diff --git a/samples/fitch/.mps/modules.xml b/samples/fitch/.mps/modules.xml
index 93ab66e6..63cf993a 100644
--- a/samples/fitch/.mps/modules.xml
+++ b/samples/fitch/.mps/modules.xml
@@ -4,6 +4,7 @@
     <projectModules>
       <modulePath path="$PROJECT_DIR$/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl" folder="" />
       <modulePath path="$PROJECT_DIR$/languages/jetbrains.mps.fitch/sandbox/jetbrains.mps.fitch.sandbox.msd" folder="" />
+      <modulePath path="$PROJECT_DIR$/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl" folder="" />
     </projectModules>
   </component>
 </project>
\ No newline at end of file
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl b/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
index 30ae4261..0e3d43b1 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
+++ b/samples/fitch/languages/jetbrains.mps.fitch/jetbrains.mps.fitch.mpl
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<language namespace="jetbrains.mps.fitch" uuid="06b7c5c7-e359-4f4b-a581-5d0c9323af39" languageVersion="0" moduleVersion="0">
+<language namespace="jetbrains.mps.fitch" uuid="06b7c5c7-e359-4f4b-a581-5d0c9323af39" languageVersion="1" moduleVersion="1">
   <models>
     <modelRoot contentPath="${module}" type="default">
       <sourceRoot location="models" />
@@ -36,11 +36,12 @@
         <module reference="6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)" version="0" />
         <module reference="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)" version="0" />
         <module reference="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
-        <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="0" />
+        <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="1" />
         <module reference="65b2d9d2-5a92-4dd0-abf5-f3a1bd399bec(jetbrains.mps.fitch#4322786184247805322)" version="0" />
         <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
         <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
         <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
+        <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
       </dependencyVersions>
       <mapping-priorities />
     </generator>
@@ -48,6 +49,7 @@
   <sourcePath />
   <dependencies>
     <dependency reexport="false">06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)</dependency>
+    <dependency reexport="false">ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)</dependency>
   </dependencies>
   <languageVersions>
     <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="5" />
@@ -73,6 +75,8 @@
     <language slang="l:b401a680-8325-4110-8fd3-84331ff25bef:jetbrains.mps.lang.generator" version="0" />
     <language slang="l:d7706f63-9be2-479c-a3da-ae92af1e64d5:jetbrains.mps.lang.generator.generationContext" version="0" />
     <language slang="l:d7a92d38-f7db-40d0-8431-763b0c3c9f20:jetbrains.mps.lang.intentions" version="0" />
+    <language slang="l:90746344-04fd-4286-97d5-b46ae6a81709:jetbrains.mps.lang.migration" version="0" />
+    <language slang="l:9882f4ad-1955-46fe-8269-94189e5dbbf2:jetbrains.mps.lang.migration.util" version="0" />
     <language slang="l:d4615e3b-d671-4ba9-af01-2b78369b0ba7:jetbrains.mps.lang.pattern" version="1" />
     <language slang="l:3a13115c-633c-4c5c-bbcc-75c4219e9555:jetbrains.mps.lang.quotation" version="0" />
     <language slang="l:3ecd7c84-cde3-45de-886c-135ecc69b742:jetbrains.mps.lang.refactoring" version="0" />
@@ -93,12 +97,15 @@
     <module reference="6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)" version="0" />
     <module reference="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea(MPS.Core)" version="0" />
     <module reference="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
-    <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="0" />
+    <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="1" />
     <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
     <module reference="a9e4c532-c5f5-4bb7-99ef-42abb73bbb70(jetbrains.mps.lang.descriptor.aspects)" version="0" />
     <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
     <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
+    <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
   </dependencyVersions>
-  <extendedLanguages />
+  <extendedLanguages>
+    <extendedLanguage>ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)</extendedLanguage>
+  </extendedLanguages>
 </language>
 
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/constraints.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/constraints.mps
index d555cd51..742c5ffa 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/constraints.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/constraints.mps
@@ -429,7 +429,7 @@
   </node>
   <node concept="1M2fIO" id="3JXBM6C7aaV">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1M2myG" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
+    <ref role="1M2myG" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
     <node concept="EnEH3" id="3JXBM6C7aaW" role="1MhHOB">
       <ref role="EomxK" to="tpck:h0TrG11" resolve="name" />
       <node concept="QB0g5" id="3JXBM6C7aaY" role="QCWH9">
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/editor.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/editor.mps
index 291ba11e..8b903db2 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/editor.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/editor.mps
@@ -309,10 +309,18 @@
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
         <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+        <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
       </concept>
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
       </concept>
+      <concept id="709746936026466394" name="jetbrains.mps.lang.core.structure.ChildAttribute" flags="ng" index="3VBwX9">
+        <property id="709746936026609031" name="linkId" index="3V$3ak" />
+        <property id="709746936026609029" name="linkRole" index="3V$3am" />
+      </concept>
+      <concept id="4452961908202556907" name="jetbrains.mps.lang.core.structure.BaseCommentAttribute" flags="ng" index="1X3_iC">
+        <child id="3078666699043039389" name="commentedNode" index="8Wnug" />
+      </concept>
     </language>
     <language id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp">
       <concept id="1174482804200" name="jetbrains.mps.baseLanguage.regexp.structure.PlusRegexp" flags="ng" index="1OClNT" />
@@ -353,7 +361,7 @@
   </registry>
   <node concept="24kQdi" id="3JXBM6C3Cnb">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
     <node concept="3EZMnI" id="3JXBM6C3Cnd" role="2wV5jI">
       <node concept="3F0A7n" id="3JXBM6C3Cnk" role="3EZMnx">
         <ref role="1NtTu8" to="tpck:h0TrG11" resolve="name" />
@@ -363,7 +371,7 @@
   </node>
   <node concept="24kQdi" id="3JXBM6C3Cnr">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
     <node concept="3EZMnI" id="3JXBM6C3Cnt" role="2wV5jI">
       <node concept="3F0ifn" id="3JXBM6C3Cn$" role="3EZMnx">
         <property role="3F0ifm" value="~" />
@@ -373,14 +381,14 @@
         </node>
       </node>
       <node concept="3F1sOY" id="3JXBM6C3CnE" role="3EZMnx">
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3Cno" resolve="target" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3Cno" resolve="target_old" />
       </node>
       <node concept="l2Vlx" id="3JXBM6C3Cnw" role="2iSdaV" />
     </node>
   </node>
   <node concept="24kQdi" id="3JXBM6C3FnY">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3FnV" resolve="And" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
     <node concept="3EZMnI" id="3JXBM6C3Fo0" role="2wV5jI">
       <node concept="3F0ifn" id="3JXBM6C3Fo7" role="3EZMnx">
         <property role="3F0ifm" value="(" />
@@ -391,7 +399,7 @@
       </node>
       <node concept="3F2HdR" id="3JXBM6C3For" role="3EZMnx">
         <property role="2czwfO" value="&amp;" />
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
         <node concept="l2Vlx" id="3JXBM6C3Fot" role="2czzBx" />
         <node concept="3F0ifn" id="3JXBM6C3Fo$" role="2czzBI">
           <property role="3F0ifm" value="" />
@@ -421,7 +429,7 @@
   </node>
   <node concept="24kQdi" id="3JXBM6C3FoB">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
     <node concept="3EZMnI" id="3JXBM6C3FoD" role="2wV5jI">
       <node concept="3F0ifn" id="3JXBM6C3FoK" role="3EZMnx">
         <property role="3F0ifm" value="(" />
@@ -432,7 +440,7 @@
       </node>
       <node concept="3F2HdR" id="3JXBM6C3Fp6" role="3EZMnx">
         <property role="2czwfO" value="|" />
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
         <node concept="l2Vlx" id="3JXBM6C3Fp8" role="2czzBx" />
         <node concept="3F0ifn" id="3JXBM6C3Fpf" role="2czzBI">
           <property role="3F0ifm" value="" />
@@ -462,7 +470,7 @@
   </node>
   <node concept="24kQdi" id="3JXBM6C3Fpn">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3Fph" resolve="If" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
     <node concept="3EZMnI" id="3JXBM6C3Fpp" role="2wV5jI">
       <node concept="3F0ifn" id="3JXBM6C3FqW" role="3EZMnx">
         <property role="3F0ifm" value="(" />
@@ -471,14 +479,14 @@
         </node>
       </node>
       <node concept="3F1sOY" id="3JXBM6C3Fpw" role="3EZMnx">
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fpi" resolve="antecedent" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fpi" resolve="antecedent_old" />
       </node>
       <node concept="3F0ifn" id="3JXBM6C3FpA" role="3EZMnx">
         <property role="3F0ifm" value="=&gt;" />
         <ref role="1ERwB7" node="3JXBM6C9alP" resolve="If_Actions" />
       </node>
       <node concept="3F1sOY" id="3JXBM6C3FpN" role="3EZMnx">
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fpk" resolve="consequent" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3Fpk" resolve="consequent_old" />
         <ref role="1ERwB7" node="3JXBM6C9alP" resolve="If_Actions" />
       </node>
       <node concept="3F0ifn" id="3JXBM6C3Frn" role="3EZMnx">
@@ -492,7 +500,7 @@
   </node>
   <node concept="24kQdi" id="3JXBM6C3Fry">
     <property role="3GE5qa" value="sentence" />
-    <ref role="1XX52x" to="jfgh:3JXBM6C3Frx" resolve="Iff" />
+    <ref role="1XX52x" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
     <node concept="3EZMnI" id="3JXBM6C3Fs1" role="2wV5jI">
       <node concept="3F0ifn" id="3JXBM6C3Fs2" role="3EZMnx">
         <property role="3F0ifm" value="(" />
@@ -501,14 +509,14 @@
         </node>
       </node>
       <node concept="3F1sOY" id="3JXBM6C3Fs4" role="3EZMnx">
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3FrF" resolve="antecedent" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3FrF" resolve="antecedent_old" />
       </node>
       <node concept="3F0ifn" id="3JXBM6C3Fs5" role="3EZMnx">
         <property role="3F0ifm" value="&lt;=&gt;" />
         <ref role="1ERwB7" node="3JXBM6C9dQk" resolve="Iff_Actions" />
       </node>
       <node concept="3F1sOY" id="3JXBM6C3Fs6" role="3EZMnx">
-        <ref role="1NtTu8" to="jfgh:3JXBM6C3FrG" resolve="consequent" />
+        <ref role="1NtTu8" to="jfgh:3JXBM6C3FrG" resolve="consequent_old" />
         <ref role="1ERwB7" node="3JXBM6C9dQk" resolve="Iff_Actions" />
       </node>
       <node concept="3F0ifn" id="3JXBM6C3Fs7" role="3EZMnx">
@@ -887,67 +895,71 @@
   </node>
   <node concept="3p36aQ" id="3JXBM6C6Z0A">
     <property role="3GE5qa" value="sentence" />
-    <ref role="aqKnT" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
-    <node concept="3eGOop" id="3JXBM6C6Z0B" role="3ft7WO">
-      <node concept="ucgPf" id="3JXBM6C6Z0C" role="3aKz83">
-        <node concept="3clFbS" id="3JXBM6C6Z0D" role="2VODD2">
-          <node concept="3cpWs8" id="3JXBM6C75mC" role="3cqZAp">
-            <node concept="3cpWsn" id="3JXBM6C75mD" role="3cpWs9">
-              <property role="TrG5h" value="cst" />
-              <node concept="3Tqbb2" id="3JXBM6C75mA" role="1tU5fm">
-                <ref role="ehGHo" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
-              </node>
-              <node concept="2ShNRf" id="3JXBM6C75mE" role="33vP2m">
-                <node concept="3zrR0B" id="3JXBM6C75mF" role="2ShVmc">
-                  <node concept="3Tqbb2" id="3JXBM6C75mG" role="3zrR0E">
-                    <ref role="ehGHo" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
+    <node concept="1X3_iC" id="4LBPYGUYJOr" role="lGtFl">
+      <property role="3V$3am" value="parts" />
+      <property role="3V$3ak" value="18bc6592-03a6-4e29-a83a-7ff23bde13ba/2000375450116454183/414384289274416996" />
+      <node concept="3eGOop" id="3JXBM6C6Z0B" role="8Wnug">
+        <node concept="ucgPf" id="3JXBM6C6Z0C" role="3aKz83">
+          <node concept="3clFbS" id="3JXBM6C6Z0D" role="2VODD2">
+            <node concept="3cpWs8" id="3JXBM6C75mC" role="3cqZAp">
+              <node concept="3cpWsn" id="3JXBM6C75mD" role="3cpWs9">
+                <property role="TrG5h" value="cst" />
+                <node concept="3Tqbb2" id="3JXBM6C75mA" role="1tU5fm">
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
+                </node>
+                <node concept="2ShNRf" id="3JXBM6C75mE" role="33vP2m">
+                  <node concept="3zrR0B" id="3JXBM6C75mF" role="2ShVmc">
+                    <node concept="3Tqbb2" id="3JXBM6C75mG" role="3zrR0E">
+                      <ref role="ehGHo" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
+                    </node>
                   </node>
                 </node>
               </node>
             </node>
-          </node>
-          <node concept="3clFbF" id="3JXBM6C74Xi" role="3cqZAp">
-            <node concept="2OqwBi" id="3JXBM6C76$E" role="3clFbG">
-              <node concept="2OqwBi" id="3JXBM6C75FT" role="2Oq$k0">
-                <node concept="37vLTw" id="3JXBM6C75mH" role="2Oq$k0">
-                  <ref role="3cqZAo" node="3JXBM6C75mD" resolve="cst" />
+            <node concept="3clFbF" id="3JXBM6C74Xi" role="3cqZAp">
+              <node concept="2OqwBi" id="3JXBM6C76$E" role="3clFbG">
+                <node concept="2OqwBi" id="3JXBM6C75FT" role="2Oq$k0">
+                  <node concept="37vLTw" id="3JXBM6C75mH" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3JXBM6C75mD" resolve="cst" />
+                  </node>
+                  <node concept="3TrcHB" id="3JXBM6C75WM" role="2OqNvi">
+                    <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                  </node>
                 </node>
-                <node concept="3TrcHB" id="3JXBM6C75WM" role="2OqNvi">
-                  <ref role="3TsBF5" to="tpck:h0TrG11" resolve="name" />
+                <node concept="tyxLq" id="3JXBM6C771k" role="2OqNvi">
+                  <node concept="ub8z3" id="3JXBM6C77t4" role="tz02z" />
                 </node>
               </node>
-              <node concept="tyxLq" id="3JXBM6C771k" role="2OqNvi">
-                <node concept="ub8z3" id="3JXBM6C77t4" role="tz02z" />
-              </node>
             </node>
-          </node>
-          <node concept="3clFbF" id="3JXBM6C77$Y" role="3cqZAp">
-            <node concept="37vLTw" id="3JXBM6C77$W" role="3clFbG">
-              <ref role="3cqZAo" node="3JXBM6C75mD" resolve="cst" />
+            <node concept="3clFbF" id="3JXBM6C77$Y" role="3cqZAp">
+              <node concept="37vLTw" id="3JXBM6C77$W" role="3clFbG">
+                <ref role="3cqZAo" node="3JXBM6C75mD" resolve="cst" />
+              </node>
             </node>
           </node>
         </node>
-      </node>
-      <node concept="16NfWO" id="3JXBM6C6Z4I" role="upBLP">
-        <node concept="uGdhv" id="3JXBM6C6Z8N" role="16NeZM">
-          <node concept="3clFbS" id="3JXBM6C6Z8P" role="2VODD2">
-            <node concept="1QpiS5" id="3JXBM6C6Zn_" role="3cqZAp">
-              <node concept="1Qi9sc" id="3JXBM6C6ZnA" role="1YN4dH">
-                <node concept="1OClNT" id="3JXBM6C7hBm" role="1QigWp">
-                  <node concept="1SYyG9" id="3JXBM6C7hK8" role="1OLDsb">
-                    <ref role="1SYXPG" to="tpfp:h5SUJUw" resolve="\w" />
+        <node concept="16NfWO" id="3JXBM6C6Z4I" role="upBLP">
+          <node concept="uGdhv" id="3JXBM6C6Z8N" role="16NeZM">
+            <node concept="3clFbS" id="3JXBM6C6Z8P" role="2VODD2">
+              <node concept="1QpiS5" id="3JXBM6C6Zn_" role="3cqZAp">
+                <node concept="1Qi9sc" id="3JXBM6C6ZnA" role="1YN4dH">
+                  <node concept="1OClNT" id="3JXBM6C7hBm" role="1QigWp">
+                    <node concept="1SYyG9" id="3JXBM6C7hK8" role="1OLDsb">
+                      <ref role="1SYXPG" to="tpfp:h5SUJUw" resolve="\w" />
+                    </node>
                   </node>
                 </node>
-              </node>
-              <node concept="3clFbS" id="3JXBM6C6ZnC" role="1Qpmdr">
-                <node concept="3cpWs6" id="3JXBM6C6ZL6" role="3cqZAp">
-                  <node concept="ub8z3" id="3JXBM6C71sX" role="3cqZAk" />
+                <node concept="3clFbS" id="3JXBM6C6ZnC" role="1Qpmdr">
+                  <node concept="3cpWs6" id="3JXBM6C6ZL6" role="3cqZAp">
+                    <node concept="ub8z3" id="3JXBM6C71sX" role="3cqZAk" />
+                  </node>
                 </node>
+                <node concept="ub8z3" id="3JXBM6C6Zwd" role="1QpSPf" />
+              </node>
+              <node concept="3clFbF" id="3JXBM6C72hu" role="3cqZAp">
+                <node concept="Xl_RD" id="3JXBM6C72ht" role="3clFbG" />
               </node>
-              <node concept="ub8z3" id="3JXBM6C6Zwd" role="1QpSPf" />
-            </node>
-            <node concept="3clFbF" id="3JXBM6C72hu" role="3cqZAp">
-              <node concept="Xl_RD" id="3JXBM6C72ht" role="3clFbG" />
             </node>
           </node>
         </node>
@@ -956,7 +968,7 @@
   </node>
   <node concept="IW6AY" id="3JXBM6C7kDX">
     <property role="3GE5qa" value="sentence" />
-    <ref role="aqKnT" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
     <node concept="1Qtc8_" id="3JXBM6C7kDY" role="IW6Ez">
       <node concept="IWgqT" id="3JXBM6C7kEa" role="1Qtc8A">
         <node concept="1hCUdq" id="3JXBM6C7kEc" role="1hCUd6">
@@ -974,7 +986,7 @@
               <node concept="3cpWsn" id="3JXBM6C7mal" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C7maj" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C7mam" role="33vP2m" />
               </node>
@@ -983,12 +995,12 @@
               <node concept="3cpWsn" id="3JXBM6C7mfV" role="3cpWs9">
                 <property role="TrG5h" value="and" />
                 <node concept="3Tqbb2" id="3JXBM6C7mfR" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3FnV" resolve="And" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C7mfW" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C7mfX" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C7mfY" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FnV" resolve="And" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
                   </node>
                 </node>
               </node>
@@ -1000,7 +1012,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7mfV" resolve="and" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7mAj" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="TSZUe" id="3JXBM6C7qCF" role="2OqNvi">
@@ -1017,7 +1029,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7mfV" resolve="and" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7zyY" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="WFELt" id="3JXBM6C7Dm8" role="2OqNvi" />
@@ -1042,7 +1054,7 @@
               <node concept="3cpWsn" id="3JXBM6C7Ocg" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C7Och" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C7Oci" role="33vP2m" />
               </node>
@@ -1051,12 +1063,12 @@
               <node concept="3cpWsn" id="3JXBM6C7Ock" role="3cpWs9">
                 <property role="TrG5h" value="or" />
                 <node concept="3Tqbb2" id="3JXBM6C7Ocl" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C7Ocm" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C7Ocn" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C7Oco" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
                   </node>
                 </node>
               </node>
@@ -1068,7 +1080,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7Ock" resolve="or" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7QMJ" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="TSZUe" id="3JXBM6C7Ocu" role="2OqNvi">
@@ -1085,7 +1097,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7Ock" resolve="or" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7R9X" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="WFELt" id="3JXBM6C7Oc_" role="2OqNvi" />
@@ -1110,7 +1122,7 @@
               <node concept="3cpWsn" id="3JXBM6C8cFt" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C8cFu" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C8cFv" role="33vP2m" />
               </node>
@@ -1119,12 +1131,12 @@
               <node concept="3cpWsn" id="3JXBM6C8cFx" role="3cpWs9">
                 <property role="TrG5h" value="_if" />
                 <node concept="3Tqbb2" id="3JXBM6C8cFy" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Fph" resolve="If" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C8cFz" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C8cF$" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C8cF_" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Fph" resolve="If" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
                   </node>
                 </node>
               </node>
@@ -1136,7 +1148,7 @@
                     <ref role="3cqZAo" node="3JXBM6C8cFx" resolve="_if" />
                   </node>
                   <node concept="3TrEf2" id="3JXBM6C8eLI" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpi" resolve="antecedent" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpi" resolve="antecedent_old" />
                   </node>
                 </node>
                 <node concept="2oxUTD" id="3JXBM6C8f7p" role="2OqNvi">
@@ -1153,7 +1165,7 @@
                     <ref role="3cqZAo" node="3JXBM6C8cFx" resolve="_if" />
                   </node>
                   <node concept="3TrEf2" id="3JXBM6C8fyt" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpk" resolve="consequent" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpk" resolve="consequent_old" />
                   </node>
                 </node>
                 <node concept="zfrQC" id="3JXBM6C8fCx" role="2OqNvi" />
@@ -1178,7 +1190,7 @@
               <node concept="3cpWsn" id="3JXBM6C8jY1" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C8jY2" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C8jY3" role="33vP2m" />
               </node>
@@ -1187,12 +1199,12 @@
               <node concept="3cpWsn" id="3JXBM6C8jY5" role="3cpWs9">
                 <property role="TrG5h" value="iff" />
                 <node concept="3Tqbb2" id="3JXBM6C8jY6" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Frx" resolve="Iff" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C8jY7" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C8jY8" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C8jY9" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Frx" resolve="Iff" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
                   </node>
                 </node>
               </node>
@@ -1204,7 +1216,7 @@
                     <ref role="3cqZAo" node="3JXBM6C8jY5" resolve="iff" />
                   </node>
                   <node concept="3TrEf2" id="3JXBM6C8lqg" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrF" resolve="antecedent" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrF" resolve="antecedent_old" />
                   </node>
                 </node>
                 <node concept="2oxUTD" id="3JXBM6C8jYf" role="2OqNvi">
@@ -1221,7 +1233,7 @@
                     <ref role="3cqZAo" node="3JXBM6C8jY5" resolve="iff" />
                   </node>
                   <node concept="3TrEf2" id="3JXBM6C8lBM" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrG" resolve="consequent" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrG" resolve="consequent_old" />
                   </node>
                 </node>
                 <node concept="zfrQC" id="3JXBM6C8jYm" role="2OqNvi" />
@@ -1253,7 +1265,7 @@
               <node concept="3cpWsn" id="3JXBM6C7GZx" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C7GZy" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C7GZz" role="33vP2m" />
               </node>
@@ -1262,12 +1274,12 @@
               <node concept="3cpWsn" id="3JXBM6C7GZ_" role="3cpWs9">
                 <property role="TrG5h" value="and" />
                 <node concept="3Tqbb2" id="3JXBM6C7GZA" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3FnV" resolve="And" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C7GZB" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C7GZC" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C7GZD" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FnV" resolve="And" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
                   </node>
                 </node>
               </node>
@@ -1279,7 +1291,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7GZ_" resolve="and" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7GZP" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="WFELt" id="3JXBM6C7GZQ" role="2OqNvi" />
@@ -1292,7 +1304,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7GZ_" resolve="and" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7GZI" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="TSZUe" id="3JXBM6C7GZJ" role="2OqNvi">
@@ -1321,7 +1333,7 @@
               <node concept="3cpWsn" id="3JXBM6C7RN9" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C7RNa" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C7RNb" role="33vP2m" />
               </node>
@@ -1330,12 +1342,12 @@
               <node concept="3cpWsn" id="3JXBM6C7RNd" role="3cpWs9">
                 <property role="TrG5h" value="or" />
                 <node concept="3Tqbb2" id="3JXBM6C7RNe" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C7RNf" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C7RNg" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C7RNh" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
                   </node>
                 </node>
               </node>
@@ -1347,7 +1359,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7RNd" resolve="or" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7RNt" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="WFELt" id="3JXBM6C7RNu" role="2OqNvi" />
@@ -1360,7 +1372,7 @@
                     <ref role="3cqZAo" node="3JXBM6C7RNd" resolve="or" />
                   </node>
                   <node concept="3Tsc0h" id="3JXBM6C7RNm" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="TSZUe" id="3JXBM6C7RNn" role="2OqNvi">
@@ -1389,7 +1401,7 @@
               <node concept="3cpWsn" id="3JXBM6C814j" role="3cpWs9">
                 <property role="TrG5h" value="orig" />
                 <node concept="3Tqbb2" id="3JXBM6C814k" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
                 </node>
                 <node concept="7Obwk" id="3JXBM6C814l" role="33vP2m" />
               </node>
@@ -1398,12 +1410,12 @@
               <node concept="3cpWsn" id="3JXBM6C814n" role="3cpWs9">
                 <property role="TrG5h" value="not" />
                 <node concept="3Tqbb2" id="3JXBM6C814o" role="1tU5fm">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
                 </node>
                 <node concept="2OqwBi" id="3JXBM6C814p" role="33vP2m">
                   <node concept="7Obwk" id="3JXBM6C814q" role="2Oq$k0" />
                   <node concept="1_qnLN" id="3JXBM6C814r" role="2OqNvi">
-                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+                    <ref role="1_rbq0" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
                   </node>
                 </node>
               </node>
@@ -1415,7 +1427,7 @@
                     <ref role="3cqZAo" node="3JXBM6C814n" resolve="not" />
                   </node>
                   <node concept="3TrEf2" id="3JXBM6C81uc" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Cno" resolve="target" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Cno" resolve="target_old" />
                   </node>
                 </node>
                 <node concept="2oxUTD" id="3JXBM6C829D" role="2OqNvi">
@@ -1437,24 +1449,28 @@
   </node>
   <node concept="3p36aQ" id="3JXBM6C7X38">
     <property role="3GE5qa" value="sentence" />
-    <ref role="aqKnT" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
-    <node concept="3eGOop" id="3JXBM6C7X39" role="3ft7WO">
-      <node concept="ucgPf" id="3JXBM6C7X3a" role="3aKz83">
-        <node concept="3clFbS" id="3JXBM6C7X3b" role="2VODD2">
-          <node concept="3clFbF" id="3JXBM6C7X72" role="3cqZAp">
-            <node concept="2ShNRf" id="3JXBM6C7X70" role="3clFbG">
-              <node concept="3zrR0B" id="3JXBM6C7Xjl" role="2ShVmc">
-                <node concept="3Tqbb2" id="3JXBM6C7Xjn" role="3zrR0E">
-                  <ref role="ehGHo" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
+    <node concept="1X3_iC" id="4LBPYGUYJOT" role="lGtFl">
+      <property role="3V$3am" value="parts" />
+      <property role="3V$3ak" value="18bc6592-03a6-4e29-a83a-7ff23bde13ba/2000375450116454183/414384289274416996" />
+      <node concept="3eGOop" id="3JXBM6C7X39" role="8Wnug">
+        <node concept="ucgPf" id="3JXBM6C7X3a" role="3aKz83">
+          <node concept="3clFbS" id="3JXBM6C7X3b" role="2VODD2">
+            <node concept="3clFbF" id="3JXBM6C7X72" role="3cqZAp">
+              <node concept="2ShNRf" id="3JXBM6C7X70" role="3clFbG">
+                <node concept="3zrR0B" id="3JXBM6C7Xjl" role="2ShVmc">
+                  <node concept="3Tqbb2" id="3JXBM6C7Xjn" role="3zrR0E">
+                    <ref role="ehGHo" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
+                  </node>
                 </node>
               </node>
             </node>
           </node>
         </node>
-      </node>
-      <node concept="16NfWO" id="3JXBM6C7Xzs" role="upBLP">
-        <node concept="2h3Zct" id="3JXBM6C7XBu" role="16NeZM">
-          <property role="2h4Kg1" value="~" />
+        <node concept="16NfWO" id="3JXBM6C7Xzs" role="upBLP">
+          <node concept="2h3Zct" id="3JXBM6C7XBu" role="16NeZM">
+            <property role="2h4Kg1" value="~" />
+          </node>
         </node>
       </node>
     </node>
@@ -1462,7 +1478,7 @@
   <node concept="1h_SRR" id="3JXBM6C86ij">
     <property role="3GE5qa" value="sentence" />
     <property role="TrG5h" value="Not_Actions" />
-    <ref role="1h_SK9" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+    <ref role="1h_SK9" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
     <node concept="1hA7zw" id="3JXBM6C86ik" role="1h_SK8">
       <property role="1hAc7j" value="delete_action_id" />
       <node concept="1hAIg9" id="3JXBM6C86il" role="1hA7z_">
@@ -1474,7 +1490,7 @@
                 <node concept="2OqwBi" id="3JXBM6C86Vq" role="1P9ThW">
                   <node concept="0IXxy" id="3JXBM6C86MC" role="2Oq$k0" />
                   <node concept="3TrEf2" id="3JXBM6C87i1" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Cno" resolve="target" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3Cno" resolve="target_old" />
                   </node>
                 </node>
               </node>
@@ -1487,7 +1503,7 @@
   <node concept="1h_SRR" id="3JXBM6C8ul8">
     <property role="3GE5qa" value="sentence" />
     <property role="TrG5h" value="Or_Actions" />
-    <ref role="1h_SK9" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+    <ref role="1h_SK9" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
     <node concept="1hA7zw" id="3JXBM6C8ul9" role="1h_SK8">
       <property role="1hAc7j" value="delete_action_id" />
       <node concept="1hAIg9" id="3JXBM6C8ula" role="1hA7z_">
@@ -1496,13 +1512,13 @@
             <node concept="3cpWsn" id="3JXBM6C8HbS" role="3cpWs9">
               <property role="TrG5h" value="target" />
               <node concept="3Tqbb2" id="3JXBM6C8HbO" role="1tU5fm">
-                <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
               </node>
               <node concept="2OqwBi" id="3JXBM6C8HbT" role="33vP2m">
                 <node concept="2OqwBi" id="3JXBM6C8HbU" role="2Oq$k0">
                   <node concept="0IXxy" id="3JXBM6C8HbV" role="2Oq$k0" />
                   <node concept="3Tsc0h" id="3JXBM6C8HbW" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="1uHKPH" id="3JXBM6C8HbX" role="2OqNvi" />
@@ -1535,7 +1551,7 @@
                 <node concept="2OqwBi" id="3JXBM6C8uHv" role="2Oq$k0">
                   <node concept="0IXxy" id="3JXBM6C8usO" role="2Oq$k0" />
                   <node concept="3Tsc0h" id="3JXBM6C8uZP" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct_old" />
                   </node>
                 </node>
                 <node concept="34oBXx" id="3JXBM6C8ztE" role="2OqNvi" />
@@ -1549,7 +1565,7 @@
   <node concept="1h_SRR" id="3JXBM6C8NIn">
     <property role="3GE5qa" value="sentence" />
     <property role="TrG5h" value="And_Actions" />
-    <ref role="1h_SK9" to="jfgh:3JXBM6C3FnV" resolve="And" />
+    <ref role="1h_SK9" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
     <node concept="1hA7zw" id="3JXBM6C8NIo" role="1h_SK8">
       <property role="1hAc7j" value="delete_action_id" />
       <node concept="1hAIg9" id="3JXBM6C8NIp" role="1hA7z_">
@@ -1558,13 +1574,13 @@
             <node concept="3cpWsn" id="3JXBM6C8YI3" role="3cpWs9">
               <property role="TrG5h" value="target" />
               <node concept="3Tqbb2" id="3JXBM6C8YHX" role="1tU5fm">
-                <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence" />
+                <ref role="ehGHo" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
               </node>
               <node concept="2OqwBi" id="3JXBM6C8YI4" role="33vP2m">
                 <node concept="2OqwBi" id="3JXBM6C8YI5" role="2Oq$k0">
                   <node concept="0IXxy" id="3JXBM6C8YI6" role="2Oq$k0" />
                   <node concept="3Tsc0h" id="3JXBM6C8YI7" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="1uHKPH" id="3JXBM6C8YI8" role="2OqNvi" />
@@ -1597,7 +1613,7 @@
                 <node concept="2OqwBi" id="3JXBM6C8O2L" role="2Oq$k0">
                   <node concept="0IXxy" id="3JXBM6C8NPJ" role="2Oq$k0" />
                   <node concept="3Tsc0h" id="3JXBM6C8Olb" role="2OqNvi">
-                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                    <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct_old" />
                   </node>
                 </node>
                 <node concept="34oBXx" id="3JXBM6C8SN0" role="2OqNvi" />
@@ -1611,7 +1627,7 @@
   <node concept="1h_SRR" id="3JXBM6C9alP">
     <property role="3GE5qa" value="sentence" />
     <property role="TrG5h" value="If_Actions" />
-    <ref role="1h_SK9" to="jfgh:3JXBM6C3Fph" resolve="If" />
+    <ref role="1h_SK9" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
     <node concept="1hA7zw" id="3JXBM6C9alQ" role="1h_SK8">
       <property role="1hAc7j" value="delete_action_id" />
       <node concept="1hAIg9" id="3JXBM6C9alR" role="1hA7z_">
@@ -1624,7 +1640,7 @@
                   <node concept="2OqwBi" id="3JXBM6C9cE7" role="2Oq$k0">
                     <node concept="0IXxy" id="3JXBM6C9cxl" role="2Oq$k0" />
                     <node concept="3TrEf2" id="3JXBM6C9d2e" role="2OqNvi">
-                      <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpi" resolve="antecedent" />
+                      <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpi" resolve="antecedent_old" />
                     </node>
                   </node>
                   <node concept="3YRAZt" id="3JXBM6C9dKp" role="2OqNvi" />
@@ -1651,7 +1667,7 @@
   <node concept="1h_SRR" id="3JXBM6C9dQk">
     <property role="3GE5qa" value="sentence" />
     <property role="TrG5h" value="Iff_Actions" />
-    <ref role="1h_SK9" to="jfgh:3JXBM6C3Frx" resolve="Iff" />
+    <ref role="1h_SK9" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
     <node concept="1hA7zw" id="3JXBM6C9dQl" role="1h_SK8">
       <property role="1hAc7j" value="delete_action_id" />
       <node concept="1hAIg9" id="3JXBM6C9dQm" role="1hA7z_">
@@ -1663,7 +1679,7 @@
                 <node concept="2OqwBi" id="3JXBM6C9gce" role="1P9ThW">
                   <node concept="0IXxy" id="3JXBM6C9g3s" role="2Oq$k0" />
                   <node concept="3TrEf2" id="3JXBM6C9gps" role="2OqNvi">
-                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrF" resolve="antecedent" />
+                    <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrF" resolve="antecedent_old" />
                   </node>
                 </node>
               </node>
@@ -2198,5 +2214,20 @@
     </node>
     <node concept="3VyMlK" id="5jVx7S20VFl" role="3ft7WO" />
   </node>
+  <node concept="3p36aQ" id="4LBPYGUYJOh">
+    <ref role="aqKnT" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
+  </node>
+  <node concept="3p36aQ" id="4LBPYGUYJO_">
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
+  </node>
+  <node concept="3p36aQ" id="4LBPYGUYJOJ">
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
+  </node>
+  <node concept="3p36aQ" id="4LBPYGUYJP3">
+    <ref role="aqKnT" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
+  </node>
+  <node concept="3p36aQ" id="4LBPYGUYJPd">
+    <ref role="aqKnT" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
+  </node>
 </model>
 
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/migration.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/migration.mps
new file mode 100644
index 00000000..548d4790
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/migration.mps
@@ -0,0 +1,6684 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:b0d68e87-c19f-44c1-8fed-3b2c58e7ac98(jetbrains.mps.fitch.migration)">
+  <persistence version="9" />
+  <languages>
+    <use id="90746344-04fd-4286-97d5-b46ae6a81709" name="jetbrains.mps.lang.migration" version="0" />
+    <use id="9882f4ad-1955-46fe-8269-94189e5dbbf2" name="jetbrains.mps.lang.migration.util" version="0" />
+    <devkit ref="2677cb18-f558-4e33-bc38-a5139cee06dc(jetbrains.mps.devkit.language-design)" />
+  </languages>
+  <imports />
+  <registry>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="6911370362349121511" name="jetbrains.mps.lang.smodel.structure.ConceptId" flags="nn" index="2x4n5u">
+        <property id="6911370362349122519" name="conceptName" index="2x4mPI" />
+        <property id="6911370362349121516" name="conceptId" index="2x4n5l" />
+        <property id="6911370362349133804" name="isInterface" index="2x4o5l" />
+        <child id="6911370362349121514" name="languageIdentity" index="2x4n5j" />
+      </concept>
+      <concept id="8415841354032330471" name="jetbrains.mps.lang.smodel.structure.ContainmentLinkId" flags="ng" index="HUanS">
+        <property id="8415841354032330474" name="linkName" index="HUanP" />
+        <property id="8415841354032330473" name="linkId" index="HUanQ" />
+        <child id="8415841354032330472" name="conceptIdentity" index="HUanR" />
+      </concept>
+      <concept id="3542851458883438784" name="jetbrains.mps.lang.smodel.structure.LanguageId" flags="nn" index="2V$Bhx">
+        <property id="3542851458883439831" name="namespace" index="2V$B1Q" />
+        <property id="3542851458883439832" name="languageId" index="2V$B1T" />
+      </concept>
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+    <language id="90746344-04fd-4286-97d5-b46ae6a81709" name="jetbrains.mps.lang.migration">
+      <concept id="3116305438947623354" name="jetbrains.mps.lang.migration.structure.MoveContainmentLink" flags="ng" index="7a1rN">
+        <child id="8415841354033040054" name="targetId" index="HTpAD" />
+        <child id="8415841354033040053" name="sourceId" index="HTpAE" />
+      </concept>
+      <concept id="3116305438947623350" name="jetbrains.mps.lang.migration.structure.MoveConcept" flags="ng" index="7a1rZ">
+        <child id="8415841354030700269" name="targetId" index="HKsnM" />
+        <child id="8415841354030700266" name="sourceId" index="HKsnP" />
+      </concept>
+      <concept id="3116305438947553624" name="jetbrains.mps.lang.migration.structure.RefactoringPart" flags="ng" index="7amoh">
+        <property id="3628660716136424362" name="participant" index="hSBgo" />
+        <child id="3628660716136424366" name="finalState" index="hSBgs" />
+        <child id="3628660716136424364" name="initialState" index="hSBgu" />
+      </concept>
+      <concept id="2864063292004102367" name="jetbrains.mps.lang.migration.structure.ReflectionNodeReference" flags="ng" index="2pBcaW">
+        <property id="2864063292004102809" name="nodeName" index="2pBc3U" />
+        <property id="2864063292004103235" name="modelRef" index="2pBcow" />
+        <property id="2864063292004103247" name="nodeId" index="2pBcoG" />
+      </concept>
+      <concept id="7417095922908675018" name="jetbrains.mps.lang.migration.structure.MigrationScriptReference" flags="ng" index="2z5IEV">
+        <property id="7417095922909370996" name="module" index="2wV0G5" />
+        <property id="7417095922908725794" name="fromVersion" index="2z5Xdj" />
+      </concept>
+      <concept id="2015900981881695631" name="jetbrains.mps.lang.migration.structure.RefactoringLog" flags="ng" index="W$Crc">
+        <property id="2015900981881695633" name="fromVersion" index="W$Cri" />
+        <child id="2015900981881695634" name="part" index="W$Crh" />
+        <child id="3597905718825595708" name="options" index="1w76sc" />
+      </concept>
+      <concept id="7431903976166007326" name="jetbrains.mps.lang.migration.structure.MoveNodeMigrationPart" flags="ng" index="Z4OXk">
+        <child id="3116305438947564633" name="specialization" index="7agGg" />
+        <child id="7431903976166276375" name="toNode" index="Z5P1t" />
+        <child id="7431903976166276373" name="fromNode" index="Z5P1v" />
+      </concept>
+      <concept id="7431903976166443707" name="jetbrains.mps.lang.migration.structure.PureMigrationScript" flags="ng" index="Z5qvL">
+        <property id="7431903976166443708" name="fromVersion" index="Z5qvQ" />
+        <child id="7431903976166447091" name="part" index="Z5rET" />
+      </concept>
+      <concept id="3897914186547825813" name="jetbrains.mps.lang.migration.structure.ConceptMigrationReference" flags="ng" index="30eU3p">
+        <child id="3897914186547825817" name="oldConcept" index="30eU3l" />
+        <child id="3897914186547825814" name="migrationScript" index="30eU3q" />
+      </concept>
+      <concept id="3597905718825595712" name="jetbrains.mps.lang.migration.structure.RefactoringOptions" flags="ng" index="1w76tK">
+        <child id="3597905718825595718" name="options" index="1w76tQ" />
+      </concept>
+      <concept id="3597905718825595715" name="jetbrains.mps.lang.migration.structure.RefactoringOption" flags="ng" index="1w76tN">
+        <property id="3597905718825595716" name="optionId" index="1w76tO" />
+        <property id="3597905718825650036" name="description" index="1w7ld4" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="W$Crc" id="4LBPYGUYJw4">
+    <property role="3GE5qa" value="refactoring" />
+    <property role="W$Cri" value="0" />
+    <property role="TrG5h" value="RefactoringLog_0" />
+    <node concept="1w76tK" id="4LBPYGUYJw5" role="1w76sc">
+      <node concept="1w76tN" id="4LBPYGUYJw6" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.handleSubconcepts" />
+        <property role="1w7ld4" value="Handle subconcepts" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJw7" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.moveConceptAspects" />
+        <property role="1w7ld4" value="Move concept aspects" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJw8" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.updateLocalInstances" />
+        <property role="1w7ld4" value="Update instances in current project" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJw9" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.updateModelImports" />
+        <property role="1w7ld4" value="Update model imports" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJwa" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.updateReferencesParticipant" />
+        <property role="1w7ld4" value="Update references" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJwb" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.writeMigrationScript" />
+        <property role="1w7ld4" value="Write migration script" />
+      </node>
+      <node concept="1w76tN" id="4LBPYGUYJwc" role="1w76tQ">
+        <property role="1w76tO" value="moveNode.options.writeRefactoringLog" />
+        <property role="1w7ld4" value="Write refactoring log" />
+      </node>
+    </node>
+    <node concept="7amoh" id="4LBPYGUYJwe" role="W$Crh">
+      <property role="hSBgo" value="moveNode.updateReferences" />
+      <node concept="2pBcaW" id="4LBPYGUYJo0" role="hSBgu">
+        <property role="2pBcoG" value="4322786184247817726" />
+        <property role="2pBcow" value="r:873e37f0-b045-47b9-ae9e-db79c2628975(jetbrains.mps.fitch.editor)" />
+        <property role="2pBc3U" value="And_Editor" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJwd" role="hSBgs">
+        <property role="2pBcoG" value="4322786184247817726" />
+        <property role="2pBcow" value="r:2ca623f4-8f74-473f-b3b6-e9b637018c0b(jetbrains.mps.logic.propositional.editor)" />
+        <property role="2pBc3U" value="And_Editor" />
+      </node>
+    </node>
+    <node concept="7amoh" id="4LBPYGUYJwg" role="W$Crh">
+      <property role="hSBgo" value="moveNode.updateReferences" />
+      <node concept="2pBcaW" id="4LBPYGUYJo1" role="hSBgu">
+        <property role="2pBcoG" value="4322786184247817728" />
+        <property role="2pBcow" value="r:873e37f0-b045-47b9-ae9e-db79c2628975(jetbrains.mps.fitch.editor)" />
+        <property role="2pBc3U" value="CellModel_Collection@48404" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJwf" role="hSBgs">
+        <property role="2pBcoG" value="4322786184247817728" />
+        <property role="2pBcow" value="r:2ca623f4-8f74-473f-b3b6-e9b637018c0b(jetbrains.mps.logic.propositional.editor)" />
+        <property role="2pBc3U" value="CellModel_Collection@48404" />
+      </node>
+    </node>
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+        <property role="2pBc3U" value="antecedent" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJPD" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJPz" role="HTpAE">
+          <property role="HUanP" value="antecedent" />
+          <property role="HUanQ" value="wubvt9x9cs42" />
+          <node concept="2x4n5u" id="4LBPYGUYJP$" role="HUanR">
+            <property role="2x4mPI" value="If" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs41" />
+            <node concept="2V$Bhx" id="4LBPYGUYJP_" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJPA" role="HTpAD">
+          <property role="HUanP" value="antecedent" />
+          <property role="HUanQ" value="wubvt9x9cs42" />
+          <node concept="2x4n5u" id="4LBPYGUYJPB" role="HUanR">
+            <property role="2x4mPI" value="If" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs41" />
+            <node concept="2V$Bhx" id="4LBPYGUYJPC" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="Z4OXk" id="4LBPYGUYJPR" role="Z5rET">
+      <node concept="2pBcaW" id="4LBPYGUYJPP" role="Z5P1v">
+        <property role="2pBcoG" value="4322786184247817812" />
+        <property role="2pBcow" value="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+        <property role="2pBc3U" value="consequent_old" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJPQ" role="Z5P1t">
+        <property role="2pBcoG" value="4322786184247817812" />
+        <property role="2pBcow" value="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+        <property role="2pBc3U" value="consequent" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJPO" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJPI" role="HTpAE">
+          <property role="HUanP" value="consequent" />
+          <property role="HUanQ" value="wubvt9x9cs44" />
+          <node concept="2x4n5u" id="4LBPYGUYJPJ" role="HUanR">
+            <property role="2x4mPI" value="If" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs41" />
+            <node concept="2V$Bhx" id="4LBPYGUYJPK" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJPL" role="HTpAD">
+          <property role="HUanP" value="consequent" />
+          <property role="HUanQ" value="wubvt9x9cs44" />
+          <node concept="2x4n5u" id="4LBPYGUYJPM" role="HUanR">
+            <property role="2x4mPI" value="If" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs41" />
+            <node concept="2V$Bhx" id="4LBPYGUYJPN" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="Z4OXk" id="4LBPYGUYJQ2" role="Z5rET">
+      <node concept="2pBcaW" id="4LBPYGUYJQ0" role="Z5P1v">
+        <property role="2pBcoG" value="4322786184247817963" />
+        <property role="2pBcow" value="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+        <property role="2pBc3U" value="antecedent_old" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJQ1" role="Z5P1t">
+        <property role="2pBcoG" value="4322786184247817963" />
+        <property role="2pBcow" value="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+        <property role="2pBc3U" value="antecedent" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJPZ" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJPT" role="HTpAE">
+          <property role="HUanP" value="antecedent" />
+          <property role="HUanQ" value="wubvt9x9cs8b" />
+          <node concept="2x4n5u" id="4LBPYGUYJPU" role="HUanR">
+            <property role="2x4mPI" value="Iff" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs81" />
+            <node concept="2V$Bhx" id="4LBPYGUYJPV" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJPW" role="HTpAD">
+          <property role="HUanP" value="antecedent" />
+          <property role="HUanQ" value="wubvt9x9cs8b" />
+          <node concept="2x4n5u" id="4LBPYGUYJPX" role="HUanR">
+            <property role="2x4mPI" value="Iff" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs81" />
+            <node concept="2V$Bhx" id="4LBPYGUYJPY" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="Z4OXk" id="4LBPYGUYJQd" role="Z5rET">
+      <node concept="2pBcaW" id="4LBPYGUYJQb" role="Z5P1v">
+        <property role="2pBcoG" value="4322786184247817964" />
+        <property role="2pBcow" value="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+        <property role="2pBc3U" value="consequent_old" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJQc" role="Z5P1t">
+        <property role="2pBcoG" value="4322786184247817964" />
+        <property role="2pBcow" value="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+        <property role="2pBc3U" value="consequent" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJQa" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJQ4" role="HTpAE">
+          <property role="HUanP" value="consequent" />
+          <property role="HUanQ" value="wubvt9x9cs8c" />
+          <node concept="2x4n5u" id="4LBPYGUYJQ5" role="HUanR">
+            <property role="2x4mPI" value="Iff" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs81" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQ6" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJQ7" role="HTpAD">
+          <property role="HUanP" value="consequent" />
+          <property role="HUanQ" value="wubvt9x9cs8c" />
+          <node concept="2x4n5u" id="4LBPYGUYJQ8" role="HUanR">
+            <property role="2x4mPI" value="Iff" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs81" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQ9" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="Z4OXk" id="4LBPYGUYJQo" role="Z5rET">
+      <node concept="2pBcaW" id="4LBPYGUYJQm" role="Z5P1v">
+        <property role="2pBcoG" value="4322786184247805400" />
+        <property role="2pBcow" value="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+        <property role="2pBc3U" value="target_old" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJQn" role="Z5P1t">
+        <property role="2pBcoG" value="4322786184247805400" />
+        <property role="2pBcow" value="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+        <property role="2pBc3U" value="target" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJQl" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJQf" role="HTpAE">
+          <property role="HUanP" value="target" />
+          <property role="HUanQ" value="wubvt9x9cijc" />
+          <node concept="2x4n5u" id="4LBPYGUYJQg" role="HUanR">
+            <property role="2x4mPI" value="Not" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cijb" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQh" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJQi" role="HTpAD">
+          <property role="HUanP" value="target" />
+          <property role="HUanQ" value="wubvt9x9cijc" />
+          <node concept="2x4n5u" id="4LBPYGUYJQj" role="HUanR">
+            <property role="2x4mPI" value="Not" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cijb" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQk" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+    <node concept="Z4OXk" id="4LBPYGUYJQz" role="Z5rET">
+      <node concept="2pBcaW" id="4LBPYGUYJQx" role="Z5P1v">
+        <property role="2pBcoG" value="4322786184247817796" />
+        <property role="2pBcow" value="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+        <property role="2pBc3U" value="disjunct_old" />
+      </node>
+      <node concept="2pBcaW" id="4LBPYGUYJQy" role="Z5P1t">
+        <property role="2pBcoG" value="4322786184247817796" />
+        <property role="2pBcow" value="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+        <property role="2pBc3U" value="disjunct" />
+      </node>
+      <node concept="7a1rN" id="4LBPYGUYJQw" role="7agGg">
+        <node concept="HUanS" id="4LBPYGUYJQq" role="HTpAE">
+          <property role="HUanP" value="disjunct" />
+          <property role="HUanQ" value="wubvt9x9cs3o" />
+          <node concept="2x4n5u" id="4LBPYGUYJQr" role="HUanR">
+            <property role="2x4mPI" value="Or" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs2u" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQs" role="2x4n5j">
+              <property role="2V$B1T" value="06b7c5c7-e359-4f4b-a581-5d0c9323af39" />
+              <property role="2V$B1Q" value="jetbrains.mps.fitch" />
+            </node>
+          </node>
+        </node>
+        <node concept="HUanS" id="4LBPYGUYJQt" role="HTpAD">
+          <property role="HUanP" value="disjunct" />
+          <property role="HUanQ" value="wubvt9x9cs3o" />
+          <node concept="2x4n5u" id="4LBPYGUYJQu" role="HUanR">
+            <property role="2x4mPI" value="Or" />
+            <property role="2x4o5l" value="false" />
+            <property role="2x4n5l" value="wubvt9x9cs2u" />
+            <node concept="2V$Bhx" id="4LBPYGUYJQv" role="2x4n5j">
+              <property role="2V$B1T" value="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" />
+              <property role="2V$B1Q" value="jetbrains.mps.logic.propositional" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
index 6f3c248a..5208f518 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/structure.mps
@@ -6,10 +6,14 @@
     <devkit ref="78434eb8-b0e5-444b-850d-e7c4ad2da9ab(jetbrains.mps.devkit.aspect.structure)" />
   </languages>
   <imports>
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
   </imports>
   <registry>
     <language id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure">
+      <concept id="1224240836180" name="jetbrains.mps.lang.structure.structure.DeprecatedNodeAnnotation" flags="ig" index="asaX9">
+        <property id="1225118933224" name="comment" index="YLQ7P" />
+      </concept>
       <concept id="1169125787135" name="jetbrains.mps.lang.structure.structure.AbstractConceptDeclaration" flags="ig" index="PkWjJ">
         <property id="6714410169261853888" name="conceptId" index="EcuMT" />
         <property id="4628067390765907488" name="conceptShortDescription" index="R4oN_" />
@@ -45,6 +49,7 @@
     <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
       <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
         <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+        <child id="5169995583184591170" name="smodelAttribute" index="lGtFl" />
       </concept>
       <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
         <property id="1169194664001" name="name" index="TrG5h" />
@@ -53,20 +58,23 @@
   </registry>
   <node concept="1TIwiD" id="3JXBM6C3Cn8">
     <property role="EcuMT" value="4322786184247805384" />
-    <property role="TrG5h" value="Constant" />
+    <property role="TrG5h" value="Constant_old" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Constant" />
     <ref role="1TJDcQ" to="tpck:gw2VY9q" resolve="BaseConcept" />
     <node concept="PrWs8" id="3JXBM6C3Fso" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
     </node>
     <node concept="PrWs8" id="3JXBM6C3Cn9" role="PzmwI">
       <ref role="PrY4T" to="tpck:h0TrEE$" resolve="INamedConcept" />
     </node>
+    <node concept="asaX9" id="4LBPYGUYJOq" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
+    </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3Cnn">
     <property role="EcuMT" value="4322786184247805399" />
-    <property role="TrG5h" value="Not" />
+    <property role="TrG5h" value="Not_old" />
     <property role="34LRSv" value="not" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Negation" />
@@ -74,22 +82,31 @@
     <node concept="1TJgyj" id="3JXBM6C3Cno" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247805400" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="target" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="target_old" />
+      <property role="20lbJX" value="0..1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJQe" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.Not&quot;" />
+      </node>
     </node>
     <node concept="PrWs8" id="3JXBM6C3Fsw" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="asaX9" id="4LBPYGUYJOS" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
     </node>
   </node>
   <node concept="PlHQZ" id="3JXBM6C3Cnq">
     <property role="EcuMT" value="4322786184247805402" />
-    <property role="TrG5h" value="Sentence" />
+    <property role="TrG5h" value="Sentence_old" />
     <property role="3GE5qa" value="sentence" />
+    <node concept="asaX9" id="4LBPYGUYJPc" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
+    </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3FnV">
     <property role="EcuMT" value="4322786184247817723" />
-    <property role="TrG5h" value="And" />
+    <property role="TrG5h" value="And_old" />
     <property role="34LRSv" value="and" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Conjunction" />
@@ -97,17 +114,23 @@
     <node concept="1TJgyj" id="3JXBM6C3FnW" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817724" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="conjunct" />
-      <property role="20lbJX" value="1..n" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="conjunct_old" />
+      <property role="20lbJX" value="0..n" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJPn" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.And&quot;" />
+      </node>
     </node>
     <node concept="PrWs8" id="3JXBM6C3Fsj" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="asaX9" id="4LBPYGUYJOg" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
     </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3FoA">
     <property role="EcuMT" value="4322786184247817766" />
-    <property role="TrG5h" value="Or" />
+    <property role="TrG5h" value="Or_old" />
     <property role="34LRSv" value="or" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Disjunction" />
@@ -115,17 +138,23 @@
     <node concept="1TJgyj" id="3JXBM6C3Fp4" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817796" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="disjunct" />
-      <property role="20lbJX" value="1..n" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="disjunct_old" />
+      <property role="20lbJX" value="0..n" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJQp" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.Or&quot;" />
+      </node>
     </node>
     <node concept="PrWs8" id="3JXBM6C3Fsy" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="asaX9" id="4LBPYGUYJP2" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
     </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3Fph">
     <property role="EcuMT" value="4322786184247817809" />
-    <property role="TrG5h" value="If" />
+    <property role="TrG5h" value="If_old" />
     <property role="34LRSv" value="if" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Implication" />
@@ -133,24 +162,33 @@
     <node concept="1TJgyj" id="3JXBM6C3Fpi" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817810" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="antecedent" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="antecedent_old" />
+      <property role="20lbJX" value="0..1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJPy" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.If&quot;" />
+      </node>
     </node>
     <node concept="1TJgyj" id="3JXBM6C3Fpk" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817812" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="consequent" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="consequent_old" />
+      <property role="20lbJX" value="0..1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJPH" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.If&quot;" />
+      </node>
     </node>
     <node concept="PrWs8" id="3JXBM6C3Fss" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="asaX9" id="4LBPYGUYJO$" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
     </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3Frx">
     <property role="EcuMT" value="4322786184247817953" />
-    <property role="TrG5h" value="Iff" />
+    <property role="TrG5h" value="Iff_old" />
     <property role="34LRSv" value="iff" />
     <property role="3GE5qa" value="sentence" />
     <property role="R4oN_" value="Biconditional" />
@@ -158,19 +196,28 @@
     <node concept="1TJgyj" id="3JXBM6C3FrF" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817963" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="antecedent" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="antecedent_old" />
+      <property role="20lbJX" value="0..1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJPS" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.Iff&quot;" />
+      </node>
     </node>
     <node concept="1TJgyj" id="3JXBM6C3FrG" role="1TKVEi">
       <property role="IQ2ns" value="4322786184247817964" />
       <property role="20lmBu" value="aggregation" />
-      <property role="20kJfa" value="consequent" />
-      <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <property role="20kJfa" value="consequent_old" />
+      <property role="20lbJX" value="0..1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence_old" />
+      <node concept="asaX9" id="4LBPYGUYJQ3" role="lGtFl">
+        <property role="YLQ7P" value="The link was moved to concept &quot;jetbrains.mps.logic.propositional.structure.Iff&quot;" />
+      </node>
     </node>
     <node concept="PrWs8" id="3JXBM6C3Fsu" role="PzmwI">
-      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="PrY4T" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="asaX9" id="4LBPYGUYJOI" role="lGtFl">
+      <property role="YLQ7P" value="The concept was moved to language &quot;jetbrains.mps.logic.propositional&quot;" />
     </node>
   </node>
   <node concept="1TIwiD" id="3JXBM6C3Fs$">
@@ -245,7 +292,7 @@
       <property role="20lmBu" value="aggregation" />
       <property role="20kJfa" value="conclusion" />
       <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="20lvS9" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
     </node>
     <node concept="PrWs8" id="3JXBM6C4o1Q" role="PrDN$">
       <ref role="PrY4T" node="3JXBM6C4ntZ" resolve="Leaf" />
@@ -417,7 +464,7 @@
       <property role="20lmBu" value="aggregation" />
       <property role="20kJfa" value="sentence" />
       <property role="20lbJX" value="1" />
-      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+      <ref role="20lvS9" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
     </node>
   </node>
   <node concept="1TIwiD" id="2aBGSFge6pw">
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps b/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
index 713649b0..5a1d554c 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/models/types.mps
@@ -7,6 +7,7 @@
   </languages>
   <imports>
     <import index="jfgh" ref="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
     <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" implicit="true" />
   </imports>
   <registry>
@@ -359,7 +360,7 @@
       <node concept="3eYOCq" id="5RfK0kxl0WG" role="3eYTkm">
         <property role="TrG5h" value="cst" />
         <node concept="3Tqbb2" id="5RfK0kxl0WH" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3Cn8" resolve="Constant" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3Cn8" resolve="Constant" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxl0X2" role="3unh6L">
@@ -402,7 +403,7 @@
                   <ref role="3eTFj1" node="5RfK0kxl0WS" resolve="and" />
                 </node>
                 <node concept="3Tsc0h" id="5RfK0kxl2rm" role="2OqNvi">
-                  <ref role="3TtcxE" to="jfgh:3JXBM6C3FnW" resolve="conjunct" />
+                  <ref role="3TtcxE" to="27wh:3JXBM6C3FnW" resolve="conjunct" />
                 </node>
               </node>
             </node>
@@ -412,7 +413,7 @@
       <node concept="3eYOCq" id="5RfK0kxl0WS" role="3eYTkm">
         <property role="TrG5h" value="and" />
         <node concept="3Tqbb2" id="5RfK0kxl0WT" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3FnV" resolve="And" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3FnV" resolve="And" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxl2u5" role="3unh6L">
@@ -522,7 +523,7 @@
                   <ref role="3eTFj1" node="5RfK0kxld9p" resolve="or" />
                 </node>
                 <node concept="3Tsc0h" id="5RfK0kxldOt" role="2OqNvi">
-                  <ref role="3TtcxE" to="jfgh:3JXBM6C3Fp4" resolve="disjunct" />
+                  <ref role="3TtcxE" to="27wh:3JXBM6C3Fp4" resolve="disjunct" />
                 </node>
               </node>
             </node>
@@ -532,7 +533,7 @@
       <node concept="3eYOCq" id="5RfK0kxld9p" role="3eYTkm">
         <property role="TrG5h" value="or" />
         <node concept="3Tqbb2" id="5RfK0kxld9q" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3FoA" resolve="Or" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3FoA" resolve="Or" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxld9r" role="3unh6L">
@@ -642,7 +643,7 @@
                   <ref role="3eTFj1" node="5RfK0kxlwbs" resolve="not" />
                 </node>
                 <node concept="3TrEf2" id="5RfK0kxlwAU" role="2OqNvi">
-                  <ref role="3Tt5mk" to="jfgh:3JXBM6C3Cno" resolve="target" />
+                  <ref role="3Tt5mk" to="27wh:3JXBM6C3Cno" resolve="target" />
                 </node>
               </node>
             </node>
@@ -652,7 +653,7 @@
       <node concept="3eYOCq" id="5RfK0kxlwbs" role="3eYTkm">
         <property role="TrG5h" value="not" />
         <node concept="3Tqbb2" id="5RfK0kxlwbt" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3Cnn" resolve="Not" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3Cnn" resolve="Not" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxlwDE" role="3unh6L">
@@ -712,7 +713,7 @@
                   <ref role="3eTFj1" node="5RfK0kxlwHw" resolve="_if" />
                 </node>
                 <node concept="3TrEf2" id="5RfK0kxlxgC" role="2OqNvi">
-                  <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpi" resolve="antecedent" />
+                  <ref role="3Tt5mk" to="27wh:3JXBM6C3Fpi" resolve="antecedent" />
                 </node>
               </node>
             </node>
@@ -730,7 +731,7 @@
                   <ref role="3eTFj1" node="5RfK0kxlwHw" resolve="_if" />
                 </node>
                 <node concept="3TrEf2" id="5RfK0kxlxE1" role="2OqNvi">
-                  <ref role="3Tt5mk" to="jfgh:3JXBM6C3Fpk" resolve="consequent" />
+                  <ref role="3Tt5mk" to="27wh:3JXBM6C3Fpk" resolve="consequent" />
                 </node>
               </node>
             </node>
@@ -740,7 +741,7 @@
       <node concept="3eYOCq" id="5RfK0kxlwHw" role="3eYTkm">
         <property role="TrG5h" value="_if" />
         <node concept="3Tqbb2" id="5RfK0kxlwHx" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3Fph" resolve="If" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3Fph" resolve="If" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxlxIw" role="3unh6L">
@@ -827,7 +828,7 @@
                   <ref role="3eTFj1" node="5RfK0kxly6R" resolve="iff" />
                 </node>
                 <node concept="3TrEf2" id="5RfK0kxlyLG" role="2OqNvi">
-                  <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrF" resolve="antecedent" />
+                  <ref role="3Tt5mk" to="27wh:3JXBM6C3FrF" resolve="antecedent" />
                 </node>
               </node>
             </node>
@@ -845,7 +846,7 @@
                   <ref role="3eTFj1" node="5RfK0kxly6R" resolve="iff" />
                 </node>
                 <node concept="3TrEf2" id="5RfK0kxlyZr" role="2OqNvi">
-                  <ref role="3Tt5mk" to="jfgh:3JXBM6C3FrG" resolve="consequent" />
+                  <ref role="3Tt5mk" to="27wh:3JXBM6C3FrG" resolve="consequent" />
                 </node>
               </node>
             </node>
@@ -855,7 +856,7 @@
       <node concept="3eYOCq" id="5RfK0kxly6R" role="3eYTkm">
         <property role="TrG5h" value="iff" />
         <node concept="3Tqbb2" id="5RfK0kxly6S" role="3eYSA1">
-          <ref role="ehGHo" to="jfgh:3JXBM6C3Frx" resolve="Iff" />
+          <ref role="ehGHo" to="27wh:3JXBM6C3Frx" resolve="Iff" />
         </node>
       </node>
       <node concept="3uniRm" id="5RfK0kxly6T" role="3unh6L">
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/sandbox/jetbrains.mps.fitch.sandbox.msd b/samples/fitch/languages/jetbrains.mps.fitch/sandbox/jetbrains.mps.fitch.sandbox.msd
index 14c23211..7e8b5e65 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/sandbox/jetbrains.mps.fitch.sandbox.msd
+++ b/samples/fitch/languages/jetbrains.mps.fitch/sandbox/jetbrains.mps.fitch.sandbox.msd
@@ -7,8 +7,9 @@
   </models>
   <sourcePath />
   <languageVersions>
-    <language slang="l:06b7c5c7-e359-4f4b-a581-5d0c9323af39:jetbrains.mps.fitch" version="0" />
+    <language slang="l:06b7c5c7-e359-4f4b-a581-5d0c9323af39:jetbrains.mps.fitch" version="1" />
     <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="1" />
+    <language slang="l:ec79e64d-4cbb-4f6c-b7b7-108dd125aba6:jetbrains.mps.logic.propositional" version="-1" />
   </languageVersions>
   <dependencyVersions>
     <module reference="86925f4e-7856-4553-a261-c86fbf09bb52(jetbrains.mps.fitch.sandbox)" version="0" />
diff --git a/samples/fitch/languages/jetbrains.mps.fitch/sandbox/models/jetbrains.mps.fitch.sandbox.mps b/samples/fitch/languages/jetbrains.mps.fitch/sandbox/models/jetbrains.mps.fitch.sandbox.mps
index eb2a203a..c7717707 100644
--- a/samples/fitch/languages/jetbrains.mps.fitch/sandbox/models/jetbrains.mps.fitch.sandbox.mps
+++ b/samples/fitch/languages/jetbrains.mps.fitch/sandbox/models/jetbrains.mps.fitch.sandbox.mps
@@ -2,10 +2,31 @@
 <model ref="r:ff7f5a29-d9b8-40f0-b446-35696305dff0(jetbrains.mps.fitch.sandbox)">
   <persistence version="9" />
   <languages>
-    <use id="06b7c5c7-e359-4f4b-a581-5d0c9323af39" name="jetbrains.mps.fitch" version="0" />
+    <use id="06b7c5c7-e359-4f4b-a581-5d0c9323af39" name="jetbrains.mps.fitch" version="1" />
+    <use id="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" name="jetbrains.mps.logic.propositional" version="-1" />
   </languages>
   <imports />
   <registry>
+    <language id="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" name="jetbrains.mps.logic.propositional">
+      <concept id="4322786184247805384" name="jetbrains.mps.logic.propositional.structure.Constant" flags="ng" index="2jWLFD" />
+      <concept id="4322786184247805399" name="jetbrains.mps.logic.propositional.structure.Not" flags="ng" index="2jWLFQ">
+        <child id="4322786184247805400" name="target" index="2jWLFT" />
+      </concept>
+      <concept id="4322786184247817766" name="jetbrains.mps.logic.propositional.structure.Or" flags="ng" index="2jWM$7">
+        <child id="4322786184247817796" name="disjunct" index="2jWM__" />
+      </concept>
+      <concept id="4322786184247817809" name="jetbrains.mps.logic.propositional.structure.If" flags="ng" index="2jWM_K">
+        <child id="4322786184247817810" name="antecedent" index="2jWM_N" />
+        <child id="4322786184247817812" name="consequent" index="2jWM_P" />
+      </concept>
+      <concept id="4322786184247817953" name="jetbrains.mps.logic.propositional.structure.Iff" flags="ng" index="2jWMB0">
+        <child id="4322786184247817963" name="antecedent" index="2jWMBa" />
+        <child id="4322786184247817964" name="consequent" index="2jWMBd" />
+      </concept>
+      <concept id="4322786184247817723" name="jetbrains.mps.logic.propositional.structure.And" flags="ng" index="2jWMFq">
+        <child id="4322786184247817724" name="conjunct" index="2jWMFt" />
+      </concept>
+    </language>
     <language id="06b7c5c7-e359-4f4b-a581-5d0c9323af39" name="jetbrains.mps.fitch">
       <concept id="4322786184247881315" name="jetbrains.mps.fitch.structure.AndElim" flags="ng" index="2jWz52" />
       <concept id="4322786184247881317" name="jetbrains.mps.fitch.structure.OrElim" flags="ng" index="2jWz54" />
@@ -24,10 +45,6 @@
       <concept id="4322786184247854968" name="jetbrains.mps.fitch.structure.Reasoning" flags="ng" index="2jWHxp">
         <child id="2497161927181071993" name="conclusion" index="3MT$nN" />
       </concept>
-      <concept id="4322786184247805384" name="jetbrains.mps.fitch.structure.Constant" flags="ng" index="2jWLFD" />
-      <concept id="4322786184247805399" name="jetbrains.mps.fitch.structure.Not" flags="ng" index="2jWLFQ">
-        <child id="4322786184247805400" name="target" index="2jWLFT" />
-      </concept>
       <concept id="4322786184247818020" name="jetbrains.mps.fitch.structure.Proof" flags="ng" index="2jWMw5">
         <property id="2994859399702197792" name="description" index="26WHrx" />
         <child id="4322786184248036774" name="content" index="2jVTa7" />
@@ -39,20 +56,6 @@
       <concept id="4322786184247818035" name="jetbrains.mps.fitch.structure.Basis" flags="ng" index="2jWMwi">
         <reference id="4322786184247818157" name="reasoning" index="2jWMyc" />
       </concept>
-      <concept id="4322786184247817766" name="jetbrains.mps.fitch.structure.Or" flags="ng" index="2jWM$7">
-        <child id="4322786184247817796" name="disjunct" index="2jWM__" />
-      </concept>
-      <concept id="4322786184247817809" name="jetbrains.mps.fitch.structure.If" flags="ng" index="2jWM_K">
-        <child id="4322786184247817810" name="antecedent" index="2jWM_N" />
-        <child id="4322786184247817812" name="consequent" index="2jWM_P" />
-      </concept>
-      <concept id="4322786184247817953" name="jetbrains.mps.fitch.structure.Iff" flags="ng" index="2jWMB0">
-        <child id="4322786184247817963" name="antecedent" index="2jWMBa" />
-        <child id="4322786184247817964" name="consequent" index="2jWMBd" />
-      </concept>
-      <concept id="4322786184247817723" name="jetbrains.mps.fitch.structure.And" flags="ng" index="2jWMFq">
-        <child id="4322786184247817724" name="conjunct" index="2jWMFt" />
-      </concept>
       <concept id="657004910291123662" name="jetbrains.mps.fitch.structure.Premise" flags="ng" index="GydIM" />
       <concept id="657004910291159432" name="jetbrains.mps.fitch.structure.Goal" flags="ng" index="GyqZO">
         <child id="657004910291159433" name="sentence" index="GyqZP" />
@@ -187,11 +190,6 @@
     </node>
     <node concept="2jWAjC" id="$u9BK_y$oJ" role="2jVTa7">
       <node concept="2jWM_K" id="$u9BK_y$q$" role="3MT$nN">
-        <node concept="2jWLFQ" id="$u9BK_y$xn" role="2jWM_P">
-          <node concept="2jWLFD" id="$u9BK_y$xp" role="2jWLFT">
-            <property role="TrG5h" value="p" />
-          </node>
-        </node>
         <node concept="2jWLFQ" id="$u9BK_y$v0" role="2jWM_N">
           <node concept="2jWM$7" id="$u9BK_y$qb" role="2jWLFT">
             <node concept="2jWLFD" id="$u9BK_y$q8" role="2jWM__">
@@ -204,6 +202,11 @@
             </node>
           </node>
         </node>
+        <node concept="2jWLFQ" id="$u9BK_y$xn" role="2jWM_P">
+          <node concept="2jWLFD" id="$u9BK_y$xp" role="2jWLFT">
+            <property role="TrG5h" value="p" />
+          </node>
+        </node>
       </node>
       <node concept="2jWMwi" id="2AfSc6JviTm" role="2jWFax">
         <ref role="2jWMyc" node="$u9BK_y$0J" />
@@ -346,9 +349,6 @@
     </node>
     <node concept="2jWAjC" id="$u9BK_y$yx" role="2jVTa7">
       <node concept="2jWM_K" id="$u9BK_y$y$" role="3MT$nN">
-        <node concept="2jWLFD" id="$u9BK_y$yA" role="2jWM_P">
-          <property role="TrG5h" value="p" />
-        </node>
         <node concept="2jWLFQ" id="$u9BK_y$yB" role="2jWM_N">
           <node concept="2jWM$7" id="$u9BK_y$yC" role="2jWLFT">
             <node concept="2jWLFD" id="$u9BK_y$yD" role="2jWM__">
@@ -361,6 +361,9 @@
             </node>
           </node>
         </node>
+        <node concept="2jWLFD" id="$u9BK_y$yA" role="2jWM_P">
+          <property role="TrG5h" value="p" />
+        </node>
       </node>
       <node concept="2jWMwi" id="2AfSc6JviTz" role="2jWFax">
         <ref role="2jWMyc" node="$u9BK_y$yG" />
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/generator/template/main@generator.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/generator/template/main@generator.mps
new file mode 100644
index 00000000..0729410f
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/generator/template/main@generator.mps
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:719e61c3-9081-4fd0-a588-d1fefcee8cec(main@generator)">
+  <persistence version="9" />
+  <languages>
+    <devkit ref="a2eb3a43-fcc2-4200-80dc-c60110c4862d(jetbrains.mps.devkit.templates)" />
+  </languages>
+  <imports>
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+  </imports>
+  <registry>
+    <language id="b401a680-8325-4110-8fd3-84331ff25bef" name="jetbrains.mps.lang.generator">
+      <concept id="1095416546421" name="jetbrains.mps.lang.generator.structure.MappingConfiguration" flags="ig" index="bUwia" />
+    </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">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="bUwia" id="4LBPYGUYJdA">
+    <property role="TrG5h" value="main" />
+  </node>
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl b/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl
new file mode 100644
index 00000000..18f0cdc1
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/jetbrains.mps.logic.propositional.mpl
@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<language namespace="jetbrains.mps.logic.propositional" uuid="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6" languageVersion="0" moduleVersion="0">
+  <models>
+    <modelRoot contentPath="${module}" type="default">
+      <sourceRoot location="models" />
+    </modelRoot>
+  </models>
+  <accessoryModels />
+  <generators>
+    <generator alias="main" namespace="jetbrains.mps.logic.propositional#5505606474790531941" uuid="53b8ab24-cc4a-4fe2-b461-11a91d798670" reflective-queries="true">
+      <models>
+        <modelRoot contentPath="${module}/generator/template" type="default">
+          <sourceRoot location="." />
+        </modelRoot>
+      </models>
+      <external-templates />
+      <languageVersions>
+        <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="5" />
+        <language slang="l:fd392034-7849-419d-9071-12563d152375:jetbrains.mps.baseLanguage.closures" version="0" />
+        <language slang="l:83888646-71ce-4f1c-9c53-c54016f6ad4f:jetbrains.mps.baseLanguage.collections" version="0" />
+        <language slang="l:f2801650-65d5-424e-bb1b-463a8781b786:jetbrains.mps.baseLanguage.javadoc" version="2" />
+        <language slang="l:760a0a8c-eabb-4521-8bfd-65db761a9ba3:jetbrains.mps.baseLanguage.logging" version="0" />
+        <language slang="l:a247e09e-2435-45ba-b8d2-07e93feba96a:jetbrains.mps.baseLanguage.tuples" version="0" />
+        <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="1" />
+        <language slang="l:b401a680-8325-4110-8fd3-84331ff25bef:jetbrains.mps.lang.generator" version="0" />
+        <language slang="l:d7706f63-9be2-479c-a3da-ae92af1e64d5:jetbrains.mps.lang.generator.generationContext" version="0" />
+        <language slang="l:289fcc83-6543-41e8-a5ca-768235715ce4:jetbrains.mps.lang.generator.generationParameters" version="0" />
+        <language slang="l:3a13115c-633c-4c5c-bbcc-75c4219e9555:jetbrains.mps.lang.quotation" version="0" />
+        <language slang="l:13744753-c81f-424a-9c1b-cf8943bf4e86:jetbrains.mps.lang.sharedConcepts" version="0" />
+        <language slang="l:7866978e-a0f0-4cc7-81bc-4d213d9375e1:jetbrains.mps.lang.smodel" version="8" />
+        <language slang="l:c7fb639f-be78-4307-89b0-b5959c3fa8c8:jetbrains.mps.lang.text" version="0" />
+        <language slang="l:9ded098b-ad6a-4657-bfd9-48636cfe8bc3: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="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
+        <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="1" />
+        <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
+        <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
+        <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
+        <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
+        <module reference="53b8ab24-cc4a-4fe2-b461-11a91d798670(jetbrains.mps.logic.propositional#5505606474790531941)" version="0" />
+      </dependencyVersions>
+      <mapping-priorities />
+    </generator>
+  </generators>
+  <sourcePath />
+  <dependencies>
+    <dependency reexport="false">daafa647-f1f7-4b0b-b096-69cd7c8408c0(jetbrains.mps.baseLanguage.regexp)</dependency>
+  </dependencies>
+  <languageVersions>
+    <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="5" />
+    <language slang="l:443f4c36-fcf5-4eb6-9500-8d06ed259e3e:jetbrains.mps.baseLanguage.classifiers" version="0" />
+    <language slang="l:fd392034-7849-419d-9071-12563d152375:jetbrains.mps.baseLanguage.closures" version="0" />
+    <language slang="l:83888646-71ce-4f1c-9c53-c54016f6ad4f:jetbrains.mps.baseLanguage.collections" version="0" />
+    <language slang="l:f2801650-65d5-424e-bb1b-463a8781b786:jetbrains.mps.baseLanguage.javadoc" version="2" />
+    <language slang="l:c7d5b9dd-a05f-4be2-bc73-f2e16994cc67:jetbrains.mps.baseLanguage.lightweightdsl" version="1" />
+    <language slang="l:760a0a8c-eabb-4521-8bfd-65db761a9ba3:jetbrains.mps.baseLanguage.logging" version="0" />
+    <language slang="l:daafa647-f1f7-4b0b-b096-69cd7c8408c0:jetbrains.mps.baseLanguage.regexp" version="0" />
+    <language slang="l:a247e09e-2435-45ba-b8d2-07e93feba96a:jetbrains.mps.baseLanguage.tuples" version="0" />
+    <language slang="l:df345b11-b8c7-4213-ac66-48d2a9b75d88:jetbrains.mps.baseLanguageInternal" version="0" />
+    <language slang="l:aee9cad2-acd4-4608-aef2-0004f6a1cdbd:jetbrains.mps.lang.actions" version="4" />
+    <language slang="l:af65afd8-f0dd-4942-87d9-63a55f2a9db1:jetbrains.mps.lang.behavior" version="1" />
+    <language slang="l:fe9d76d7-5809-45c9-ae28-a40915b4d6ff:jetbrains.mps.lang.checkedName" version="0" />
+    <language slang="l:3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1:jetbrains.mps.lang.constraints" version="4" />
+    <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="1" />
+    <language slang="l:7fa12e9c-b949-4976-b4fa-19accbc320b4:jetbrains.mps.lang.dataFlow" version="1" />
+    <language slang="l:f4ad079d-bc71-4ffb-9600-9328705cf998:jetbrains.mps.lang.descriptor" version="0" />
+    <language slang="l:18bc6592-03a6-4e29-a83a-7ff23bde13ba:jetbrains.mps.lang.editor" version="11" />
+    <language slang="l:64d34fcd-ad02-4e73-aff8-a581124c2e30:jetbrains.mps.lang.findUsages" version="0" />
+    <language slang="l:b401a680-8325-4110-8fd3-84331ff25bef:jetbrains.mps.lang.generator" version="0" />
+    <language slang="l:d7706f63-9be2-479c-a3da-ae92af1e64d5:jetbrains.mps.lang.generator.generationContext" version="0" />
+    <language slang="l:d7a92d38-f7db-40d0-8431-763b0c3c9f20:jetbrains.mps.lang.intentions" version="0" />
+    <language slang="l:d4615e3b-d671-4ba9-af01-2b78369b0ba7:jetbrains.mps.lang.pattern" version="1" />
+    <language slang="l:3a13115c-633c-4c5c-bbcc-75c4219e9555:jetbrains.mps.lang.quotation" version="0" />
+    <language slang="l:3ecd7c84-cde3-45de-886c-135ecc69b742:jetbrains.mps.lang.refactoring" version="0" />
+    <language slang="l:982eb8df-2c96-4bd7-9963-11712ea622e5:jetbrains.mps.lang.resources" version="2" />
+    <language slang="l:0eddeefa-c2d6-4437-bc2c-de50fd4ce470:jetbrains.mps.lang.script" version="0" />
+    <language slang="l:13744753-c81f-424a-9c1b-cf8943bf4e86:jetbrains.mps.lang.sharedConcepts" version="0" />
+    <language slang="l:7866978e-a0f0-4cc7-81bc-4d213d9375e1:jetbrains.mps.lang.smodel" version="8" />
+    <language slang="l:c72da2b9-7cce-4447-8389-f407dc1158b7:jetbrains.mps.lang.structure" version="6" />
+    <language slang="l:c7fb639f-be78-4307-89b0-b5959c3fa8c8:jetbrains.mps.lang.text" version="0" />
+    <language slang="l:b83431fe-5c8f-40bc-8a36-65e25f4dd253:jetbrains.mps.lang.textGen" version="1" />
+    <language slang="l:9ded098b-ad6a-4657-bfd9-48636cfe8bc3:jetbrains.mps.lang.traceable" version="0" />
+    <language slang="l:7a5dda62-9140-4668-ab76-d5ed1746f2b2:jetbrains.mps.lang.typesystem" version="1" />
+  </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="8865b7a8-5271-43d3-884c-6fd1d9cfdd34(MPS.OpenAPI)" version="0" />
+    <module reference="f3061a53-9226-4cc5-a443-f952ceaf5816(jetbrains.mps.baseLanguage)" version="0" />
+    <module reference="daafa647-f1f7-4b0b-b096-69cd7c8408c0(jetbrains.mps.baseLanguage.regexp)" version="0" />
+    <module reference="e39e4a59-8cb6-498e-860e-8fa8361c0d90(jetbrains.mps.baseLanguage.scopes)" version="0" />
+    <module reference="06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)" version="1" />
+    <module reference="2d3c70e9-aab2-4870-8d8d-6036800e4103(jetbrains.mps.kernel)" version="0" />
+    <module reference="ceab5195-25ea-4f22-9b92-103b95ca8c0c(jetbrains.mps.lang.core)" version="0" />
+    <module reference="a9e4c532-c5f5-4bb7-99ef-42abb73bbb70(jetbrains.mps.lang.descriptor.aspects)" version="0" />
+    <module reference="d7eb0a2a-bd50-4576-beae-e4a89db35f20(jetbrains.mps.lang.scopes.runtime)" version="0" />
+    <module reference="c72da2b9-7cce-4447-8389-f407dc1158b7(jetbrains.mps.lang.structure)" version="0" />
+    <module reference="9ded098b-ad6a-4657-bfd9-48636cfe8bc3(jetbrains.mps.lang.traceable)" version="0" />
+    <module reference="ec79e64d-4cbb-4f6c-b7b7-108dd125aba6(jetbrains.mps.logic.propositional)" version="0" />
+  </dependencyVersions>
+  <extendedLanguages>
+    <extendedLanguage>06b7c5c7-e359-4f4b-a581-5d0c9323af39(jetbrains.mps.fitch)</extendedLanguage>
+  </extendedLanguages>
+</language>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/behavior.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/behavior.mps
new file mode 100644
index 00000000..5c6b4467
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/behavior.mps
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:74226e2f-92d8-4334-831e-4e7b7fa70741(jetbrains.mps.logic.propositional.behavior)">
+  <persistence version="9" />
+  <languages>
+    <use id="af65afd8-f0dd-4942-87d9-63a55f2a9db1" name="jetbrains.mps.lang.behavior" version="1" />
+    <devkit ref="2677cb18-f558-4e33-bc38-a5139cee06dc(jetbrains.mps.devkit.language-design)" />
+  </languages>
+  <imports />
+  <registry />
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/constraints.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/constraints.mps
new file mode 100644
index 00000000..e7d42084
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/constraints.mps
@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:8ccc0587-6cb2-4342-adfa-b9156d0d1eeb(jetbrains.mps.logic.propositional.constraints)">
+  <persistence version="9" />
+  <languages>
+    <use id="3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1" name="jetbrains.mps.lang.constraints" version="4" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="5" />
+    <use id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp" version="0" />
+    <devkit ref="00000000-0000-4000-0000-5604ebd4f22c(jetbrains.mps.devkit.aspect.constraints)" />
+  </languages>
+  <imports>
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" />
+    <import index="tpfp" ref="r:00000000-0000-4000-0000-011c89590519(jetbrains.mps.baseLanguage.regexp.jetbrains.mps.regexp.accessory)" />
+  </imports>
+  <registry>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
+        <child id="1137022507850" name="body" index="2VODD2" />
+      </concept>
+      <concept id="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="1068581242878" name="jetbrains.mps.baseLanguage.structure.ReturnStatement" flags="nn" index="3cpWs6">
+        <child id="1068581517676" name="expression" index="3cqZAk" />
+      </concept>
+    </language>
+    <language id="3f4bc5f5-c6c1-4a28-8b10-c83066ffa4a1" name="jetbrains.mps.lang.constraints">
+      <concept id="1147467115080" name="jetbrains.mps.lang.constraints.structure.NodePropertyConstraint" flags="ng" index="EnEH3">
+        <reference id="1147467295099" name="applicableProperty" index="EomxK" />
+        <child id="1212097481299" name="propertyValidator" index="QCWH9" />
+      </concept>
+      <concept id="1212096972063" name="jetbrains.mps.lang.constraints.structure.ConstraintFunction_PropertyValidator" flags="in" index="QB0g5" />
+      <concept id="1213093968558" name="jetbrains.mps.lang.constraints.structure.ConceptConstraints" flags="ng" index="1M2fIO">
+        <reference id="1213093996982" name="concept" index="1M2myG" />
+        <child id="1213098023997" name="property" index="1MhHOB" />
+      </concept>
+      <concept id="1153138554286" name="jetbrains.mps.lang.constraints.structure.ConstraintsFunctionParameter_propertyValue" flags="nn" index="1Wqviy" />
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
+    </language>
+    <language id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp">
+      <concept id="1174482804200" name="jetbrains.mps.baseLanguage.regexp.structure.PlusRegexp" flags="ng" index="1OClNT" />
+      <concept id="1174485235885" name="jetbrains.mps.baseLanguage.regexp.structure.UnaryRegexp" flags="ng" index="1OLBAW">
+        <child id="1174485243418" name="regexp" index="1OLDsb" />
+      </concept>
+      <concept id="1174510540317" name="jetbrains.mps.baseLanguage.regexp.structure.InlineRegexpExpression" flags="nn" index="1Qi9sc">
+        <child id="1174510571016" name="regexp" index="1QigWp" />
+      </concept>
+      <concept id="1174512414484" name="jetbrains.mps.baseLanguage.regexp.structure.MatchRegexpStatement" flags="nn" index="1QpiS5">
+        <child id="1174512427594" name="body" index="1Qpmdr" />
+        <child id="1174512569438" name="expr" index="1QpSPf" />
+      </concept>
+      <concept id="1174555732504" name="jetbrains.mps.baseLanguage.regexp.structure.PredefinedSymbolClassRegexp" flags="ng" index="1SYyG9">
+        <reference id="1174555843709" name="symbolClass" index="1SYXPG" />
+      </concept>
+      <concept id="1174653354106" name="jetbrains.mps.baseLanguage.regexp.structure.RegexpUsingConstruction" flags="ng" index="1YMW5F">
+        <child id="1174653387388" name="regexp" index="1YN4dH" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="1M2fIO" id="3JXBM6C7aaV">
+    <property role="3GE5qa" value="sentence" />
+    <ref role="1M2myG" to="27wh:3JXBM6C3Cn8" resolve="Constant" />
+    <node concept="EnEH3" id="3JXBM6C7aaW" role="1MhHOB">
+      <ref role="EomxK" to="tpck:h0TrG11" resolve="name" />
+      <node concept="QB0g5" id="3JXBM6C7aaY" role="QCWH9">
+        <node concept="3clFbS" id="3JXBM6C7aaZ" role="2VODD2">
+          <node concept="1QpiS5" id="3JXBM6C7ai7" role="3cqZAp">
+            <node concept="1Qi9sc" id="3JXBM6C7ai8" role="1YN4dH">
+              <node concept="1OClNT" id="3JXBM6C7eeD" role="1QigWp">
+                <node concept="1SYyG9" id="3JXBM6C7emg" role="1OLDsb">
+                  <ref role="1SYXPG" to="tpfp:h5SUJUw" resolve="\w" />
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbS" id="3JXBM6C7aia" role="1Qpmdr">
+              <node concept="3cpWs6" id="3JXBM6C7aBY" role="3cqZAp">
+                <node concept="3clFbT" id="3JXBM6C7aJi" role="3cqZAk">
+                  <property role="3clFbU" value="true" />
+                </node>
+              </node>
+            </node>
+            <node concept="1Wqviy" id="3JXBM6C7apv" role="1QpSPf" />
+          </node>
+          <node concept="3cpWs6" id="3JXBM6C7aYb" role="3cqZAp">
+            <node concept="3clFbT" id="3JXBM6C7bdg" role="3cqZAk">
+              <property role="3clFbU" value="false" />
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/editor.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/editor.mps
new file mode 100644
index 00000000..91edd7b4
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/editor.mps
@@ -0,0 +1,1203 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:2ca623f4-8f74-473f-b3b6-e9b637018c0b(jetbrains.mps.logic.propositional.editor)">
+  <persistence version="9" />
+  <languages>
+    <use id="18bc6592-03a6-4e29-a83a-7ff23bde13ba" name="jetbrains.mps.lang.editor" version="11" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="5" />
+    <use id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel" version="8" />
+    <use id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections" version="0" />
+    <use id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp" version="0" />
+    <devkit ref="2677cb18-f558-4e33-bc38-a5139cee06dc(jetbrains.mps.devkit.language-design)" />
+  </languages>
+  <imports>
+    <import index="27wh" ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" />
+    <import index="tpfp" ref="r:00000000-0000-4000-0000-011c89590519(jetbrains.mps.baseLanguage.regexp.jetbrains.mps.regexp.accessory)" />
+  </imports>
+  <registry>
+    <language id="18bc6592-03a6-4e29-a83a-7ff23bde13ba" name="jetbrains.mps.lang.editor">
+      <concept id="1402906326895675325" name="jetbrains.mps.lang.editor.structure.CellActionMap_FunctionParm_selectedNode" flags="nn" index="0IXxy" />
+      <concept id="2000375450116454183" name="jetbrains.mps.lang.editor.structure.ISubstituteMenu" flags="ng" index="22mbnS">
+        <child id="414384289274416996" name="parts" index="3ft7WO" />
+      </concept>
+      <concept id="1071666914219" name="jetbrains.mps.lang.editor.structure.ConceptEditorDeclaration" flags="ig" index="24kQdi" />
+      <concept id="1597643335227097138" name="jetbrains.mps.lang.editor.structure.QueryFunctionParameter_TransformationMenu_node" flags="ng" index="7Obwk" />
+      <concept id="1140524381322" name="jetbrains.mps.lang.editor.structure.CellModel_ListWithRole" flags="ng" index="2czfm3">
+        <property id="1140524450557" name="separatorText" index="2czwfO" />
+        <child id="1140524464360" name="cellLayout" index="2czzBx" />
+        <child id="1140524464359" name="emptyCellModel" index="2czzBI" />
+        <child id="1233141163694" name="separatorStyle" index="sWeuL" />
+      </concept>
+      <concept id="1196434649611" name="jetbrains.mps.lang.editor.structure.SubstituteMenu_SimpleString" flags="ng" index="2h3Zct">
+        <property id="1196434851095" name="text" index="2h4Kg1" />
+      </concept>
+      <concept id="3459162043708467089" name="jetbrains.mps.lang.editor.structure.CellActionMap_CanExecuteFunction" flags="in" index="jK8Ss" />
+      <concept id="1237303669825" name="jetbrains.mps.lang.editor.structure.CellLayout_Indent" flags="nn" index="l2Vlx" />
+      <concept id="1233148810477" name="jetbrains.mps.lang.editor.structure.InlineStyleDeclaration" flags="ng" index="tppnM" />
+      <concept id="1177327274449" name="jetbrains.mps.lang.editor.structure.QueryFunctionParameter_pattern" flags="nn" index="ub8z3" />
+      <concept id="1177327570013" name="jetbrains.mps.lang.editor.structure.QueryFunction_SubstituteMenu_Substitute" flags="in" index="ucgPf" />
+      <concept id="8478191136883534237" name="jetbrains.mps.lang.editor.structure.IExtensibleSubstituteMenuPart" flags="ng" index="upBLQ">
+        <child id="8478191136883534238" name="features" index="upBLP" />
+      </concept>
+      <concept id="1177335944525" name="jetbrains.mps.lang.editor.structure.QueryFunction_SubstituteMenu_SubstituteString" flags="in" index="uGdhv" />
+      <concept id="1080736578640" name="jetbrains.mps.lang.editor.structure.BaseEditorComponent" flags="ig" index="2wURMF">
+        <child id="1080736633877" name="cellModel" index="2wV5jI" />
+      </concept>
+      <concept id="8329266386016608055" name="jetbrains.mps.lang.editor.structure.ApproveDelete_Operation" flags="ng" index="2xy62i">
+        <child id="8329266386016685951" name="editorContext" index="2xHN3q" />
+      </concept>
+      <concept id="3473224453637651916" name="jetbrains.mps.lang.editor.structure.TransformationLocation_SideTransform_PlaceInCellHolder" flags="ng" index="CtIbL">
+        <property id="3473224453637651917" name="placeInCell" index="CtIbK" />
+      </concept>
+      <concept id="1638911550608571617" name="jetbrains.mps.lang.editor.structure.TransformationMenu_Default" flags="ng" index="IW6AY" />
+      <concept id="1638911550608610798" name="jetbrains.mps.lang.editor.structure.QueryFunction_TransformationMenu_Execute" flags="ig" index="IWg2L" />
+      <concept id="1638911550608610278" name="jetbrains.mps.lang.editor.structure.TransformationMenuPart_Action" flags="ng" index="IWgqT">
+        <child id="1638911550608610281" name="executeFunction" index="IWgqQ" />
+        <child id="5692353713941573325" name="textFunction" index="1hCUd6" />
+      </concept>
+      <concept id="1186414536763" name="jetbrains.mps.lang.editor.structure.BooleanStyleSheetItem" flags="ln" index="VOi$J">
+        <property id="1186414551515" name="flag" index="VOm3f" />
+      </concept>
+      <concept id="1186414928363" name="jetbrains.mps.lang.editor.structure.SelectableStyleSheetItem" flags="ln" index="VPM3Z" />
+      <concept id="1630016958697344083" name="jetbrains.mps.lang.editor.structure.IMenu_Concept" flags="ng" index="2ZABuq">
+        <reference id="6591946374543067572" name="conceptDeclaration" index="aqKnT" />
+      </concept>
+      <concept id="1233758997495" name="jetbrains.mps.lang.editor.structure.PunctuationLeftStyleClassItem" flags="ln" index="11L4FC" />
+      <concept id="1233759184865" name="jetbrains.mps.lang.editor.structure.PunctuationRightStyleClassItem" flags="ln" index="11LMrY" />
+      <concept id="8998492695583125082" name="jetbrains.mps.lang.editor.structure.SubstituteFeature_MatchingText" flags="ng" index="16NfWO">
+        <child id="8998492695583129244" name="query" index="16NeZM" />
+      </concept>
+      <concept id="2896773699153795590" name="jetbrains.mps.lang.editor.structure.TransformationLocation_SideTransform" flags="ng" index="3cWJ9i">
+        <child id="3473224453637651919" name="placeInCell" index="CtIbM" />
+      </concept>
+      <concept id="7342352913006985483" name="jetbrains.mps.lang.editor.structure.SubstituteMenuPart_Action" flags="ng" index="3eGOop">
+        <child id="8612453216082699922" name="substituteHandler" index="3aKz83" />
+      </concept>
+      <concept id="1139535219966" name="jetbrains.mps.lang.editor.structure.CellActionMapDeclaration" flags="ig" index="1h_SRR">
+        <reference id="1139535219968" name="applicableConcept" index="1h_SK9" />
+        <child id="1139535219969" name="item" index="1h_SK8" />
+      </concept>
+      <concept id="1139535280617" name="jetbrains.mps.lang.editor.structure.CellActionMapItem" flags="lg" index="1hA7zw">
+        <property id="1139535298778" name="actionId" index="1hAc7j" />
+        <child id="3459162043708468028" name="canExecuteFunction" index="jK8aL" />
+        <child id="1139535280620" name="executeFunction" index="1hA7z_" />
+      </concept>
+      <concept id="1139535439104" name="jetbrains.mps.lang.editor.structure.CellActionMap_ExecuteFunction" flags="in" index="1hAIg9" />
+      <concept id="5692353713941573329" name="jetbrains.mps.lang.editor.structure.QueryFunction_TransformationMenu_ActionLabelText" flags="ig" index="1hCUdq" />
+      <concept id="3308396621974580100" name="jetbrains.mps.lang.editor.structure.SubstituteMenu_Default" flags="ng" index="3p36aQ" />
+      <concept id="1139848536355" name="jetbrains.mps.lang.editor.structure.CellModel_WithRole" flags="ng" index="1$h60E">
+        <reference id="1140103550593" name="relationDeclaration" index="1NtTu8" />
+      </concept>
+      <concept id="1073389214265" name="jetbrains.mps.lang.editor.structure.EditorCellModel" flags="ng" index="3EYTF0">
+        <reference id="1139959269582" name="actionMap" index="1ERwB7" />
+      </concept>
+      <concept id="1073389446423" name="jetbrains.mps.lang.editor.structure.CellModel_Collection" flags="sn" stub="3013115976261988961" index="3EZMnI">
+        <child id="1106270802874" name="cellLayout" index="2iSdaV" />
+        <child id="1073389446424" name="childCellModel" index="3EZMnx" />
+      </concept>
+      <concept id="1073389577006" name="jetbrains.mps.lang.editor.structure.CellModel_Constant" flags="sn" stub="3610246225209162225" index="3F0ifn">
+        <property id="1082639509531" name="nullText" index="ilYzB" />
+        <property id="1073389577007" name="text" index="3F0ifm" />
+      </concept>
+      <concept id="1073389658414" name="jetbrains.mps.lang.editor.structure.CellModel_Property" flags="sg" stub="730538219796134133" index="3F0A7n" />
+      <concept id="1219418625346" name="jetbrains.mps.lang.editor.structure.IStyleContainer" flags="ng" index="3F0Thp">
+        <child id="1219418656006" name="styleItem" index="3F10Kt" />
+      </concept>
+      <concept id="1073389882823" name="jetbrains.mps.lang.editor.structure.CellModel_RefNode" flags="sg" stub="730538219795960754" index="3F1sOY" />
+      <concept id="1073390211982" name="jetbrains.mps.lang.editor.structure.CellModel_RefNodeList" flags="sg" stub="2794558372793454595" index="3F2HdR" />
+      <concept id="5624877018228267058" name="jetbrains.mps.lang.editor.structure.ITransformationMenu" flags="ng" index="3INCJE">
+        <child id="1638911550608572412" name="sections" index="IW6Ez" />
+      </concept>
+      <concept id="1161622981231" name="jetbrains.mps.lang.editor.structure.ConceptFunctionParameter_editorContext" flags="nn" index="1Q80Hx" />
+      <concept id="7980428675268276156" name="jetbrains.mps.lang.editor.structure.TransformationMenuSection" flags="ng" index="1Qtc8_">
+        <child id="7980428675268276157" name="locations" index="1Qtc8$" />
+        <child id="7980428675268276159" name="parts" index="1Qtc8A" />
+      </concept>
+      <concept id="1166049232041" name="jetbrains.mps.lang.editor.structure.AbstractComponent" flags="ng" index="1XWOmA">
+        <reference id="1166049300910" name="conceptDeclaration" index="1XX52x" />
+      </concept>
+    </language>
+    <language id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage">
+      <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
+        <child id="1197027771414" name="operand" index="2Oq$k0" />
+        <child id="1197027833540" name="operation" index="2OqNvi" />
+      </concept>
+      <concept id="1145552977093" name="jetbrains.mps.baseLanguage.structure.GenericNewExpression" flags="nn" index="2ShNRf">
+        <child id="1145553007750" name="creator" index="2ShVmc" />
+      </concept>
+      <concept id="1137021947720" name="jetbrains.mps.baseLanguage.structure.ConceptFunction" flags="in" index="2VMwT0">
+        <child id="1137022507850" name="body" index="2VODD2" />
+      </concept>
+      <concept id="1070475926800" name="jetbrains.mps.baseLanguage.structure.StringLiteral" flags="nn" index="Xl_RD">
+        <property id="1070475926801" name="value" index="Xl_RC" />
+      </concept>
+      <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
+        <child id="1068431790190" name="initializer" index="33vP2m" />
+      </concept>
+      <concept id="1068498886296" name="jetbrains.mps.baseLanguage.structure.VariableReference" flags="nn" index="37vLTw">
+        <reference id="1068581517664" name="variableDeclaration" index="3cqZAo" />
+      </concept>
+      <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
+        <child id="5680397130376446158" name="type" index="1tU5fm" />
+      </concept>
+      <concept id="1068580123152" name="jetbrains.mps.baseLanguage.structure.EqualsExpression" flags="nn" index="3clFbC" />
+      <concept id="1068580123155" name="jetbrains.mps.baseLanguage.structure.ExpressionStatement" flags="nn" index="3clFbF">
+        <child id="1068580123156" name="expression" index="3clFbG" />
+      </concept>
+      <concept id="1068580123136" name="jetbrains.mps.baseLanguage.structure.StatementList" flags="sn" stub="5293379017992965193" index="3clFbS">
+        <child id="1068581517665" name="statement" index="3cqZAp" />
+      </concept>
+      <concept id="1068580320020" name="jetbrains.mps.baseLanguage.structure.IntegerConstant" flags="nn" index="3cmrfG">
+        <property id="1068580320021" name="value" index="3cmrfH" />
+      </concept>
+      <concept id="1068581242878" name="jetbrains.mps.baseLanguage.structure.ReturnStatement" flags="nn" index="3cpWs6">
+        <child id="1068581517676" name="expression" index="3cqZAk" />
+      </concept>
+      <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
+        <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
+      </concept>
+      <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
+      <concept id="1081773326031" name="jetbrains.mps.baseLanguage.structure.BinaryOperation" flags="nn" index="3uHJSO">
+        <child id="1081773367579" name="rightExpression" index="3uHU7w" />
+        <child id="1081773367580" name="leftExpression" index="3uHU7B" />
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+    </language>
+    <language id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel">
+      <concept id="1140725362528" name="jetbrains.mps.lang.smodel.structure.Link_SetTargetOperation" flags="nn" index="2oxUTD">
+        <child id="1140725362529" name="linkTarget" index="2oxUTC" />
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+      <concept id="1138661924179" name="jetbrains.mps.lang.smodel.structure.Property_SetOperation" flags="nn" index="tyxLq">
+        <child id="1138662048170" name="value" index="tz02z" />
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+      <concept id="1138757581985" name="jetbrains.mps.lang.smodel.structure.Link_SetNewChildOperation" flags="nn" index="zfrQC" />
+      <concept id="1139184414036" name="jetbrains.mps.lang.smodel.structure.LinkList_AddNewChildOperation" flags="nn" index="WFELt" />
+      <concept id="1180636770613" name="jetbrains.mps.lang.smodel.structure.SNodeCreator" flags="nn" index="3zrR0B">
+        <child id="1180636770616" name="createdType" index="3zrR0E" />
+      </concept>
+      <concept id="1139867745658" name="jetbrains.mps.lang.smodel.structure.Node_ReplaceWithNewOperation" flags="nn" index="1_qnLN">
+        <reference id="1139867957129" name="concept" index="1_rbq0" />
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+      <concept id="1140131837776" name="jetbrains.mps.lang.smodel.structure.Node_ReplaceWithAnotherOperation" flags="nn" index="1P9Npp">
+        <child id="1140131861877" name="replacementNode" index="1P9ThW" />
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+      <concept id="1138055754698" name="jetbrains.mps.lang.smodel.structure.SNodeType" flags="in" index="3Tqbb2">
+        <reference id="1138405853777" name="concept" index="ehGHo" />
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+      <concept id="1138056022639" name="jetbrains.mps.lang.smodel.structure.SPropertyAccess" flags="nn" index="3TrcHB">
+        <reference id="1138056395725" name="property" index="3TsBF5" />
+      </concept>
+      <concept id="1138056143562" name="jetbrains.mps.lang.smodel.structure.SLinkAccess" flags="nn" index="3TrEf2">
+        <reference id="1138056516764" name="link" index="3Tt5mk" />
+      </concept>
+      <concept id="1138056282393" name="jetbrains.mps.lang.smodel.structure.SLinkListAccess" flags="nn" index="3Tsc0h">
+        <reference id="1138056546658" name="link" index="3TtcxE" />
+      </concept>
+      <concept id="1228341669568" name="jetbrains.mps.lang.smodel.structure.Node_DetachOperation" flags="nn" index="3YRAZt" />
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+    <language id="daafa647-f1f7-4b0b-b096-69cd7c8408c0" name="jetbrains.mps.baseLanguage.regexp">
+      <concept id="1174482804200" name="jetbrains.mps.baseLanguage.regexp.structure.PlusRegexp" flags="ng" index="1OClNT" />
+      <concept id="1174485235885" name="jetbrains.mps.baseLanguage.regexp.structure.UnaryRegexp" flags="ng" index="1OLBAW">
+        <child id="1174485243418" name="regexp" index="1OLDsb" />
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+      <concept id="1174510540317" name="jetbrains.mps.baseLanguage.regexp.structure.InlineRegexpExpression" flags="nn" index="1Qi9sc">
+        <child id="1174510571016" name="regexp" index="1QigWp" />
+      </concept>
+      <concept id="1174512414484" name="jetbrains.mps.baseLanguage.regexp.structure.MatchRegexpStatement" flags="nn" index="1QpiS5">
+        <child id="1174512427594" name="body" index="1Qpmdr" />
+        <child id="1174512569438" name="expr" index="1QpSPf" />
+      </concept>
+      <concept id="1174555732504" name="jetbrains.mps.baseLanguage.regexp.structure.PredefinedSymbolClassRegexp" flags="ng" index="1SYyG9">
+        <reference id="1174555843709" name="symbolClass" index="1SYXPG" />
+      </concept>
+      <concept id="1174653354106" name="jetbrains.mps.baseLanguage.regexp.structure.RegexpUsingConstruction" flags="ng" index="1YMW5F">
+        <child id="1174653387388" name="regexp" index="1YN4dH" />
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+    <language id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections">
+      <concept id="540871147943773365" name="jetbrains.mps.baseLanguage.collections.structure.SingleArgumentSequenceOperation" flags="nn" index="25WWJ4">
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+                <node concept="3Tqbb2" id="3JXBM6C8jY6" role="1tU5fm">
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+                </node>
+                <node concept="zfrQC" id="3JXBM6C8jYm" role="2OqNvi" />
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+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3cWJ9i" id="3JXBM6C7kE2" role="1Qtc8$">
+        <node concept="CtIbL" id="3JXBM6C7kE4" role="CtIbM">
+          <property role="CtIbK" value="RIGHT" />
+        </node>
+      </node>
+    </node>
+    <node concept="1Qtc8_" id="3JXBM6C7GZo" role="IW6Ez">
+      <node concept="IWgqT" id="3JXBM6C7GZp" role="1Qtc8A">
+        <node concept="1hCUdq" id="3JXBM6C7GZq" role="1hCUd6">
+          <node concept="3clFbS" id="3JXBM6C7GZr" role="2VODD2">
+            <node concept="3clFbF" id="3JXBM6C7GZs" role="3cqZAp">
+              <node concept="Xl_RD" id="3JXBM6C7GZt" role="3clFbG">
+                <property role="Xl_RC" value="&amp;" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="IWg2L" id="3JXBM6C7GZu" role="IWgqQ">
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+              <node concept="3cpWsn" id="3JXBM6C7GZx" role="3cpWs9">
+                <property role="TrG5h" value="orig" />
+                <node concept="3Tqbb2" id="3JXBM6C7GZy" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+                </node>
+                <node concept="7Obwk" id="3JXBM6C7GZz" role="33vP2m" />
+              </node>
+            </node>
+            <node concept="3cpWs8" id="3JXBM6C7GZ$" role="3cqZAp">
+              <node concept="3cpWsn" id="3JXBM6C7GZ_" role="3cpWs9">
+                <property role="TrG5h" value="and" />
+                <node concept="3Tqbb2" id="3JXBM6C7GZA" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3FnV" resolve="And" />
+                </node>
+                <node concept="2OqwBi" id="3JXBM6C7GZB" role="33vP2m">
+                  <node concept="7Obwk" id="3JXBM6C7GZC" role="2Oq$k0" />
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+                    <ref role="1_rbq0" to="27wh:3JXBM6C3FnV" resolve="And" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbF" id="3JXBM6C7GZL" role="3cqZAp">
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+                </node>
+                <node concept="WFELt" id="3JXBM6C7GZQ" role="2OqNvi" />
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+            </node>
+            <node concept="3clFbF" id="3JXBM6C7GZE" role="3cqZAp">
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+                  <node concept="37vLTw" id="3JXBM6C7GZH" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3JXBM6C7GZ_" resolve="and" />
+                  </node>
+                  <node concept="3Tsc0h" id="3JXBM6C7GZI" role="2OqNvi">
+                    <ref role="3TtcxE" to="27wh:3JXBM6C3FnW" resolve="conjunct" />
+                  </node>
+                </node>
+                <node concept="TSZUe" id="3JXBM6C7GZJ" role="2OqNvi">
+                  <node concept="37vLTw" id="3JXBM6C7GZK" role="25WWJ7">
+                    <ref role="3cqZAo" node="3JXBM6C7GZx" resolve="orig" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="IWgqT" id="3JXBM6C7RN1" role="1Qtc8A">
+        <node concept="1hCUdq" id="3JXBM6C7RN2" role="1hCUd6">
+          <node concept="3clFbS" id="3JXBM6C7RN3" role="2VODD2">
+            <node concept="3clFbF" id="3JXBM6C7RN4" role="3cqZAp">
+              <node concept="Xl_RD" id="3JXBM6C7RN5" role="3clFbG">
+                <property role="Xl_RC" value="|" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="IWg2L" id="3JXBM6C7RN6" role="IWgqQ">
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+              <node concept="3cpWsn" id="3JXBM6C7RN9" role="3cpWs9">
+                <property role="TrG5h" value="orig" />
+                <node concept="3Tqbb2" id="3JXBM6C7RNa" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+                </node>
+                <node concept="7Obwk" id="3JXBM6C7RNb" role="33vP2m" />
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+            </node>
+            <node concept="3cpWs8" id="3JXBM6C7RNc" role="3cqZAp">
+              <node concept="3cpWsn" id="3JXBM6C7RNd" role="3cpWs9">
+                <property role="TrG5h" value="or" />
+                <node concept="3Tqbb2" id="3JXBM6C7RNe" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3FoA" resolve="Or" />
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+                    <ref role="1_rbq0" to="27wh:3JXBM6C3FoA" resolve="Or" />
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+            </node>
+            <node concept="3clFbF" id="3JXBM6C7RNp" role="3cqZAp">
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+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="IWgqT" id="3JXBM6C7ZTg" role="1Qtc8A">
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+              <node concept="Xl_RD" id="3JXBM6C80Nc" role="3clFbG">
+                <property role="Xl_RC" value="~" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="IWg2L" id="3JXBM6C7ZTm" role="IWgqQ">
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+              <node concept="3cpWsn" id="3JXBM6C814j" role="3cpWs9">
+                <property role="TrG5h" value="orig" />
+                <node concept="3Tqbb2" id="3JXBM6C814k" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3Cnq" resolve="Sentence" />
+                </node>
+                <node concept="7Obwk" id="3JXBM6C814l" role="33vP2m" />
+              </node>
+            </node>
+            <node concept="3cpWs8" id="3JXBM6C814m" role="3cqZAp">
+              <node concept="3cpWsn" id="3JXBM6C814n" role="3cpWs9">
+                <property role="TrG5h" value="not" />
+                <node concept="3Tqbb2" id="3JXBM6C814o" role="1tU5fm">
+                  <ref role="ehGHo" to="27wh:3JXBM6C3Cnn" resolve="Not" />
+                </node>
+                <node concept="2OqwBi" id="3JXBM6C814p" role="33vP2m">
+                  <node concept="7Obwk" id="3JXBM6C814q" role="2Oq$k0" />
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+                    <ref role="1_rbq0" to="27wh:3JXBM6C3Cnn" resolve="Not" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="3clFbF" id="3JXBM6C81aD" role="3cqZAp">
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+                  <node concept="37vLTw" id="3JXBM6C81aB" role="2Oq$k0">
+                    <ref role="3cqZAo" node="3JXBM6C814n" resolve="not" />
+                  </node>
+                  <node concept="3TrEf2" id="3JXBM6C81uc" role="2OqNvi">
+                    <ref role="3Tt5mk" to="27wh:3JXBM6C3Cno" resolve="target" />
+                  </node>
+                </node>
+                <node concept="2oxUTD" id="3JXBM6C829D" role="2OqNvi">
+                  <node concept="37vLTw" id="3JXBM6C82ah" role="2oxUTC">
+                    <ref role="3cqZAo" node="3JXBM6C814j" resolve="orig" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="3cWJ9i" id="3JXBM6C7GZR" role="1Qtc8$">
+        <node concept="CtIbL" id="3JXBM6C7GZS" role="CtIbM">
+          <property role="CtIbK" value="LEFT" />
+        </node>
+      </node>
+    </node>
+  </node>
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps
new file mode 100644
index 00000000..9f3090d0
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/structure.mps
@@ -0,0 +1,173 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:459ba7ac-2a61-40fc-bcc4-f13a7956cbeb(jetbrains.mps.logic.propositional.structure)">
+  <persistence version="9" />
+  <languages>
+    <use id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure" version="6" />
+    <devkit ref="78434eb8-b0e5-444b-850d-e7c4ad2da9ab(jetbrains.mps.devkit.aspect.structure)" />
+  </languages>
+  <imports>
+    <import index="jfgh" ref="r:2003997c-f9a6-418f-99d4-03e1285a3e13(jetbrains.mps.fitch.structure)" />
+    <import index="tpck" ref="r:00000000-0000-4000-0000-011c89590288(jetbrains.mps.lang.core.structure)" />
+  </imports>
+  <registry>
+    <language id="c72da2b9-7cce-4447-8389-f407dc1158b7" name="jetbrains.mps.lang.structure">
+      <concept id="1169125787135" name="jetbrains.mps.lang.structure.structure.AbstractConceptDeclaration" flags="ig" index="PkWjJ">
+        <property id="6714410169261853888" name="conceptId" index="EcuMT" />
+        <property id="4628067390765907488" name="conceptShortDescription" index="R4oN_" />
+        <property id="5092175715804935370" name="conceptAlias" index="34LRSv" />
+        <child id="1071489727083" name="linkDeclaration" index="1TKVEi" />
+      </concept>
+      <concept id="1169125989551" name="jetbrains.mps.lang.structure.structure.InterfaceConceptDeclaration" flags="ig" index="PlHQZ">
+        <child id="1169127546356" name="extends" index="PrDN$" />
+      </concept>
+      <concept id="1169127622168" name="jetbrains.mps.lang.structure.structure.InterfaceConceptReference" flags="ig" index="PrWs8">
+        <reference id="1169127628841" name="intfc" index="PrY4T" />
+      </concept>
+      <concept id="1071489090640" name="jetbrains.mps.lang.structure.structure.ConceptDeclaration" flags="ig" index="1TIwiD">
+        <reference id="1071489389519" name="extends" index="1TJDcQ" />
+        <child id="1169129564478" name="implements" index="PzmwI" />
+      </concept>
+      <concept id="1071489288298" name="jetbrains.mps.lang.structure.structure.LinkDeclaration" flags="ig" index="1TJgyj">
+        <property id="1071599776563" name="role" index="20kJfa" />
+        <property id="1071599893252" name="sourceCardinality" index="20lbJX" />
+        <property id="1071599937831" name="metaClass" index="20lmBu" />
+        <property id="241647608299431140" name="linkId" index="IQ2ns" />
+        <reference id="1071599976176" name="target" index="20lvS9" />
+      </concept>
+    </language>
+    <language id="ceab5195-25ea-4f22-9b92-103b95ca8c0c" name="jetbrains.mps.lang.core">
+      <concept id="1133920641626" name="jetbrains.mps.lang.core.structure.BaseConcept" flags="ng" index="2VYdi">
+        <property id="1193676396447" name="virtualPackage" index="3GE5qa" />
+      </concept>
+      <concept id="1169194658468" name="jetbrains.mps.lang.core.structure.INamedConcept" flags="ng" index="TrEIO">
+        <property id="1169194664001" name="name" index="TrG5h" />
+      </concept>
+    </language>
+  </registry>
+  <node concept="1TIwiD" id="3JXBM6C3FnV">
+    <property role="EcuMT" value="4322786184247817723" />
+    <property role="TrG5h" value="And" />
+    <property role="34LRSv" value="and" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Conjunction" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3FnV" resolve="And_old" />
+    <node concept="1TJgyj" id="3JXBM6C3FnW" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817724" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="conjunct" />
+      <property role="20lbJX" value="1..n" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Fsj" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="3JXBM6C3Cn8">
+    <property role="EcuMT" value="4322786184247805384" />
+    <property role="TrG5h" value="Constant" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Constant" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3Cn8" resolve="Constant_old" />
+    <node concept="PrWs8" id="3JXBM6C3Fso" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Cn9" role="PzmwI">
+      <ref role="PrY4T" to="tpck:h0TrEE$" resolve="INamedConcept" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="3JXBM6C3Fph">
+    <property role="EcuMT" value="4322786184247817809" />
+    <property role="TrG5h" value="If" />
+    <property role="34LRSv" value="if" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Implication" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3Fph" resolve="If_old" />
+    <node concept="1TJgyj" id="3JXBM6C3Fpi" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817810" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="antecedent" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="1TJgyj" id="3JXBM6C3Fpk" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817812" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="consequent" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Fss" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="3JXBM6C3Frx">
+    <property role="EcuMT" value="4322786184247817953" />
+    <property role="TrG5h" value="Iff" />
+    <property role="34LRSv" value="iff" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Biconditional" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3Frx" resolve="Iff_old" />
+    <node concept="1TJgyj" id="3JXBM6C3FrF" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817963" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="antecedent" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="1TJgyj" id="3JXBM6C3FrG" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817964" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="consequent" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Fsu" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="3JXBM6C3Cnn">
+    <property role="EcuMT" value="4322786184247805399" />
+    <property role="TrG5h" value="Not" />
+    <property role="34LRSv" value="not" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Negation" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3Cnn" resolve="Not_old" />
+    <node concept="1TJgyj" id="3JXBM6C3Cno" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247805400" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="target" />
+      <property role="20lbJX" value="1" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Fsw" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+  </node>
+  <node concept="1TIwiD" id="3JXBM6C3FoA">
+    <property role="EcuMT" value="4322786184247817766" />
+    <property role="TrG5h" value="Or" />
+    <property role="34LRSv" value="or" />
+    <property role="3GE5qa" value="sentence" />
+    <property role="R4oN_" value="Disjunction" />
+    <ref role="1TJDcQ" to="jfgh:3JXBM6C3FoA" resolve="Or_old" />
+    <node concept="1TJgyj" id="3JXBM6C3Fp4" role="1TKVEi">
+      <property role="IQ2ns" value="4322786184247817796" />
+      <property role="20lmBu" value="aggregation" />
+      <property role="20kJfa" value="disjunct" />
+      <property role="20lbJX" value="1..n" />
+      <ref role="20lvS9" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+    <node concept="PrWs8" id="3JXBM6C3Fsy" role="PzmwI">
+      <ref role="PrY4T" node="3JXBM6C3Cnq" resolve="Sentence" />
+    </node>
+  </node>
+  <node concept="PlHQZ" id="3JXBM6C3Cnq">
+    <property role="EcuMT" value="4322786184247805402" />
+    <property role="TrG5h" value="Sentence" />
+    <property role="3GE5qa" value="sentence" />
+    <node concept="PrWs8" id="4LBPYGUYJPe" role="PrDN$">
+      <ref role="PrY4T" to="jfgh:3JXBM6C3Cnq" resolve="Sentence_old" />
+    </node>
+  </node>
+</model>
+
diff --git a/samples/fitch/languages/jetbrains.mps.logic.propositional/models/typesystem.mps b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/typesystem.mps
new file mode 100644
index 00000000..d0e74840
--- /dev/null
+++ b/samples/fitch/languages/jetbrains.mps.logic.propositional/models/typesystem.mps
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<model ref="r:66ac687e-b631-4ad4-84c8-55502c32e02c(jetbrains.mps.logic.propositional.typesystem)">
+  <persistence version="9" />
+  <languages>
+    <use id="7a5dda62-9140-4668-ab76-d5ed1746f2b2" name="jetbrains.mps.lang.typesystem" version="1" />
+    <devkit ref="00000000-0000-4000-0000-1de82b3a4936(jetbrains.mps.devkit.aspect.typesystem)" />
+  </languages>
+  <imports />
+  <registry />
+</model>
+