumentException" />
+                      <node concept="3cpWs3" id="5mr7UHchgIt" role="37wK5m">
+                        <node concept="37vLTw" id="5mr7UHchgKN" role="3uHU7w">
+                          <ref role="3cqZAo" node="7ISVfSIJee" resolve="symbol" />
+                        </node>
+                        <node concept="Xl_RD" id="5mr7UHchgEB" role="3uHU7B">
+                          <property role="Xl_RC" value="unknown symbol: " />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
           </node>
-          <node concept="3clFbH" id="7ISVfSJ3e6" role="3cqZAp" />
+          <node concept="3clFbH" id="5mr7UHcbFmH" role="3cqZAp" />
         </node>
       </node>
+      <node concept="2tJIrI" id="5mr7UHch7aO" role="jymVt" />
+      <node concept="3clFb_" id="6Kcfpq7Bs88" role="jymVt">
+        <property role="TrG5h" value="registerHandler" />
+        <node concept="37vLTG" id="7ISVfSIOyP" role="3clF46">
+          <property role="TrG5h" value="symbol" />
+          <node concept="3uibUv" id="7ISVfSIOGX" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:5uFPQ7B$mzX" resolve="Symbol" />
+          </node>
+        </node>
+        <node concept="37vLTG" id="6Kcfpq7BtOW" role="3clF46">
+          <property role="TrG5h" value="instructible" />
+          <node concept="3uibUv" id="6Kcfpq7BtZc" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:6Kcfpq7AXVG" resolve="Instructible" />
+          </node>
+        </node>
+        <node concept="3cqZAl" id="6Kcfpq7Bs8a" role="3clF45" />
+        <node concept="3Tmbuc" id="6Kcfpq7BskN" role="1B3o_S" />
+        <node concept="3clFbS" id="6Kcfpq7Bs8c" role="3clF47">
+          <node concept="3clFbF" id="6Kcfpq7Bu1B" role="3cqZAp">
+            <node concept="2OqwBi" id="6Kcfpq7Bu22" role="3clFbG">
+              <node concept="37vLTw" id="7ISVfSIOWI" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
+              </node>
+              <node concept="liA8E" id="6Kcfpq7Bu2G" role="2OqNvi">
+                <ref role="37wK5l" to="qrld:6Kcfpq7B2yH" resolve="registerHandler" />
+                <node concept="37vLTw" id="7ISVfSIOLP" role="37wK5m">
+                  <ref role="3cqZAo" node="7ISVfSIOyP" resolve="symbol" />
+                </node>
+                <node concept="37vLTw" id="6Kcfpq7Bu3W" role="37wK5m">
+                  <ref role="3cqZAo" node="6Kcfpq7BtOW" resolve="instructible" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="6Kcfpq7BuLv" role="jymVt" />
+      <node concept="3clFb_" id="6Kcfpq7Buzk" role="jymVt">
+        <property role="TrG5h" value="registerSolver" />
+        <node concept="37vLTG" id="7ISVfSIOZm" role="3clF46">
+          <property role="TrG5h" value="predicateSymbol" />
+          <node concept="3uibUv" id="7ISVfSIPw0" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
+          </node>
+        </node>
+        <node concept="37vLTG" id="6Kcfpq7Buzn" role="3clF46">
+          <property role="TrG5h" value="queryable" />
+          <node concept="3uibUv" id="6Kcfpq7Bw2C" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:6Kcfpq7AYBh" resolve="Queryable" />
+          </node>
+        </node>
+        <node concept="3cqZAl" id="6Kcfpq7Buzp" role="3clF45" />
+        <node concept="3Tmbuc" id="6Kcfpq7Buzq" role="1B3o_S" />
+        <node concept="3clFbS" id="6Kcfpq7Buzr" role="3clF47">
+          <node concept="3clFbF" id="6Kcfpq7Buzs" role="3cqZAp">
+            <node concept="2OqwBi" id="6Kcfpq7Buzt" role="3clFbG">
+              <node concept="37vLTw" id="7ISVfSIPqq" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
+              </node>
+              <node concept="liA8E" id="6Kcfpq7Buzv" role="2OqNvi">
+                <ref role="37wK5l" to="qrld:6Kcfpq7B2LV" resolve="registerSolver" />
+                <node concept="37vLTw" id="7ISVfSIPef" role="37wK5m">
+                  <ref role="3cqZAo" node="7ISVfSIOZm" resolve="predicateSymbol" />
+                </node>
+                <node concept="37vLTw" id="6Kcfpq7Buzx" role="37wK5m">
+                  <ref role="3cqZAo" node="6Kcfpq7Buzn" resolve="queryable" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="4xBopTzylBh" role="3cqZAp">
+            <node concept="2OqwBi" id="4xBopTzylBi" role="3clFbG">
+              <node concept="37vLTw" id="7ISVfSIPtf" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHch7DV" resolve="computingSession" />
+              </node>
+              <node concept="liA8E" id="4xBopTzylBk" role="2OqNvi">
+                <ref role="37wK5l" to="qrld:6Kcfpq7B2yH" resolve="registerHandler" />
+                <node concept="37vLTw" id="7ISVfSIPfC" role="37wK5m">
+                  <ref role="3cqZAo" node="7ISVfSIOZm" resolve="predicateSymbol" />
+                </node>
+                <node concept="37vLTw" id="4xBopTzylH0" role="37wK5m">
+                  <ref role="3cqZAo" node="6Kcfpq7Buzn" resolve="queryable" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5uFPQ7BZbUe" role="jymVt" />
       <node concept="2tJIrI" id="7ISVfSIy3Y" role="jymVt" />
-      <node concept="3Tm1VV" id="7ISVfSIxNP" role="1B3o_S" />
+      <node concept="3Tm6S6" id="5mr7UHchbHJ" role="1B3o_S" />
+      <node concept="312cEg" id="5mr7UHch7DV" role="jymVt">
+        <property role="TrG5h" value="computingSession" />
+        <node concept="3Tm6S6" id="5mr7UHch7DW" role="1B3o_S" />
+        <node concept="3uibUv" id="5mr7UHch7DY" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5mr7UHchpFD" role="jymVt" />
+      <node concept="312cEg" id="5mr7UHchbU9" role="jymVt">
+        <property role="TrG5h" value="computingTracer" />
+        <node concept="3Tm6S6" id="5mr7UHchbUa" role="1B3o_S" />
+        <node concept="3uibUv" id="5mr7UHchbUc" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:24Vro6cQnrj" resolve="ComputingTracer" />
+        </node>
+      </node>
     </node>
     <node concept="2tJIrI" id="7ISVfSIszY" role="jymVt" />
     <node concept="3Tm1VV" id="7ISVfSIedR" role="1B3o_S" />
@@ -958,6 +1517,674 @@
         <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
       </node>
     </node>
+    <node concept="2tJIrI" id="5mr7UHchoS7" role="jymVt" />
+    <node concept="312cEg" id="5mr7UHcbWmK" role="jymVt">
+      <property role="TrG5h" value="handler" />
+      <node concept="3Tm6S6" id="5mr7UHcbWmI" role="1B3o_S" />
+      <node concept="3uibUv" id="5mr7UHcbWmJ" role="1tU5fm">
+        <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+      </node>
+    </node>
+  </node>
+  <node concept="312cEu" id="5mr7UHcaKkG">
+    <property role="TrG5h" value="JchrHandlerLauncher" />
+    <node concept="2tJIrI" id="5mr7UHcaKlB" role="jymVt" />
+    <node concept="3clFbW" id="5mr7UHcaVkq" role="jymVt">
+      <node concept="3cqZAl" id="5mr7UHcaVks" role="3clF45" />
+      <node concept="3Tm1VV" id="5mr7UHcaVkt" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHcaVku" role="3clF47">
+        <node concept="3clFbF" id="5mr7UHcaVDs" role="3cqZAp">
+          <node concept="37vLTI" id="5mr7UHcaVDu" role="3clFbG">
+            <node concept="2OqwBi" id="5mr7UHcaVDy" role="37vLTJ">
+              <node concept="Xjq3P" id="5mr7UHcaVD_" role="2Oq$k0" />
+              <node concept="2OwXpG" id="5mr7UHcaVDx" role="2OqNvi">
+                <ref role="2Oxat5" node="5mr7UHcaVDo" resolve="computingSession" />
+              </node>
+            </node>
+            <node concept="37vLTw" id="5mr7UHcaVDA" role="37vLTx">
+              <ref role="3cqZAo" node="5mr7UHcaVA5" resolve="computingSession" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="37vLTG" id="5mr7UHcaVA5" role="3clF46">
+        <property role="TrG5h" value="computingSession" />
+        <node concept="3uibUv" id="5mr7UHcaVA4" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5mr7UHcaV2Z" role="jymVt" />
+    <node concept="3clFb_" id="41ox5VnjL1k" role="jymVt">
+      <property role="TrG5h" value="callTellMain" />
+      <property role="IEkAT" value="false" />
+      <property role="DiZV1" value="false" />
+      <property role="od$2w" value="false" />
+      <node concept="3clFbS" id="41ox5VndW1m" role="3clF47">
+        <node concept="3clFbH" id="41ox5Vne48y" role="3cqZAp" />
+        <node concept="3cpWs8" id="41ox5Vneaba" role="3cqZAp">
+          <node concept="3cpWsn" id="41ox5Vneabb" role="3cpWs9">
+            <property role="TrG5h" value="handler" />
+            <node concept="3uibUv" id="41ox5VneaaN" role="1tU5fm">
+              <ref role="3uigEE" to="eifs:~Handler" resolve="Handler" />
+            </node>
+            <node concept="10Nm6u" id="5mr7UHcbUIe" role="33vP2m" />
+          </node>
+        </node>
+        <node concept="3cpWs8" id="41ox5VneSgB" role="3cqZAp">
+          <node concept="3cpWsn" id="41ox5VneSgC" role="3cpWs9">
+            <property role="TrG5h" value="exception" />
+            <node concept="3uibUv" id="41ox5VneSyK" role="1tU5fm">
+              <ref role="3uigEE" to="wyt6:~Throwable" resolve="Throwable" />
+            </node>
+          </node>
+        </node>
+        <node concept="SfApY" id="41ox5Vne9Fa" role="3cqZAp">
+          <node concept="3clFbS" id="41ox5Vne9Fb" role="SfCbr">
+            <node concept="3clFbF" id="5mr7UHcbT3h" role="3cqZAp">
+              <node concept="37vLTI" id="5mr7UHcbT3j" role="3clFbG">
+                <node concept="1rXfSq" id="41ox5Vneabc" role="37vLTx">
+                  <ref role="37wK5l" node="41ox5Vnkagy" resolve="createHandler" />
+                  <node concept="37vLTw" id="41ox5Vneabd" role="37wK5m">
+                    <ref role="3cqZAo" node="41ox5Vne69N" resolve="handlerCls" />
+                  </node>
+                  <node concept="37vLTw" id="5mr7UHcaYlQ" role="37wK5m">
+                    <ref role="3cqZAo" node="5mr7UHcaVDo" resolve="computingSession" />
+                  </node>
+                </node>
+                <node concept="37vLTw" id="5mr7UHcbT3n" role="37vLTJ">
+                  <ref role="3cqZAo" node="41ox5Vneabb" resolve="handler" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbH" id="41ox5VndSdC" role="3cqZAp" />
+            <node concept="3cpWs8" id="41ox5VndUbJ" role="3cqZAp">
+              <node concept="3cpWsn" id="41ox5VndUbK" role="3cpWs9">
+                <property role="TrG5h" value="tellMeth" />
+                <node concept="3uibUv" id="41ox5VndUbE" role="1tU5fm">
+                  <ref role="3uigEE" to="t6h5:~Method" resolve="Method" />
+                </node>
+                <node concept="2OqwBi" id="41ox5VndUbL" role="33vP2m">
+                  <node concept="37vLTw" id="41ox5VndUbM" role="2Oq$k0">
+                    <ref role="3cqZAo" node="41ox5Vne69N" resolve="handlerCls" />
+                  </node>
+                  <node concept="liA8E" id="41ox5VndUbN" role="2OqNvi">
+                    <ref role="37wK5l" to="wyt6:~Class.getMethod(java.lang.String,java.lang.Class...):java.lang.reflect.Method" resolve="getMethod" />
+                    <node concept="Xl_RD" id="41ox5VndUbO" role="37wK5m">
+                      <property role="Xl_RC" value="tellMain" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbF" id="41ox5VndSwj" role="3cqZAp">
+              <node concept="2OqwBi" id="41ox5VndULY" role="3clFbG">
+                <node concept="37vLTw" id="41ox5VndUbQ" role="2Oq$k0">
+                  <ref role="3cqZAo" node="41ox5VndUbK" resolve="tellMeth" />
+                </node>
+                <node concept="liA8E" id="41ox5VndUV7" role="2OqNvi">
+                  <ref role="37wK5l" to="t6h5:~Method.invoke(java.lang.Object,java.lang.Object...):java.lang.Object" resolve="invoke" />
+                  <node concept="37vLTw" id="41ox5VndUYO" role="37wK5m">
+                    <ref role="3cqZAo" node="41ox5Vneabb" resolve="handler" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbH" id="41ox5VneDLS" role="3cqZAp" />
+            <node concept="3cpWs6" id="41ox5VneE6i" role="3cqZAp">
+              <node concept="37vLTw" id="41ox5VneEiF" role="3cqZAk">
+                <ref role="3cqZAo" node="41ox5Vneabb" resolve="handler" />
+              </node>
+            </node>
+            <node concept="3clFbH" id="41ox5Vne9PM" role="3cqZAp" />
+          </node>
+          <node concept="TDmWw" id="41ox5Vnee8L" role="TEbGg">
+            <node concept="3clFbS" id="41ox5Vnee8M" role="TDEfX">
+              <node concept="3clFbF" id="41ox5VneSFr" role="3cqZAp">
+                <node concept="37vLTI" id="41ox5VneSFt" role="3clFbG">
+                  <node concept="37vLTw" id="41ox5VneSgD" role="37vLTx">
+                    <ref role="3cqZAo" node="41ox5Vnee8N" resolve="e" />
+                  </node>
+                  <node concept="37vLTw" id="41ox5VneSFx" role="37vLTJ">
+                    <ref role="3cqZAo" node="41ox5VneSgC" resolve="exception" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3cpWsn" id="41ox5Vnee8N" role="TDEfY">
+              <property role="TrG5h" value="e" />
+              <node concept="3uibUv" id="41ox5Vnee8O" role="1tU5fm">
+                <ref role="3uigEE" to="t6h5:~InvocationTargetException" resolve="InvocationTargetException" />
+              </node>
+            </node>
+          </node>
+          <node concept="TDmWw" id="41ox5Vnee8P" role="TEbGg">
+            <node concept="3clFbS" id="41ox5Vnee8Q" role="TDEfX">
+              <node concept="3clFbF" id="41ox5VneTHA" role="3cqZAp">
+                <node concept="37vLTI" id="41ox5VneTHB" role="3clFbG">
+                  <node concept="37vLTw" id="41ox5VneTHC" role="37vLTx">
+                    <ref role="3cqZAo" node="41ox5Vnee8R" resolve="e" />
+                  </node>
+                  <node concept="37vLTw" id="41ox5VneTHD" role="37vLTJ">
+                    <ref role="3cqZAo" node="41ox5VneSgC" resolve="exception" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3cpWsn" id="41ox5Vnee8R" role="TDEfY">
+              <property role="TrG5h" value="e" />
+              <node concept="3uibUv" id="41ox5Vnee8S" role="1tU5fm">
+                <ref role="3uigEE" to="wyt6:~IllegalAccessException" resolve="IllegalAccessException" />
+              </node>
+            </node>
+          </node>
+          <node concept="TDmWw" id="41ox5Vneg1h" role="TEbGg">
+            <node concept="3clFbS" id="41ox5Vneg1i" role="TDEfX">
+              <node concept="3clFbF" id="41ox5VneTS8" role="3cqZAp">
+                <node concept="37vLTI" id="41ox5VneTS9" role="3clFbG">
+                  <node concept="37vLTw" id="41ox5VneTSa" role="37vLTx">
+                    <ref role="3cqZAo" node="41ox5Vneg1j" resolve="e" />
+                  </node>
+                  <node concept="37vLTw" id="41ox5VneTSb" role="37vLTJ">
+                    <ref role="3cqZAo" node="41ox5VneSgC" resolve="exception" />
+                  </node>
+                </node>
+              </node>
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+    <node concept="3Tm1VV" id="5mr7UHcaKkH" role="1B3o_S" />
+    <node concept="312cEg" id="5mr7UHcaVDo" role="jymVt">
+      <property role="TrG5h" value="computingSession" />
+      <node concept="3Tm6S6" id="5mr7UHcaVDp" role="1B3o_S" />
+      <node concept="3uibUv" id="5mr7UHcaVDr" role="1tU5fm">
+        <ref role="3uigEE" to="qrld:6Kcfpq7B0b0" resolve="ComputingSession" />
+      </node>
+    </node>
+  </node>
+  <node concept="312cEu" id="5mr7UHccgL$">
+    <property role="TrG5h" value="JchrConstraint" />
+    <node concept="2tJIrI" id="5mr7UHccgN0" role="jymVt" />
+    <node concept="2YIFZL" id="5mr7UHcch1k" role="jymVt">
+      <property role="TrG5h" value="fromIConstraint" />
+      <node concept="37vLTG" id="5mr7UHcch4f" role="3clF46">
+        <property role="TrG5h" value="c" />
+        <node concept="3uibUv" id="5mr7UHcch58" role="1tU5fm">
+          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        </node>
+      </node>
+      <node concept="3uibUv" id="5mr7UHcch3c" role="3clF45">
+        <ref role="3uigEE" node="5mr7UHccgL$" resolve="JchrConstraint" />
+      </node>
+      <node concept="3Tm1VV" id="5mr7UHcch1n" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHcch1o" role="3clF47">
+        <node concept="3cpWs8" id="5mr7UHcchxg" role="3cqZAp">
+          <node concept="3cpWsn" id="5mr7UHcchxh" role="3cpWs9">
+            <property role="TrG5h" value="symbol" />
+            <node concept="3uibUv" id="5mr7UHcchxd" role="1tU5fm">
+              <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
+            </node>
+            <node concept="2ShNRf" id="5mr7UHcchxi" role="33vP2m">
+              <node concept="1pGfFk" id="5mr7UHcchxj" role="2ShVmc">
+                <ref role="37wK5l" to="qrld:54i3FxcZMv0" resolve="ConstraintSymbol" />
+                <node concept="2OqwBi" id="5mr7UHcchxk" role="37wK5m">
+                  <node concept="37vLTw" id="5mr7UHcchxl" role="2Oq$k0">
+                    <ref role="3cqZAo" node="5mr7UHcch4f" resolve="c" />
+                  </node>
+                  <node concept="liA8E" id="5mr7UHcchxm" role="2OqNvi">
+                    <ref role="37wK5l" to="eifs:~IConstraint.getIdentifier():java.lang.String" resolve="getIdentifier" />
+                  </node>
+                </node>
+                <node concept="2OqwBi" id="5mr7UHcchxn" role="37wK5m">
+                  <node concept="37vLTw" id="5mr7UHcchxo" role="2Oq$k0">
+                    <ref role="3cqZAo" node="5mr7UHcch4f" resolve="c" />
+                  </node>
+                  <node concept="liA8E" id="5mr7UHcchxp" role="2OqNvi">
+                    <ref role="37wK5l" to="eifs:~IConstraint.getArity():int" resolve="getArity" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="5mr7UHcch6z" role="3cqZAp">
+          <node concept="2ShNRf" id="5mr7UHcch6x" role="3clFbG">
+            <node concept="1pGfFk" id="5mr7UHcchgc" role="2ShVmc">
+              <ref role="37wK5l" node="5mr7UHccgNr" resolve="JchrConstraint" />
+              <node concept="37vLTw" id="5mr7UHcchxq" role="37wK5m">
+                <ref role="3cqZAo" node="5mr7UHcchxh" resolve="symbol" />
+              </node>
+              <node concept="2OqwBi" id="5mr7UHcch_v" role="37wK5m">
+                <node concept="37vLTw" id="5mr7UHcch$$" role="2Oq$k0">
+                  <ref role="3cqZAo" node="5mr7UHcch4f" resolve="c" />
+                </node>
+                <node concept="liA8E" id="5mr7UHcchCx" role="2OqNvi">
+                  <ref role="37wK5l" to="eifs:~IConstraint.getArgumentTypes():java.lang.Class[]" resolve="getArgumentTypes" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5mr7UHccgZA" role="jymVt" />
+    <node concept="3clFbW" id="5mr7UHccgNr" role="jymVt">
+      <node concept="37vLTG" id="5mr7UHccgR4" role="3clF46">
+        <property role="TrG5h" value="constraintSymbol" />
+        <node concept="3uibUv" id="5mr7UHccgRZ" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
+        </node>
+      </node>
+      <node concept="37vLTG" id="5mr7UHccgSi" role="3clF46">
+        <property role="TrG5h" value="args" />
+        <node concept="8X2XB" id="5mr7UHccgTz" role="1tU5fm">
+          <node concept="3uibUv" id="5mr7UHccgSX" role="8Xvag">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+        </node>
+      </node>
+      <node concept="3cqZAl" id="5mr7UHccgNt" role="3clF45" />
+      <node concept="3Tm1VV" id="5mr7UHccgNu" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHccgNv" role="3clF47">
+        <node concept="XkiVB" id="5mr7UHccgQU" role="3cqZAp">
+          <ref role="37wK5l" to="qrld:5uFPQ7BZtsU" resolve="AbstractConstraint" />
+          <node concept="37vLTw" id="5mr7UHccgV4" role="37wK5m">
+            <ref role="3cqZAo" node="5mr7UHccgR4" resolve="constraintSymbol" />
+          </node>
+          <node concept="37vLTw" id="5mr7UHccgX2" role="37wK5m">
+            <ref role="3cqZAo" node="5mr7UHccgSi" resolve="args" />
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="2tJIrI" id="5mr7UHccgXY" role="jymVt" />
+    <node concept="3Tm1VV" id="5mr7UHccgL_" role="1B3o_S" />
+    <node concept="3uibUv" id="5mr7UHccgMF" role="1zkMxy">
+      <ref role="3uigEE" to="qrld:5uFPQ7BZsAX" resolve="AbstractConstraint" />
+    </node>
+    <node concept="3uibUv" id="5mr7UHcclM3" role="EKbjA">
+      <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
+    </node>
+    <node concept="3clFb_" id="5mr7UHcclSi" role="jymVt">
+      <property role="1EzhhJ" value="false" />
+      <property role="TrG5h" value="constraint" />
+      <node concept="3uibUv" id="5mr7UHcclSj" role="3clF45">
+        <ref role="3uigEE" to="qrld:6Kcfpq7BfEn" resolve="Constraint" />
+      </node>
+      <node concept="3Tm1VV" id="5mr7UHcclSk" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHcclSn" role="3clF47">
+        <node concept="3clFbF" id="5mr7UHcclYY" role="3cqZAp">
+          <node concept="Xjq3P" id="5mr7UHcclYX" role="3clFbG" />
+        </node>
+      </node>
+    </node>
   </node>
 </model>
 
diff --git a/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/constraint.mps b/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/constraint.mps
index 08c5feea..842a5fea 100644
--- a/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/constraint.mps
+++ b/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/constraint.mps
@@ -2333,7 +2333,7 @@
             <node concept="2OqwBi" id="5uFPQ7BZueq" role="37vLTJ">
               <node concept="Xjq3P" id="5uFPQ7BZuet" role="2Oq$k0" />
               <node concept="2OwXpG" id="5uFPQ7BZuep" role="2OqNvi">
-                <ref role="2Oxat5" node="5uFPQ7BZuef" resolve="argTypes" />
+                <ref role="2Oxat5" node="5uFPQ7BZuef" resolve="arguments" />
               </node>
             </node>
             <node concept="37vLTw" id="5uFPQ7BZueu" role="37vLTx">
@@ -2405,42 +2405,6 @@
       </node>
     </node>
     <node concept="2tJIrI" id="5uFPQ7BZv8C" role="jymVt" />
-    <node concept="3clFb_" id="5uFPQ7BZuRF" role="jymVt">
-      <property role="TrG5h" value="asConstraint" />
-      <node concept="3uibUv" id="5uFPQ7BZuRG" role="3clF45">
-        <ref role="3uigEE" node="6Kcfpq7BfEn" resolve="Constraint" />
-      </node>
-      <node concept="3Tm1VV" id="5uFPQ7BZuRH" role="1B3o_S" />
-      <node concept="3clFbS" id="5uFPQ7BZuRI" role="3clF47">
-        <node concept="3clFbF" id="5uFPQ7BZuRJ" role="3cqZAp">
-          <node concept="10QFUN" id="5uFPQ7BZuRK" role="3clFbG">
-            <node concept="Xjq3P" id="5uFPQ7BZuRL" role="10QFUP" />
-            <node concept="3uibUv" id="5uFPQ7BZuRM" role="10QFUM">
-              <ref role="3uigEE" node="6Kcfpq7BfEn" resolve="Constraint" />
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="5uFPQ7BZuRN" role="jymVt" />
-    <node concept="3clFb_" id="5uFPQ7BZuRO" role="jymVt">
-      <property role="TrG5h" value="asAutoConstraint" />
-      <node concept="3uibUv" id="5uFPQ7BZuRP" role="3clF45">
-        <ref role="3uigEE" node="6Kcfpq7Bj7q" resolve="Predicate" />
-      </node>
-      <node concept="3Tm1VV" id="5uFPQ7BZuRQ" role="1B3o_S" />
-      <node concept="3clFbS" id="5uFPQ7BZuRR" role="3clF47">
-        <node concept="3clFbF" id="5uFPQ7BZuRS" role="3cqZAp">
-          <node concept="10QFUN" id="5uFPQ7BZuRT" role="3clFbG">
-            <node concept="Xjq3P" id="5uFPQ7BZuRU" role="10QFUP" />
-            <node concept="3uibUv" id="5uFPQ7BZuRV" role="10QFUM">
-              <ref role="3uigEE" node="6Kcfpq7Bj7q" resolve="Predicate" />
-            </node>
-          </node>
-        </node>
-      </node>
-    </node>
-    <node concept="2tJIrI" id="5uFPQ7BZuQo" role="jymVt" />
     <node concept="3clFb_" id="5uFPQ7BZsCD" role="jymVt">
       <property role="1EzhhJ" value="false" />
       <property role="TrG5h" value="symbol" />
@@ -2476,7 +2440,7 @@
               <ref role="37wK5l" to="33ny:~Arrays.asList(java.lang.Object...):java.util.List" resolve="asList" />
               <ref role="1Pybhc" to="33ny:~Arrays" resolve="Arrays" />
               <node concept="37vLTw" id="5uFPQ7BZvJo" role="37wK5m">
-                <ref role="3cqZAo" node="5uFPQ7BZuef" resolve="argTypes" />
+                <ref role="3cqZAo" node="5uFPQ7BZuef" resolve="arguments" />
               </node>
             </node>
           </node>
@@ -2496,7 +2460,7 @@
       </node>
     </node>
     <node concept="312cEg" id="5uFPQ7BZuef" role="jymVt">
-      <property role="TrG5h" value="argTypes" />
+      <property role="TrG5h" value="arguments" />
       <node concept="3Tm6S6" id="5uFPQ7BZueg" role="1B3o_S" />
       <node concept="10Q1$e" id="5uFPQ7BZzdN" role="1tU5fm">
         <node concept="3uibUv" id="5uFPQ7BZzdK" role="10Q1$1">
diff --git a/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/program.mps b/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/program.mps
index b261c611..91bf40dc 100644
--- a/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/program.mps
+++ b/languages/jetbrains.mps.logic/reactor/models/jetbrains/mps/logic/reactor/program.mps
@@ -40,9 +40,6 @@
         <property id="1070475926801" name="value" index="Xl_RC" />
       </concept>
       <concept id="1081236700938" name="jetbrains.mps.baseLanguage.structure.StaticMethodDeclaration" flags="ig" index="2YIFZL" />
-      <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>
@@ -54,11 +51,15 @@
       <concept id="1068390468198" name="jetbrains.mps.baseLanguage.structure.ClassConcept" flags="ig" index="312cEu">
         <property id="1075300953594" name="abstractClass" index="1sVAO0" />
       </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="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>
@@ -87,7 +88,9 @@
         <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="1212685548494" name="jetbrains.mps.baseLanguage.structure.ClassCreator" flags="nn" index="1pGfFk">
+        <child id="1212687122400" name="typeParameter" index="1pMfVU" />
+      </concept>
       <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" />
@@ -228,10 +231,33 @@
       </node>
       <node concept="3Tm1VV" id="7ISVfSIwfK" role="1B3o_S" />
       <node concept="3clFbS" id="7ISVfSIwfL" role="3clF47">
-        <node concept="3clFbF" id="7ISVfSIwKa" role="3cqZAp">
-          <node concept="2ShNRf" id="7ISVfSIwK8" role="3clFbG">
-            <node concept="1pGfFk" id="7ISVfSIxpi" role="2ShVmc">
-              <ref role="37wK5l" node="7ISVfSIxgm" resolve="EvaluationSession.Config" />
+        <node concept="3clFbJ" id="5mr7UHcbuz5" role="3cqZAp">
+          <node concept="3clFbS" id="5mr7UHcbuz6" role="3clFbx">
+            <node concept="YS8fn" id="5mr7UHcbuz7" role="3cqZAp">
+              <node concept="2ShNRf" id="5mr7UHcbuz8" role="YScLw">
+                <node concept="1pGfFk" id="5mr7UHcbuz9" role="2ShVmc">
+                  <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
+                  <node concept="Xl_RD" id="5mr7UHcbuza" role="37wK5m">
+                    <property role="Xl_RC" value="no backend" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbC" id="5mr7UHcbuzb" role="3clFbw">
+            <node concept="10Nm6u" id="5mr7UHcbuzc" role="3uHU7w" />
+            <node concept="37vLTw" id="5mr7UHcbuzf" role="3uHU7B">
+              <ref role="3cqZAo" node="5uFPQ7BwtFE" resolve="ourBackend" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbF" id="5mr7UHcbuzh" role="3cqZAp">
+          <node concept="2OqwBi" id="5mr7UHcbuzi" role="3clFbG">
+            <node concept="37vLTw" id="5mr7UHcbuzm" role="2Oq$k0">
+              <ref role="3cqZAo" node="5uFPQ7BwtFE" resolve="ourBackend" />
+            </node>
+            <node concept="liA8E" id="5mr7UHcbuzj" role="2OqNvi">
+              <ref role="37wK5l" node="5mr7UHcbuF5" resolve="createConfig" />
             </node>
           </node>
         </node>
@@ -241,10 +267,11 @@
     <node concept="312cEu" id="5uFPQ7Bwt8Z" role="jymVt">
       <property role="2bfB8j" value="false" />
       <property role="TrG5h" value="Config" />
+      <property role="1sVAO0" value="true" />
       <node concept="2tJIrI" id="5uFPQ7BwtaY" role="jymVt" />
       <node concept="3clFbW" id="7ISVfSIxgm" role="jymVt">
         <node concept="3cqZAl" id="7ISVfSIxgp" role="3clF45" />
-        <node concept="3Tm6S6" id="7ISVfSIxsy" role="1B3o_S" />
+        <node concept="3Tmbuc" id="5mr7UHcbwBO" role="1B3o_S" />
         <node concept="3clFbS" id="7ISVfSIxgr" role="3clF47" />
       </node>
       <node concept="2tJIrI" id="7ISVfSIwT4" role="jymVt" />
@@ -284,61 +311,122 @@
       <node concept="2tJIrI" id="5uFPQ7Bwvfj" role="jymVt" />
       <node concept="3clFb_" id="5uFPQ7Bwvg_" role="jymVt">
         <property role="TrG5h" value="withTrace" />
+        <node concept="37vLTG" id="5mr7UHcbrGT" role="3clF46">
+          <property role="TrG5h" value="computingTracer" />
+          <node concept="3uibUv" id="5mr7UHcbrPY" role="1tU5fm">
+            <ref role="3uigEE" to="qrld:24Vro6cQnrj" resolve="ComputingTracer" />
+          </node>
+        </node>
         <node concept="3uibUv" id="5uFPQ7Bwvia" role="3clF45">
           <ref role="3uigEE" node="5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
         </node>
         <node concept="3Tm1VV" id="5uFPQ7BwvgC" role="1B3o_S" />
         <node concept="3clFbS" id="5uFPQ7BwvgD" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHcbs2E" role="3cqZAp">
+            <node concept="37vLTI" id="5mr7UHcbs2G" role="3clFbG">
+              <node concept="2OqwBi" id="5mr7UHcbs2K" role="37vLTJ">
+                <node concept="Xjq3P" id="5mr7UHcbs2N" role="2Oq$k0" />
+                <node concept="2OwXpG" id="5mr7UHcbs2J" role="2OqNvi">
+                  <ref role="2Oxat5" node="5mr7UHcbs2A" resolve="computingTracer" />
+                </node>
+              </node>
+              <node concept="37vLTw" id="5mr7UHcbs2O" role="37vLTx">
+                <ref role="3cqZAo" node="5mr7UHcbrGT" resolve="computingTracer" />
+              </node>
+            </node>
+          </node>
           <node concept="3clFbF" id="5uFPQ7BwvnB" role="3cqZAp">
             <node concept="Xjq3P" id="5uFPQ7BwvnA" role="3clFbG" />
           </node>
         </node>
       </node>
-      <node concept="2tJIrI" id="7ISVfSIuJo" role="jymVt" />
+      <node concept="2tJIrI" id="5mr7UHcbcbV" role="jymVt" />
+      <node concept="3clFb_" id="5mr7UHcbbR2" role="jymVt">
+        <property role="TrG5h" value="withParam" />
+        <node concept="37vLTG" id="5mr7UHcbcpj" role="3clF46">
+          <property role="TrG5h" value="key" />
+          <node concept="17QB3L" id="5mr7UHcbcs$" role="1tU5fm" />
+        </node>
+        <node concept="37vLTG" id="5mr7UHcbctA" role="3clF46">
+          <property role="TrG5h" value="param" />
+          <node concept="3uibUv" id="5mr7UHcbcxl" role="1tU5fm">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+        </node>
+        <node concept="3uibUv" id="5mr7UHcbjuP" role="3clF45">
+          <ref role="3uigEE" node="5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
+        </node>
+        <node concept="3Tm1VV" id="5mr7UHcbbR5" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbbR6" role="3clF47">
+          <node concept="3clFbF" id="5mr7UHcbdeU" role="3cqZAp">
+            <node concept="2OqwBi" id="5mr7UHcbdgN" role="3clFbG">
+              <node concept="37vLTw" id="5mr7UHcbdeT" role="2Oq$k0">
+                <ref role="3cqZAo" node="5mr7UHcbcAv" resolve="parameters" />
+              </node>
+              <node concept="liA8E" id="5mr7UHcbdni" role="2OqNvi">
+                <ref role="37wK5l" to="33ny:~Map.put(java.lang.Object,java.lang.Object):java.lang.Object" resolve="put" />
+                <node concept="37vLTw" id="5mr7UHcbdq7" role="37wK5m">
+                  <ref role="3cqZAo" node="5mr7UHcbcpj" resolve="key" />
+                </node>
+                <node concept="37vLTw" id="5mr7UHcbdvq" role="37wK5m">
+                  <ref role="3cqZAo" node="5mr7UHcbctA" resolve="param" />
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="5mr7UHcbjFr" role="3cqZAp">
+            <node concept="Xjq3P" id="5mr7UHcbjFp" role="3clFbG" />
+          </node>
+        </node>
+      </node>
+      <node concept="2tJIrI" id="5mr7UHcb$Ol" role="jymVt" />
       <node concept="3clFb_" id="7ISVfSIuSh" role="jymVt">
         <property role="TrG5h" value="start" />
+        <property role="1EzhhJ" value="true" />
         <node concept="3uibUv" id="7ISVfSIv24" role="3clF45">
           <ref role="3uigEE" node="5uFPQ7BvN_d" resolve="EvaluationSession" />
         </node>
         <node concept="3Tm1VV" id="7ISVfSIuSk" role="1B3o_S" />
-        <node concept="3clFbS" id="7ISVfSIuSl" role="3clF47">
-          <node concept="3clFbF" id="7ISVfSIvk2" role="3cqZAp">
-            <node concept="2YIFZM" id="7ISVfSIvp7" role="3clFbG">
-              <ref role="37wK5l" node="5uFPQ7Bwthk" resolve="start" />
-              <ref role="1Pybhc" node="5uFPQ7BvN_d" resolve="EvaluationSession" />
-              <node concept="Xjq3P" id="7ISVfSIvu9" role="37wK5m" />
-            </node>
-          </node>
-        </node>
+        <node concept="3clFbS" id="7ISVfSIuSl" role="3clF47" />
       </node>
-      <node concept="2tJIrI" id="5uFPQ7Bwuj4" role="jymVt" />
-      <node concept="3clFb_" id="7ISVfSIiZn" role="jymVt">
-        <property role="TrG5h" value="getPredicateSymbols" />
-        <node concept="10Q1$e" id="7ISVfSIiZo" role="3clF45">
-          <node concept="3uibUv" id="7ISVfSIiZp" role="10Q1$1">
-            <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
-          </node>
-        </node>
-        <node concept="3Tm1VV" id="7ISVfSIiZq" role="1B3o_S" />
-        <node concept="3clFbS" id="7ISVfSIiZr" role="3clF47">
-          <node concept="3clFbF" id="7ISVfSIiZs" role="3cqZAp">
-            <node concept="37vLTw" id="7ISVfSIiZm" role="3clFbG">
-              <ref role="3cqZAo" node="7ISVfSIioQ" resolve="predicateSymbols" />
-            </node>
-          </node>
-        </node>
-      </node>
-      <node concept="2tJIrI" id="7ISVfSIjE_" role="jymVt" />
+      <node concept="2tJIrI" id="5mr7UHcbwTX" role="jymVt" />
       <node concept="3Tm1VV" id="5uFPQ7Bwt90" role="1B3o_S" />
       <node concept="312cEg" id="7ISVfSIioQ" role="jymVt">
         <property role="TrG5h" value="predicateSymbols" />
-        <node concept="3Tm6S6" id="7ISVfSIioR" role="1B3o_S" />
+        <node concept="3Tmbuc" id="5mr7UHcbtUi" role="1B3o_S" />
         <node concept="10Q1$e" id="7ISVfSIix5" role="1tU5fm">
           <node concept="3uibUv" id="7ISVfSIix7" role="10Q1$1">
             <ref role="3uigEE" to="qrld:5uFPQ7B$$3f" resolve="PredicateSymbol" />
           </node>
         </node>
       </node>
+      <node concept="312cEg" id="5mr7UHcbcAv" role="jymVt">
+        <property role="TrG5h" value="parameters" />
+        <node concept="3Tmbuc" id="5mr7UHcbtVS" role="1B3o_S" />
+        <node concept="3uibUv" id="5mr7UHcbcEh" role="1tU5fm">
+          <ref role="3uigEE" to="33ny:~Map" resolve="Map" />
+          <node concept="17QB3L" id="5mr7UHcbcEz" role="11_B2D" />
+          <node concept="3uibUv" id="5mr7UHcbcF8" role="11_B2D">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+          </node>
+        </node>
+        <node concept="2ShNRf" id="5mr7UHcbcTG" role="33vP2m">
+          <node concept="1pGfFk" id="5mr7UHcbd42" role="2ShVmc">
+            <ref role="37wK5l" to="33ny:~HashMap.&lt;init&gt;()" resolve="HashMap" />
+            <node concept="17QB3L" id="5mr7UHcbd7P" role="1pMfVU" />
+            <node concept="3uibUv" id="5mr7UHcbdce" role="1pMfVU">
+              <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="312cEg" id="5mr7UHcbs2A" role="jymVt">
+        <property role="TrG5h" value="computingTracer" />
+        <node concept="3Tmbuc" id="5mr7UHcbtYG" role="1B3o_S" />
+        <node concept="3uibUv" id="5mr7UHcbs2D" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:24Vro6cQnrj" resolve="ComputingTracer" />
+        </node>
+      </node>
     </node>
     <node concept="2tJIrI" id="5uFPQ7Bwwl1" role="jymVt" />
     <node concept="3clFb_" id="7ISVfSIWX_" role="jymVt">
@@ -421,12 +509,6 @@
     <node concept="3clFb_" id="5uFPQ7BvQxv" role="jymVt">
       <property role="TrG5h" value="constraintOccurrences" />
       <property role="1EzhhJ" value="true" />
-      <node concept="37vLTG" id="5uFPQ7BvQzF" role="3clF46">
-        <property role="TrG5h" value="symbol" />
-        <node concept="3uibUv" id="5uFPQ7BZbEn" role="1tU5fm">
-          <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
-        </node>
-      </node>
       <node concept="3uibUv" id="5uFPQ7BZbCW" role="3clF45">
         <ref role="3uigEE" to="wyt6:~Iterable" resolve="Iterable" />
         <node concept="3uibUv" id="5uFPQ7BZbEd" role="11_B2D">
@@ -436,57 +518,26 @@
       <node concept="3Tm1VV" id="5uFPQ7BvQxy" role="1B3o_S" />
       <node concept="3clFbS" id="5uFPQ7BvQxz" role="3clF47" />
     </node>
-    <node concept="2tJIrI" id="5uFPQ7BZbRm" role="jymVt" />
-    <node concept="2tJIrI" id="5uFPQ7BZbUe" role="jymVt" />
-    <node concept="2YIFZL" id="5uFPQ7Bwthk" role="jymVt">
-      <property role="TrG5h" value="start" />
-      <node concept="37vLTG" id="5uFPQ7BwtjP" role="3clF46">
-        <property role="TrG5h" value="config" />
-        <node concept="3uibUv" id="5uFPQ7Bwtko" role="1tU5fm">
-          <ref role="3uigEE" node="5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
+    <node concept="2tJIrI" id="5mr7UHccvSI" role="jymVt" />
+    <node concept="3clFb_" id="5mr7UHccvdG" role="jymVt">
+      <property role="TrG5h" value="constraintOccurrences" />
+      <property role="1EzhhJ" value="true" />
+      <node concept="37vLTG" id="5mr7UHccvdH" role="3clF46">
+        <property role="TrG5h" value="symbol" />
+        <node concept="3uibUv" id="5mr7UHccvdI" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:54i3FxcZHHF" resolve="ConstraintSymbol" />
         </node>
       </node>
-      <node concept="3uibUv" id="5uFPQ7Bwtiq" role="3clF45">
-        <ref role="3uigEE" node="5uFPQ7BvN_d" resolve="EvaluationSession" />
-      </node>
-      <node concept="3Tmbuc" id="7ISVfSIuGU" role="1B3o_S" />
-      <node concept="3clFbS" id="5uFPQ7Bwtho" role="3clF47">
-        <node concept="3clFbJ" id="5uFPQ7Bwu4q" role="3cqZAp">
-          <node concept="3clFbS" id="5uFPQ7Bwu4r" role="3clFbx">
-            <node concept="YS8fn" id="5uFPQ7Bwu4s" role="3cqZAp">
-              <node concept="2ShNRf" id="5uFPQ7Bwu4t" role="YScLw">
-                <node concept="1pGfFk" id="5uFPQ7Bwu4u" role="2ShVmc">
-                  <ref role="37wK5l" to="wyt6:~IllegalStateException.&lt;init&gt;(java.lang.String)" resolve="IllegalStateException" />
-                  <node concept="Xl_RD" id="5uFPQ7Bwu4v" role="37wK5m">
-                    <property role="Xl_RC" value="no backend" />
-                  </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbC" id="5uFPQ7Bwu4w" role="3clFbw">
-            <node concept="10Nm6u" id="5uFPQ7Bwu4x" role="3uHU7w" />
-            <node concept="37vLTw" id="5uFPQ7Bwu4_" role="3uHU7B">
-              <ref role="3cqZAo" node="5uFPQ7BwtFE" resolve="ourBackend" />
-            </node>
-          </node>
-        </node>
-        <node concept="3clFbF" id="5uFPQ7Bwu4B" role="3cqZAp">
-          <node concept="2OqwBi" id="5uFPQ7Bwu4C" role="3clFbG">
-            <node concept="37vLTw" id="5uFPQ7Bwu4H" role="2Oq$k0">
-              <ref role="3cqZAo" node="5uFPQ7BwtFE" resolve="ourBackend" />
-            </node>
-            <node concept="liA8E" id="5uFPQ7Bwu4D" role="2OqNvi">
-              <ref role="37wK5l" node="5uFPQ7Bwtr5" resolve="start" />
-              <node concept="37vLTw" id="5uFPQ7Bwu8$" role="37wK5m">
-                <ref role="3cqZAo" node="5uFPQ7BwtjP" resolve="config" />
-              </node>
-            </node>
-          </node>
+      <node concept="3uibUv" id="5mr7UHccvdJ" role="3clF45">
+        <ref role="3uigEE" to="wyt6:~Iterable" resolve="Iterable" />
+        <node concept="3uibUv" id="5mr7UHccvdK" role="11_B2D">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
+      <node concept="3Tm1VV" id="5mr7UHccvdL" role="1B3o_S" />
+      <node concept="3clFbS" id="5mr7UHccvdM" role="3clF47" />
     </node>
-    <node concept="2tJIrI" id="5uFPQ7Bwtfy" role="jymVt" />
+    <node concept="2tJIrI" id="5uFPQ7BZbRm" role="jymVt" />
     <node concept="3HP615" id="5uFPQ7BwtoR" role="jymVt">
       <property role="2bfB8j" value="true" />
       <property role="TrG5h" value="Backend" />
@@ -501,22 +552,16 @@
         <node concept="3clFbS" id="5uFPQ7BwtvS" role="3clF47" />
       </node>
       <node concept="2tJIrI" id="5uFPQ7Bwtvq" role="jymVt" />
-      <node concept="3clFb_" id="5uFPQ7Bwtr5" role="jymVt">
+      <node concept="3clFb_" id="5mr7UHcbuF5" role="jymVt">
         <property role="1EzhhJ" value="true" />
-        <property role="TrG5h" value="start" />
-        <node concept="37vLTG" id="5uFPQ7BwttK" role="3clF46">
-          <property role="TrG5h" value="config" />
-          <node concept="3uibUv" id="5uFPQ7Bwtum" role="1tU5fm">
-            <ref role="3uigEE" node="5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
-          </node>
+        <property role="TrG5h" value="createConfig" />
+        <node concept="3uibUv" id="5mr7UHcbuIP" role="3clF45">
+          <ref role="3uigEE" node="5uFPQ7Bwt8Z" resolve="EvaluationSession.Config" />
         </node>
-        <node concept="3uibUv" id="5uFPQ7BwtrQ" role="3clF45">
-          <ref role="3uigEE" node="5uFPQ7BvN_d" resolve="EvaluationSession" />
-        </node>
-        <node concept="3Tm1VV" id="5uFPQ7Bwtr8" role="1B3o_S" />
-        <node concept="3clFbS" id="5uFPQ7Bwtr9" role="3clF47" />
+        <node concept="3Tm1VV" id="5mr7UHcbuF8" role="1B3o_S" />
+        <node concept="3clFbS" id="5mr7UHcbuF9" role="3clF47" />
       </node>
-      <node concept="2tJIrI" id="5uFPQ7Bwtqz" role="jymVt" />
+      <node concept="2tJIrI" id="5mr7UHcbuCs" role="jymVt" />
       <node concept="3Tmbuc" id="5uFPQ7Bwtsc" role="1B3o_S" />
     </node>
     <node concept="2tJIrI" id="5uFPQ7BvQ$M" role="jymVt" />
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 5cbd1f36..74d9c85b 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
@@ -1200,8 +1200,8 @@
       <property role="TrG5h" value="result" />
       <node concept="37vLTG" id="7nkyKX7gU0U" role="3clF46">
         <property role="TrG5h" value="constraint" />
-        <node concept="3uibUv" id="7nkyKX7gU0V" role="1tU5fm">
-          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        <node concept="3uibUv" id="5mr7UHccdcS" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
       <node concept="3cqZAl" id="7nkyKX7gU0Y" role="3clF45" />
@@ -1214,8 +1214,8 @@
       <property role="TrG5h" value="garbage" />
       <node concept="37vLTG" id="7nkyKX7gU3M" role="3clF46">
         <property role="TrG5h" value="constraint" />
-        <node concept="3uibUv" id="7nkyKX7gU3N" role="1tU5fm">
-          <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+        <node concept="3uibUv" id="5mr7UHccdlH" role="1tU5fm">
+          <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
         </node>
       </node>
       <node concept="3cqZAl" id="7nkyKX7gU3Q" role="3clF45" />
@@ -1281,8 +1281,8 @@
               <property role="TrG5h" value="result" />
               <node concept="37vLTG" id="7nkyKX7h9eH" role="3clF46">
                 <property role="TrG5h" value="constraint" />
-                <node concept="3uibUv" id="7nkyKX7h9eI" role="1tU5fm">
-                  <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+                <node concept="3uibUv" id="5mr7UHccduP" role="1tU5fm">
+                  <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
                 </node>
               </node>
               <node concept="3cqZAl" id="7nkyKX7h9eJ" role="3clF45" />
@@ -1294,8 +1294,8 @@
               <property role="TrG5h" value="garbage" />
               <node concept="37vLTG" id="7nkyKX7h9eP" role="3clF46">
                 <property role="TrG5h" value="constraint" />
-                <node concept="3uibUv" id="7nkyKX7h9eQ" role="1tU5fm">
-                  <ref role="3uigEE" to="eifs:~IConstraint" resolve="IConstraint" />
+                <node concept="3uibUv" id="5mr7UHccd_Z" role="1tU5fm">
+                  <ref role="3uigEE" to="qrld:5uFPQ7BZac$" resolve="ConstraintOccurrence" />
                 </node>
               </node>
               <node concept="3cqZAl" id="7nkyKX7h9eR" role="3clF45" />
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/java.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/java.mps
index fa5de0f6..fcffd999 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/java.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/java.mps
@@ -40,12 +40,7 @@
       </concept>
       <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="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="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" />
@@ -189,15 +184,8 @@
             <property role="3SKdUp" value="FIXME: implement me" />
           </node>
         </node>
-        <node concept="YS8fn" id="5uFPQ7Cjcze" role="3cqZAp">
-          <node concept="2ShNRf" id="5uFPQ7Cjc$3" role="YScLw">
-            <node concept="1pGfFk" id="5uFPQ7CjcGN" role="2ShVmc">
-              <ref role="37wK5l" to="wyt6:~UnsupportedOperationException.&lt;init&gt;(java.lang.String)" resolve="UnsupportedOperationException" />
-              <node concept="Xl_RD" id="5uFPQ7CjcHH" role="37wK5m">
-                <property role="Xl_RC" value="not implemented" />
-              </node>
-            </node>
-          </node>
+        <node concept="3clFbF" id="5mr7UHclimT" role="3cqZAp">
+          <node concept="10Nm6u" id="5mr7UHclimR" role="3clFbG" />
         </node>
       </node>
       <node concept="2AHcQZ" id="4xBopTzrlec" role="2AJF6D">
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 a98d4ad7..a25e4b58 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
@@ -1167,9 +1167,6 @@
       <node concept="3clFbS" id="4xBopTzmopB" role="3clF47">
         <node concept="XkiVB" id="4xBopTzmoNB" role="3cqZAp">
           <ref role="37wK5l" to="qrld:6Kcfpq7B1f7" resolve="AbstractPredicate" />
-          <node concept="37vLTw" id="5uFPQ7C29mz" role="37wK5m">
-            <ref role="3cqZAo" node="5uFPQ7C29mw" resolve="UNI_SYM" />
-          </node>
           <node concept="37vLTw" id="5uFPQ7C29Rp" role="37wK5m">
             <ref role="3cqZAo" node="5uFPQ7C29xx" resolve="left" />
           </node>
@@ -1936,9 +1933,6 @@
       <node concept="3clFbS" id="4xBopTzo_Q5" role="3clF47">
         <node concept="XkiVB" id="4xBopTzoAs2" role="3cqZAp">
           <ref role="37wK5l" to="qrld:6Kcfpq7B1f7" resolve="AbstractPredicate" />
-          <node concept="37vLTw" id="5uFPQ7C23RY" role="37wK5m">
-            <ref role="3cqZAo" node="5uFPQ7C23RV" resolve="EQ_SYM" />
-          </node>
           <node concept="37vLTw" id="5uFPQ7C24EQ" role="37wK5m">
             <ref role="3cqZAo" node="5uFPQ7C24iY" resolve="left" />
           </node>
@@ -2054,9 +2048,6 @@
       <node concept="3clFbS" id="4xBopTzrPWp" role="3clF47">
         <node concept="XkiVB" id="4xBopTzrQgb" role="3cqZAp">
           <ref role="37wK5l" to="qrld:6Kcfpq7B1f7" resolve="AbstractPredicate" />
-          <node concept="37vLTw" id="5uFPQ7BZnLE" role="37wK5m">
-            <ref role="3cqZAo" node="5uFPQ7BZnLB" resolve="ASSERT_SYM" />
-          </node>
           <node concept="37vLTw" id="5uFPQ7C25fP" role="37wK5m">
             <ref role="3cqZAo" node="5uFPQ7C251x" resolve="expression" />
           </node>
diff --git a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/var.mps b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/var.mps
index 93dce6de..0e9ba170 100644
--- a/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/var.mps
+++ b/languages/jetbrains.mps.logic/runtime/models/jetbrains/mps/logic/builtin/var.mps
@@ -144,7 +144,6 @@
   <node concept="312cEu" id="5$WbtTOYoMb">
     <property role="TrG5h" value="LogicalBuiltinConstraint" />
     <property role="1sVAO0" value="false" />
-    <node concept="2tJIrI" id="7ISVfSJpRF" role="jymVt" />
     <node concept="2tJIrI" id="5$WbtTOYpQU" role="jymVt" />
     <node concept="Wx3nA" id="5uFPQ7C26$b" role="jymVt">
       <property role="TrG5h" value="BOUND_SYM" />
@@ -157,7 +156,7 @@
         <node concept="1pGfFk" id="5uFPQ7C26X5" role="2ShVmc">
           <ref role="37wK5l" to="qrld:5uFPQ7B$$fT" resolve="PredicateSymbol" />
           <node concept="Xl_RD" id="5uFPQ7C272B" role="37wK5m">
-            <property role="Xl_RC" value="bound" />
+            <property role="Xl_RC" value="isNonVar" />
           </node>
           <node concept="3cmrfG" id="5uFPQ7C276T" role="37wK5m">
             <property role="3cmrfH" value="1" />
@@ -177,7 +176,7 @@
         <node concept="1pGfFk" id="5uFPQ7C279C" role="2ShVmc">
           <ref role="37wK5l" to="qrld:5uFPQ7B$$fT" resolve="PredicateSymbol" />
           <node concept="Xl_RD" id="5uFPQ7C279D" role="37wK5m">
-            <property role="Xl_RC" value="free" />
+            <property role="Xl_RC" value="isVar" />
           </node>
           <node concept="3cmrfG" id="5uFPQ7C279E" role="37wK5m">
             <property role="3cmrfH" value="1" />
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 9ab0f583..4960f9be 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
@@ -726,13 +726,6 @@
             </node>
             <node concept="3clFbF" id="ZqZbw4Sir2" role="3cqZAp">
               <node concept="37vLTI" id="ZqZbw4SjaZ" role="3clFbG">
-                <node concept="2YIFZM" id="ZqZbw4SkvJ" role="37vLTx">
-                  <ref role="37wK5l" to="wyt6:~String.valueOf(java.lang.Object):java.lang.String" resolve="valueOf" />
-                  <ref role="1Pybhc" to="wyt6:~String" resolve="String" />
-                  <node concept="37vLTw" id="ZqZbw4SkC2" role="37wK5m">
-                    <ref role="3cqZAo" node="ZqZbw4S7uo" resolve="sym" />
-                  </node>
-                </node>
                 <node concept="2OqwBi" id="ZqZbw4Siu$" role="37vLTJ">
                   <node concept="37vLTw" id="ZqZbw4Sir0" role="2Oq$k0">
                     <ref role="3cqZAo" node="ZqZbw4SgSk" resolve="cdeclNode" />
@@ -741,6 +734,14 @@
                     <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
                   </node>
                 </node>
+                <node concept="2OqwBi" id="3ec9Qj4Ph$E" role="37vLTx">
+                  <node concept="37vLTw" id="ZqZbw4SkC2" role="2Oq$k0">
+                    <ref role="3cqZAo" node="ZqZbw4S7uo" resolve="sym" />
+                  </node>
+                  <node concept="liA8E" id="3ec9Qj4PhBb" role="2OqNvi">
+                    <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
+                  </node>
+                </node>
               </node>
             </node>
             <node concept="3clFbH" id="xMpT0BhQwy" role="3cqZAp" />
@@ -2988,7 +2989,7 @@
                             </node>
                             <node concept="liA8E" id="5uFPQ7BM_qD" role="2OqNvi">
                               <ref role="37wK5l" to="wyt6:~String.equals(java.lang.Object):boolean" resolve="equals" />
-                              <node concept="2OqwBi" id="5uFPQ7BM_qE" role="37wK5m">
+                              <node concept="2OqwBi" id="3ec9Qj4KInG" role="37wK5m">
                                 <node concept="2OqwBi" id="5uFPQ7BM_qF" role="2Oq$k0">
                                   <node concept="37vLTw" id="5uFPQ7BRz7x" role="2Oq$k0">
                                     <ref role="3cqZAo" node="5uFPQ7BMz7a" resolve="pred" />
@@ -2997,8 +2998,8 @@
                                     <ref role="37wK5l" to="qrld:6Kcfpq7Bjgi" resolve="symbol" />
                                   </node>
                                 </node>
-                                <node concept="liA8E" id="5uFPQ7BM_qI" role="2OqNvi">
-                                  <ref role="37wK5l" to="qrld:5uFPQ7B$$w_" resolve="toString" />
+                                <node concept="liA8E" id="3ec9Qj4KItp" role="2OqNvi">
+                                  <ref role="37wK5l" to="qrld:54i3FxcZMvt" resolve="id" />
                                 </node>
                               </node>
                             </node>