diff --git a/coderules/languages/jetbrains.mps.logic/runtime/jetbrains.mps.logic.runtime.msd b/coderules/languages/jetbrains.mps.logic/runtime/jetbrains.mps.logic.runtime.msd
index 43f9481d..1363ac34 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/jetbrains.mps.logic.runtime.msd
+++ b/coderules/languages/jetbrains.mps.logic/runtime/jetbrains.mps.logic.runtime.msd
@@ -14,6 +14,7 @@
   </dependencies>
   <languageVersions>
     <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="8" />
+    <language slang="l:774bf8a0-62e5-41e1-af63-f4812e60e48b:jetbrains.mps.baseLanguage.checkedDots" 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="1" />
     <language slang="l:f2801650-65d5-424e-bb1b-463a8781b786:jetbrains.mps.baseLanguage.javadoc" version="2" />
diff --git a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
index f7cda2aa..c2d1e455 100644
--- a/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
+++ b/coderules/languages/jetbrains.mps.logic/runtime/models/jetbrains.mps.logic.predicate.mps
@@ -6,6 +6,7 @@
     <use id="760a0a8c-eabb-4521-8bfd-65db761a9ba3" name="jetbrains.mps.baseLanguage.logging" version="0" />
     <use id="f2801650-65d5-424e-bb1b-463a8781b786" name="jetbrains.mps.baseLanguage.javadoc" version="2" />
     <use id="fd392034-7849-419d-9071-12563d152375" name="jetbrains.mps.baseLanguage.closures" version="0" />
+    <use id="774bf8a0-62e5-41e1-af63-f4812e60e48b" name="jetbrains.mps.baseLanguage.checkedDots" version="0" />
   </languages>
   <imports>
     <import index="av0y" ref="bbf5c548-7111-4a53-a117-cdefc664cf34/java:jetbrains.mps.logic.reactor.program(jetbrains.mps.logic.reactor/)" />
@@ -122,6 +123,7 @@
       <concept id="1068498886294" name="jetbrains.mps.baseLanguage.structure.AssignmentExpression" flags="nn" index="37vLTI" />
       <concept id="1225271177708" name="jetbrains.mps.baseLanguage.structure.StringType" flags="in" index="17QB3L" />
       <concept id="1225271221393" name="jetbrains.mps.baseLanguage.structure.NPENotEqualsExpression" flags="nn" index="17QLQc" />
+      <concept id="1225271283259" name="jetbrains.mps.baseLanguage.structure.NPEEqualsExpression" flags="nn" index="17R0WA" />
       <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
         <child id="5680397130376446158" name="type" index="1tU5fm" />
       </concept>
@@ -186,9 +188,6 @@
         <child id="5375687026011219971" name="member" index="jymVt" unordered="true" />
       </concept>
       <concept id="1171903607971" name="jetbrains.mps.baseLanguage.structure.WildCardType" flags="in" index="3qTvmN" />
-      <concept id="1171903916106" name="jetbrains.mps.baseLanguage.structure.UpperBoundType" flags="in" index="3qUE_q">
-        <child id="1171903916107" name="bound" index="3qUE_r" />
-      </concept>
       <concept id="7812454656619025416" name="jetbrains.mps.baseLanguage.structure.MethodDeclaration" flags="ng" index="1rXfSm">
         <property id="8355037393041754995" name="isNative" index="2aFKle" />
       </concept>
@@ -234,6 +233,9 @@
         <reference id="1170346070688" name="classifier" index="1Y3XeK" />
       </concept>
     </language>
+    <language id="774bf8a0-62e5-41e1-af63-f4812e60e48b" name="jetbrains.mps.baseLanguage.checkedDots">
+      <concept id="4079382982702596667" name="jetbrains.mps.baseLanguage.checkedDots.structure.CheckedDotExpression" flags="nn" index="2EnYce" />
+    </language>
     <language id="fd392034-7849-419d-9071-12563d152375" name="jetbrains.mps.baseLanguage.closures">
       <concept id="1199569711397" name="jetbrains.mps.baseLanguage.closures.structure.ClosureLiteral" flags="nn" index="1bVj0M">
         <child id="1199569906740" name="parameter" index="1bW2Oz" />
@@ -842,7 +844,7 @@
             <node concept="3clFbS" id="2UGjFq4lTBV" role="3clFbx">
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-                  <ref role="37wK5l" node="6GYQG_SpvAS" resolve="ask_term_term" />
+                  <ref role="37wK5l" node="6GYQG_SpvAS" resolve="askUni_val_val" />
                   <node concept="10QFUN" id="2UGjFq4lTBY" role="37wK5m">
                     <node concept="37vLTw" id="2UGjFq4lTDj" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -885,7 +887,7 @@
               <node concept="3clFbS" id="2UGjFq4lTCd" role="3eOfB_">
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                   <node concept="1rXfSq" id="2UGjFq4lTCf" role="3cqZAk">
-                    <ref role="37wK5l" node="4U_yxogC1eF" resolve="ask_term_logical" />
+                    <ref role="37wK5l" node="4U_yxogC1eF" resolve="askUni_val_logical" />
                     <node concept="10QFUN" id="2UGjFq4lTCg" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lTDm" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -932,7 +934,7 @@
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-                    <ref role="37wK5l" node="4U_yxogC1Eh" resolve="ask_logical_term" />
+                    <ref role="37wK5l" node="4U_yxogC1Eh" resolve="askUni_logical_val" />
                     <node concept="10QFUN" id="2UGjFq4lTCz" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lTDu" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lTDc" resolve="left" />
@@ -1061,11 +1063,6 @@
           </node>
         </node>
         <node concept="3clFbS" id="2UGjFq4mhEU" role="3clF47">
-          <node concept="3SKdUt" id="2rIdnPtNuQp" role="3cqZAp">
-            <node concept="3SKdUq" id="2rIdnPtNuQr" role="3SKWNk">
-              <property role="3SKdUp" value="FIXME: logicalContext not used?" />
-            </node>
-          </node>
           <node concept="3clFbF" id="2UGjFq4mjW$" role="3cqZAp">
             <node concept="1rXfSq" id="2UGjFq4mjW_" role="3clFbG">
               <ref role="37wK5l" node="2UGjFq4mbmq" resolve="doTell" />
@@ -1155,201 +1152,176 @@
           </node>
         </node>
         <node concept="3clFbS" id="2UGjFq4mbkL" role="3clF47">
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-                  <node concept="10QFUN" id="2UGjFq4mbkQ" role="37wK5m">
-                    <node concept="37vLTw" id="2UGjFq4mbmm" role="10QFUP">
+          <node concept="3clFbJ" id="5TfjU0x$Mm1" role="3cqZAp">
+            <node concept="3clFbS" id="5TfjU0x$Mm2" role="3clFbx">
+              <node concept="3clFbF" id="5TfjU0x$Mm3" role="3cqZAp">
+                <node concept="1rXfSq" id="5TfjU0x$Mm4" role="3clFbG">
+                  <ref role="37wK5l" node="4U_yxogC05I" resolve="tellUni_logical_logical" />
+                  <node concept="10QFUN" id="5TfjU0x$Mm5" role="37wK5m">
+                    <node concept="37vLTw" id="5TfjU0x$Mm6" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
                     </node>
-                    <node concept="16syzq" id="2UGjFq4mbkS" role="10QFUM">
-                      <ref role="16sUi3" node="2UGjFq4mdQc" resolve="TERM" />
+                    <node concept="3uibUv" id="5TfjU0x$Mm7" role="10QFUM">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="16syzq" id="5TfjU0x_9T$" role="11_B2D">
+                        <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
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+                    <node concept="3uibUv" id="5TfjU0x$Mma" role="10QFUM">
+                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      <node concept="16syzq" id="5TfjU0x_abK" role="11_B2D">
+                        <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
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-                    <node concept="37vLTw" id="2UGjFq4mbmc" role="10QFUP">
+                    <node concept="37vLTw" id="5TfjU0x$Mmc" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4mbm6" resolve="right" />
                     </node>
                   </node>
                 </node>
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-              <node concept="3clFbH" id="2UGjFq4mbkW" role="3cqZAp" />
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+              <node concept="2ZW3vV" id="5TfjU0x$Mmf" role="3uHU7w">
+                <node concept="3uibUv" id="5TfjU0x$Mmg" role="2ZW6by">
+                  <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
                 </node>
-                <node concept="37vLTw" id="2UGjFq4mbmn" role="2ZW6bz">
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+                <node concept="3uibUv" id="5TfjU0x$Mmj" role="2ZW6by">
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                 </node>
-                <node concept="37vLTw" id="2UGjFq4mbm9" role="2ZW6bz">
+                <node concept="37vLTw" id="5TfjU0x$Mmk" role="2ZW6bz">
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                 </node>
               </node>
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-                      <node concept="37vLTw" id="2UGjFq4mbmk" role="10QFUP">
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+                    <ref role="37wK5l" node="4U_yxogBZLB" resolve="tellUni_logical_val" />
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                         <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
                       </node>
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-                      <node concept="3uibUv" id="2UGjFq4mblc" role="10QFUM">
+                      <node concept="3uibUv" id="5TfjU0x$Mmr" role="10QFUM">
                         <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                        <node concept="16syzq" id="2UGjFq4mbld" role="11_B2D">
-                          <ref role="16sUi3" node="2UGjFq4mdQc" resolve="TERM" />
+                        <node concept="16syzq" id="5TfjU0x_aKF" role="11_B2D">
+                          <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
                         </node>
                       </node>
-                      <node concept="37vLTw" id="2UGjFq4mbmh" role="10QFUP">
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+                    <node concept="10QFUN" id="5TfjU0x$Mmt" role="37wK5m">
+                      <node concept="16syzq" id="5TfjU0x_aMf" role="10QFUM">
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                         <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
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                   </node>
-                  <node concept="37vLTw" id="2UGjFq4mbmb" role="2ZW6bz">
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-                    <node concept="10QFUN" id="2UGjFq4mblI" role="37wK5m">
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+                    <ref role="37wK5l" node="4U_yxogBZsK" resolve="tellUni_val_logical" />
+                    <node concept="10QFUN" id="5TfjU0x$MmI" role="37wK5m">
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+                        <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
+                      </node>
+                      <node concept="37vLTw" id="5TfjU0x$MmK" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
                       </node>
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-                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                        <node concept="16syzq" id="2UGjFq4mblL" role="11_B2D">
-                          <ref role="16sUi3" node="2UGjFq4mdQc" resolve="TERM" />
-                        </node>
-                      </node>
                     </node>
-                    <node concept="10QFUN" id="2UGjFq4mblM" role="37wK5m">
-                      <node concept="3uibUv" id="2UGjFq4mblN" role="10QFUM">
+                    <node concept="10QFUN" id="5TfjU0x$MmL" role="37wK5m">
+                      <node concept="3uibUv" id="5TfjU0x$MmM" role="10QFUM">
                         <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                        <node concept="16syzq" id="2UGjFq4mblO" role="11_B2D">
-                          <ref role="16sUi3" node="2UGjFq4mdQc" resolve="TERM" />
+                        <node concept="16syzq" id="5TfjU0x_jF0" role="11_B2D">
+                          <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
                         </node>
                       </node>
-                      <node concept="37vLTw" id="2UGjFq4mbmi" role="10QFUP">
+                      <node concept="37vLTw" id="5TfjU0x$MmO" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4mbm6" resolve="right" />
                       </node>
                     </node>
                   </node>
                 </node>
-                <node concept="3clFbH" id="2UGjFq4mblQ" role="3cqZAp" />
+                <node concept="3clFbH" id="5TfjU0x$MmP" role="3cqZAp" />
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-                <node concept="2ZW3vV" id="2UGjFq4mblS" role="3uHU7w">
-                  <node concept="3uibUv" id="5cDlfXt7hiv" role="2ZW6by">
+              <node concept="1Wc70l" id="5TfjU0x$MmQ" role="3eO9$A">
+                <node concept="2ZW3vV" id="5TfjU0x$MmR" role="3uHU7w">
+                  <node concept="3uibUv" id="5TfjU0x$MmS" role="2ZW6by">
                     <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
                   </node>
-                  <node concept="37vLTw" id="2UGjFq4mbmj" role="2ZW6bz">
+                  <node concept="37vLTw" id="5TfjU0x$MmT" role="2ZW6bz">
                     <ref role="3cqZAo" node="2UGjFq4mbm6" resolve="right" />
                   </node>
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-                  <node concept="37vLTw" id="2UGjFq4mbmd" role="2ZW6bz">
-                    <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
+                <node concept="3fqX7Q" id="5TfjU0x$MmU" role="3uHU7B">
+                  <node concept="1eOMI4" id="5TfjU0x$MmV" role="3fr31v">
+                    <node concept="2ZW3vV" id="5TfjU0x$MmW" role="1eOMHV">
+                      <node concept="3uibUv" id="5TfjU0x$MmX" role="2ZW6by">
+                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                      </node>
+                      <node concept="37vLTw" id="5TfjU0x$MmY" role="2ZW6bz">
+                        <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
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                 </node>
               </node>
             </node>
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-                <node concept="YS8fn" id="2UGjFq4mbm0" role="3cqZAp">
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-                    <node concept="1pGfFk" id="2UGjFq4mbm2" role="2ShVmc">
-                      <ref role="37wK5l" to="wyt6:~IllegalArgumentException.&lt;init&gt;(java.lang.String)" resolve="IllegalArgumentException" />
-                      <node concept="Xl_RD" id="2UGjFq4mbm3" role="37wK5m">
-                        <property role="Xl_RC" value="invalid arguments" />
+            <node concept="9aQIb" id="5TfjU0x$Mnm" role="9aQIa">
+              <node concept="3clFbS" id="5TfjU0x$Mnn" role="9aQI4">
+                <node concept="3clFbF" id="5TfjU0x$Mn3" role="3cqZAp">
+                  <node concept="1rXfSq" id="5TfjU0x$Mn4" role="3clFbG">
+                    <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tellUni_val_val" />
+                    <node concept="10QFUN" id="5TfjU0x$Mn5" role="37wK5m">
+                      <node concept="16syzq" id="5TfjU0x_l26" role="10QFUM">
+                        <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
+                      </node>
+                      <node concept="37vLTw" id="5TfjU0x$Mn7" role="10QFUP">
+                        <ref role="3cqZAo" node="2UGjFq4mbm4" resolve="left" />
+                      </node>
+                    </node>
+                    <node concept="10QFUN" id="5TfjU0x$Mn8" role="37wK5m">
+                      <node concept="16syzq" id="5TfjU0x_l4S" role="10QFUM">
+                        <ref role="16sUi3" node="5TfjU0x_7hm" resolve="T" />
+                      </node>
+                      <node concept="37vLTw" id="5TfjU0x$Mna" role="10QFUP">
+                        <ref role="3cqZAo" node="2UGjFq4mbm6" resolve="right" />
                       </node>
                     </node>
                   </node>
@@ -1358,364 +1330,418 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="2UGjFq4mdQc" role="16eVyc">
-          <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="2UGjFq4mdQd" role="3ztrMU">
-            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-          </node>
+        <node concept="16euLQ" id="5TfjU0x_7hm" role="16eVyc">
+          <property role="TrG5h" value="T" />
         </node>
       </node>
       <node concept="2tJIrI" id="4xBopTzmvIq" role="jymVt" />
       <node concept="3clFb_" id="6GYQG_SpvAG" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="tell_term_term" />
+        <property role="TrG5h" value="tellUni_val_val" />
         <node concept="37vLTG" id="6GYQG_SpvAH" role="3clF46">
           <property role="TrG5h" value="leftVal" />
-          <node concept="16syzq" id="6MYr6JwAqQZ" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6JwAoT2" resolve="TERM" />
+          <node concept="16syzq" id="5TfjU0xzQSB" role="1tU5fm">
+            <ref role="16sUi3" node="5TfjU0xzNnP" resolve="T" />
           </node>
         </node>
         <node concept="37vLTG" id="6GYQG_SpvAJ" role="3clF46">
           <property role="TrG5h" value="rightVal" />
-          <node concept="16syzq" id="6MYr6JwAs2I" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6JwAoT2" resolve="TERM" />
+          <node concept="16syzq" id="5TfjU0xzSA0" role="1tU5fm">
+            <ref role="16sUi3" node="5TfjU0xzNnP" resolve="T" />
           </node>
         </node>
         <node concept="3cqZAl" id="6GYQG_SpvAL" role="3clF45" />
         <node concept="3Tm6S6" id="3gNap3fZftQ" role="1B3o_S" />
         <node concept="3clFbS" id="6GYQG_SpvAR" role="3clF47">
-          <node concept="3cpWs8" id="7K4Mb_J$cIA" role="3cqZAp">
-            <node concept="3cpWsn" id="7K4Mb_J$cIB" role="3cpWs9">
-              <property role="TrG5h" value="subs" />
-              <node concept="3uibUv" id="7K4Mb_J$cIC" role="1tU5fm">
-                <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
-              </node>
-              <node concept="2OqwBi" id="6OkhGGhHPa$" role="33vP2m">
-                <node concept="10M0yZ" id="6OkhGGhHOO5" role="2Oq$k0">
-                  <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
-                  <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
-                </node>
-                <node concept="liA8E" id="6OkhGGhHPxp" role="2OqNvi">
-                  <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
-                  <node concept="37vLTw" id="7K4Mb_J$cIE" role="37wK5m">
-                    <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
+          <node concept="3clFbJ" id="5TfjU0x$3Wv" role="3cqZAp">
+            <node concept="3clFbS" id="5TfjU0x$3Wx" role="3clFbx">
+              <node concept="3cpWs8" id="7K4Mb_J$cIA" role="3cqZAp">
+                <node concept="3cpWsn" id="7K4Mb_J$cIB" role="3cpWs9">
+                  <property role="TrG5h" value="subs" />
+                  <node concept="3uibUv" id="7K4Mb_J$cIC" role="1tU5fm">
+                    <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
                   </node>
-                  <node concept="37vLTw" id="7K4Mb_J$cIF" role="37wK5m">
-                    <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
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-              <node concept="YS8fn" id="5jCHAT1IF0X" role="3cqZAp">
-                <node concept="2ShNRf" id="5jCHAT1IF0Y" role="YScLw">
-                  <node concept="1pGfFk" id="5jCHAT1IF0Z" role="2ShVmc">
-                    <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
-                    <node concept="3cpWs3" id="5jCHAT1IFhN" role="37wK5m">
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-                        <node concept="3cpWs3" id="5jCHAT1IFhP" role="3uHU7B">
-                          <node concept="3cpWs3" id="5jCHAT1IFhQ" role="3uHU7B">
-                            <node concept="3cpWs3" id="5jCHAT1IFhR" role="3uHU7B">
-                              <node concept="Xl_RD" id="5jCHAT1IFhS" role="3uHU7B">
-                                <property role="Xl_RC" value="Cannot unify " />
-                              </node>
-                              <node concept="37vLTw" id="5jCHAT1IFhT" role="3uHU7w">
-                                <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
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-                            </node>
-                            <node concept="Xl_RD" id="5jCHAT1IFhU" role="3uHU7w">
-                              <property role="Xl_RC" value=" and " />
-                            </node>
+                  <node concept="2OqwBi" id="6OkhGGhHPa$" role="33vP2m">
+                    <node concept="10M0yZ" id="6OkhGGhHOO5" role="2Oq$k0">
+                      <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
+                      <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
+                    </node>
+                    <node concept="liA8E" id="6OkhGGhHPxp" role="2OqNvi">
+                      <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
+                      <node concept="1eOMI4" id="5TfjU0x$pu8" role="37wK5m">
+                        <node concept="10QFUN" id="5TfjU0x$pu5" role="1eOMHV">
+                          <node concept="3uibUv" id="5TfjU0x$pua" role="10QFUM">
+                            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
                           </node>
-                          <node concept="37vLTw" id="5jCHAT1IFhV" role="3uHU7w">
+                          <node concept="37vLTw" id="5TfjU0x$puh" role="10QFUP">
+                            <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="1eOMI4" id="5TfjU0x$rdb" role="37wK5m">
+                        <node concept="10QFUN" id="5TfjU0x$rd8" role="1eOMHV">
+                          <node concept="3uibUv" id="5TfjU0x$rdd" role="10QFUM">
+                            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+                          </node>
+                          <node concept="37vLTw" id="5TfjU0x$rdk" role="10QFUP">
                             <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
                           </node>
                         </node>
-                        <node concept="Xl_RD" id="5jCHAT1IFhW" role="3uHU7w">
-                          <property role="Xl_RC" value=": " />
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-                        <ref role="37wK5l" node="1MWQR5SpMLA" resolve="formatMessage" />
-                        <node concept="37vLTw" id="5jCHAT1IFhY" role="37wK5m">
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                   </node>
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-                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
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-                          <node concept="37vLTw" id="46l0wJhwl3q" role="37wK5m">
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-                                  <ref role="3cqZAo" node="6SkxsMzDp28" resolve="bnd" />
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+                          <node concept="3cpWs3" id="5jCHAT1IFhO" role="3uHU7B">
+                            <node concept="3cpWs3" id="5jCHAT1IFhP" role="3uHU7B">
+                              <node concept="3cpWs3" id="5jCHAT1IFhQ" role="3uHU7B">
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+                                  <node concept="Xl_RD" id="5jCHAT1IFhS" role="3uHU7B">
+                                    <property role="Xl_RC" value="Cannot unify " />
+                                  </node>
+                                  <node concept="37vLTw" id="5jCHAT1IFhT" role="3uHU7w">
+                                    <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
+                                  </node>
                                 </node>
-                                <node concept="liA8E" id="6MYr6JwS1$p" role="2OqNvi">
-                                  <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                <node concept="Xl_RD" id="5jCHAT1IFhU" role="3uHU7w">
+                                  <property role="Xl_RC" value=" and " />
                                 </node>
                               </node>
+                              <node concept="37vLTw" id="5jCHAT1IFhV" role="3uHU7w">
+                                <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
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@@ -1723,279 +1749,290 @@
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+                                      <ref role="37wK5l" node="3gNap3fZimy" resolve="asLogicalValue" />
+                                      <node concept="2OqwBi" id="3gNap3fZkRU" role="37wK5m">
+                                        <node concept="37vLTw" id="3gNap3fZkM8" role="2Oq$k0">
+                                          <ref role="3cqZAo" node="6SkxsMzDp28" resolve="bnd" />
+                                        </node>
+                                        <node concept="liA8E" id="3gNap3fZkUu" role="2OqNvi">
+                                          <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                        </node>
+                                      </node>
+                                      <node concept="3uibUv" id="3gNap3g07gl" role="3PaCim">
+                                        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3fZsjf" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3clFbH" id="3gNap3fZskp" role="3cqZAp" />
+                            <node concept="3clFbJ" id="3gNap3fZsmo" role="3cqZAp">
+                              <node concept="3clFbS" id="3gNap3fZsmq" role="3clFbx">
+                                <node concept="3clFbJ" id="3gNap3fZtZ0" role="3cqZAp">
+                                  <node concept="3clFbS" id="3gNap3fZtZ1" role="3clFbx">
+                                    <node concept="YS8fn" id="3gNap3fZtZ2" role="3cqZAp">
+                                      <node concept="2ShNRf" id="3gNap3fZtZ3" role="YScLw">
+                                        <node concept="1pGfFk" id="3gNap3fZtZ4" role="2ShVmc">
+                                          <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                                          <node concept="3cpWs3" id="3gNap3fZtZ5" role="37wK5m">
+                                            <node concept="3cpWs3" id="3gNap3fZtZ6" role="3uHU7B">
+                                              <node concept="3cpWs3" id="3gNap3fZtZ7" role="3uHU7B">
+                                                <node concept="Xl_RD" id="3gNap3fZtZ8" role="3uHU7B">
+                                                  <property role="Xl_RC" value="Values differ " />
+                                                </node>
+                                                <node concept="2OqwBi" id="3gNap3fZtZ9" role="3uHU7w">
+                                                  <node concept="37vLTw" id="3gNap3fZtZa" role="2Oq$k0">
+                                                    <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                                  </node>
+                                                  <node concept="liA8E" id="3gNap3fZtZb" role="2OqNvi">
+                                                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                                  </node>
+                                                </node>
                                               </node>
-                                              <node concept="liA8E" id="3gNap3fZtZb" role="2OqNvi">
+                                              <node concept="Xl_RD" id="3gNap3fZtZc" role="3uHU7w">
+                                                <property role="Xl_RC" value=" and " />
+                                              </node>
+                                            </node>
+                                            <node concept="2OqwBi" id="3gNap3fZufK" role="3uHU7w">
+                                              <node concept="37vLTw" id="3gNap3fZu0t" role="2Oq$k0">
+                                                <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                                              </node>
+                                              <node concept="liA8E" id="3gNap3fZuQW" role="2OqNvi">
                                                 <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
                                               </node>
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-                                          <node concept="Xl_RD" id="3gNap3fZtZc" role="3uHU7w">
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-                                            <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
-                                          </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                  <node concept="17QLQc" id="3gNap3fZtZe" role="3clFbw">
+                                    <node concept="37vLTw" id="3gNap3fZtZf" role="3uHU7B">
+                                      <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
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+                                    <node concept="2OqwBi" id="3gNap3fZtZg" role="3uHU7w">
+                                      <node concept="37vLTw" id="3gNap3fZtZh" role="2Oq$k0">
+                                        <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                      </node>
+                                      <node concept="liA8E" id="3gNap3fZtZi" role="2OqNvi">
+                                        <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                                <node concept="3clFbH" id="3gNap3fZuSi" role="3cqZAp" />
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+                              <node concept="1Wc70l" id="3gNap3fZth_" role="3clFbw">
+                                <node concept="2OqwBi" id="3gNap3fZtqo" role="3uHU7w">
+                                  <node concept="37vLTw" id="3gNap3fZtiA" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3fZtYX" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                                  </node>
+                                </node>
+                                <node concept="2OqwBi" id="3gNap3fZsy2" role="3uHU7B">
+                                  <node concept="37vLTw" id="3gNap3fZsnI" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                  </node>
+                                  <node concept="liA8E" id="3gNap3fZt9V" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                                  </node>
+                                </node>
+                              </node>
+                              <node concept="3eNFk2" id="7fidXgOaBTw" role="3eNLev">
+                                <node concept="3clFbS" id="7fidXgOaBTx" role="3eOfB_">
+                                  <node concept="3clFbF" id="7fidXgOaBTy" role="3cqZAp">
+                                    <node concept="2OqwBi" id="7fidXgOaBTz" role="3clFbG">
+                                      <node concept="37vLTw" id="7fidXgOaBT$" role="2Oq$k0">
+                                        <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
+                                      </node>
+                                      <node concept="liA8E" id="7fidXgOaBT_" role="2OqNvi">
+                                        <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical):void" resolve="union" />
+                                        <node concept="37vLTw" id="7fidXgOaBTA" role="37wK5m">
+                                          <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
                                         </node>
                                       </node>
                                     </node>
                                   </node>
                                 </node>
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-                              <node concept="17QLQc" id="3gNap3fZtZe" role="3clFbw">
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-                                  <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
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-                                  <node concept="37vLTw" id="3gNap3fZtZh" role="2Oq$k0">
+                                <node concept="3y3z36" id="7fidXgOaCdn" role="3eO9$A">
+                                  <node concept="37vLTw" id="7fidXgOaCek" role="3uHU7w">
+                                    <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
+                                  </node>
+                                  <node concept="37vLTw" id="7fidXgOaBU$" role="3uHU7B">
                                     <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
                                   </node>
-                                  <node concept="liA8E" id="3gNap3fZtZi" role="2OqNvi">
-                                    <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
-                                  </node>
                                 </node>
                               </node>
                             </node>
-                            <node concept="3clFbH" id="3gNap3fZuSi" role="3cqZAp" />
+                            <node concept="3clFbH" id="3gNap3fZkKL" role="3cqZAp" />
                           </node>
-                          <node concept="1Wc70l" id="3gNap3fZth_" role="3clFbw">
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-                              <node concept="37vLTw" id="3gNap3fZtiA" role="2Oq$k0">
-                                <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
-                              </node>
-                              <node concept="liA8E" id="3gNap3fZtYX" role="2OqNvi">
-                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
-                              </node>
-                            </node>
-                            <node concept="2OqwBi" id="3gNap3fZsy2" role="3uHU7B">
-                              <node concept="37vLTw" id="3gNap3fZsnI" role="2Oq$k0">
-                                <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
-                              </node>
-                              <node concept="liA8E" id="3gNap3fZt9V" role="2OqNvi">
-                                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
-                              </node>
-                            </node>
-                          </node>
-                          <node concept="3eNFk2" id="7fidXgOaBTw" role="3eNLev">
-                            <node concept="3clFbS" id="7fidXgOaBTx" role="3eOfB_">
-                              <node concept="3clFbF" id="7fidXgOaBTy" role="3cqZAp">
-                                <node concept="2OqwBi" id="7fidXgOaBTz" role="3clFbG">
-                                  <node concept="37vLTw" id="7fidXgOaBT$" role="2Oq$k0">
-                                    <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
-                                  </node>
-                                  <node concept="liA8E" id="7fidXgOaBT_" role="2OqNvi">
-                                    <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical):void" resolve="union" />
-                                    <node concept="37vLTw" id="7fidXgOaBTA" role="37wK5m">
-                                      <ref role="3cqZAo" node="3gNap3fZkKR" resolve="right" />
-                                    </node>
-                                  </node>
+                        </node>
+                      </node>
+                      <node concept="1rXfSq" id="3gNap3fZijZ" role="3eO9$A">
+                        <ref role="37wK5l" node="3gNap3fZhXk" resolve="isLogicalValue" />
+                        <node concept="37vLTw" id="3gNap3fZikO" role="37wK5m">
+                          <ref role="3cqZAo" node="1Ns6gpY7SoX" resolve="bvar" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="3cpWsn" id="6SkxsMzDp28" role="1Duv9x">
+                  <property role="TrG5h" value="bnd" />
+                  <node concept="3uibUv" id="6SkxsMzDp2c" role="1tU5fm">
+                    <ref role="3uigEE" to="yt73:~Substitution$Binding" resolve="Substitution.Binding" />
+                  </node>
+                </node>
+                <node concept="2OqwBi" id="6SkxsMzDp2d" role="1DdaDG">
+                  <node concept="37vLTw" id="6SkxsMzDp2e" role="2Oq$k0">
+                    <ref role="3cqZAo" node="7K4Mb_J$cIB" resolve="subs" />
+                  </node>
+                  <node concept="liA8E" id="6SkxsMzDp2f" role="2OqNvi">
+                    <ref role="37wK5l" to="yt73:~Substitution.bindings():java.util.Collection" resolve="bindings" />
+                  </node>
+                </node>
+              </node>
+              <node concept="3SKdUt" id="6SkxsMzE_KM" role="3cqZAp">
+                <node concept="3SKdUq" id="6SkxsMzEA5A" role="3SKWNk">
+                  <property role="3SKdUp" value="unification succeeded and all the bindings have been processed" />
+                </node>
+              </node>
+              <node concept="3clFbH" id="5TfjU0x$3Ww" role="3cqZAp" />
+            </node>
+            <node concept="1Wc70l" id="5TfjU0x$gbc" role="3clFbw">
+              <node concept="2ZW3vV" id="5TfjU0x$hTj" role="3uHU7w">
+                <node concept="3uibUv" id="5TfjU0x$ihm" role="2ZW6by">
+                  <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+                </node>
+                <node concept="37vLTw" id="5TfjU0x$htV" role="2ZW6bz">
+                  <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
+                </node>
+              </node>
+              <node concept="2ZW3vV" id="5TfjU0x$9Q3" role="3uHU7B">
+                <node concept="3uibUv" id="5TfjU0x$b3W" role="2ZW6by">
+                  <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+                </node>
+                <node concept="37vLTw" id="5TfjU0x$677" role="2ZW6bz">
+                  <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
+                </node>
+              </node>
+            </node>
+            <node concept="9aQIb" id="5TfjU0x$wjI" role="9aQIa">
+              <node concept="3clFbS" id="5TfjU0x$wjJ" role="9aQI4">
+                <node concept="3clFbJ" id="5TfjU0x$$Lo" role="3cqZAp">
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+                    <node concept="37vLTw" id="5TfjU0x$$Lq" role="3uHU7w">
+                      <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
+                    </node>
+                    <node concept="37vLTw" id="5TfjU0x$$Lr" role="3uHU7B">
+                      <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
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+                  </node>
+                  <node concept="3clFbS" id="5TfjU0x$$Ls" role="3clFbx">
+                    <node concept="YS8fn" id="5TfjU0x$$Lt" role="3cqZAp">
+                      <node concept="2ShNRf" id="5TfjU0x$$Lu" role="YScLw">
+                        <node concept="1pGfFk" id="5TfjU0x$$Lv" role="2ShVmc">
+                          <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                          <node concept="3cpWs3" id="5TfjU0x$$Lw" role="37wK5m">
+                            <node concept="3cpWs3" id="5TfjU0x$$Lx" role="3uHU7B">
+                              <node concept="3cpWs3" id="5TfjU0x$$Ly" role="3uHU7B">
+                                <node concept="Xl_RD" id="5TfjU0x$$Lz" role="3uHU7B">
+                                  <property role="Xl_RC" value="Values differ " />
+                                </node>
+                                <node concept="37vLTw" id="5TfjU0x$$L$" role="3uHU7w">
+                                  <ref role="3cqZAo" node="6GYQG_SpvAH" resolve="leftVal" />
                                 </node>
                               </node>
+                              <node concept="Xl_RD" id="5TfjU0x$$L_" role="3uHU7w">
+                                <property role="Xl_RC" value=" and " />
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                             </node>
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-                                <ref role="3cqZAo" node="3gNap3fZrMs" resolve="left" />
-                              </node>
+                            <node concept="37vLTw" id="5TfjU0x$$LA" role="3uHU7w">
+                              <ref role="3cqZAo" node="6GYQG_SpvAJ" resolve="rightVal" />
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                           </node>
                         </node>
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-            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-          </node>
+        <node concept="16euLQ" id="5TfjU0xzNnP" role="16eVyc">
+          <property role="TrG5h" value="T" />
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       <node concept="2tJIrI" id="4U_yxogBZ9l" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogBZsK" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="tell_term_logical" />
+        <property role="TrG5h" value="tellUni_val_logical" />
         <node concept="37vLTG" id="4U_yxogBZsL" role="3clF46">
           <property role="TrG5h" value="leftVal" />
-          <node concept="16syzq" id="6MYr6Jw$tXX" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6Jw$si$" resolve="TERM" />
+          <node concept="3uibUv" id="5TfjU0xyiW7" role="1tU5fm">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
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         </node>
         <node concept="37vLTG" id="4U_yxogBZsN" role="3clF46">
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           <node concept="3uibUv" id="6MYr6Jwz28e" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$v4o" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$si$" resolve="TERM" />
+            <node concept="16syzq" id="5TfjU0xzHrn" role="11_B2D">
+              <ref role="16sUi3" node="5TfjU0xzEQN" resolve="T" />
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@@ -2004,7 +2041,7 @@
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           <node concept="3clFbF" id="1bm7a6EV6Wo" role="3cqZAp">
             <node concept="1rXfSq" id="1bm7a6EV6Wn" role="3clFbG">
-              <ref role="37wK5l" node="4U_yxogBZLB" resolve="tell_logical_term" />
+              <ref role="37wK5l" node="4U_yxogBZLB" resolve="tellUni_logical_val" />
               <node concept="37vLTw" id="1bm7a6EV7k2" role="37wK5m">
                 <ref role="3cqZAo" node="4U_yxogBZsN" resolve="right" />
               </node>
@@ -2014,187 +2051,265 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="6MYr6Jw$si$" role="16eVyc">
-          <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="6MYr6Jw$tw5" role="3ztrMU">
-            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-          </node>
+        <node concept="16euLQ" id="5TfjU0xzEQN" role="16eVyc">
+          <property role="TrG5h" value="T" />
         </node>
       </node>
       <node concept="2tJIrI" id="4U_yxogBZsJ" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogBZLB" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="tell_logical_term" />
+        <property role="TrG5h" value="tellUni_logical_val" />
         <node concept="37vLTG" id="4U_yxogBZLE" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28h" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$$48" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$xTR" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="5TfjU0xJquy" role="11_B2D" />
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogBZLC" role="3clF46">
           <property role="TrG5h" value="rightVal" />
-          <node concept="16syzq" id="6MYr6Jw$_FT" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6Jw$xTR" resolve="TERM" />
+          <node concept="3uibUv" id="5TfjU0xyoB$" role="1tU5fm">
+            <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
           </node>
         </node>
         <node concept="3cqZAl" id="4U_yxogBZLG" role="3clF45" />
         <node concept="3Tm6S6" id="3gNap3fZftW" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogBZLL" role="3clF47">
-          <node concept="3cpWs8" id="7d$oK1$qfYc" role="3cqZAp">
-            <node concept="3cpWsn" id="7d$oK1$qfYd" role="3cpWs9">
-              <property role="TrG5h" value="leftRepr" />
-              <node concept="3uibUv" id="6MYr6Jwz28k" role="1tU5fm">
-                <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="16syzq" id="6MYr6JwA0OY" role="11_B2D">
-                  <ref role="16sUi3" node="6MYr6Jw$xTR" resolve="TERM" />
-                </node>
-              </node>
-              <node concept="2OqwBi" id="7d$oK1$qfYf" role="33vP2m">
-                <node concept="37vLTw" id="7d$oK1$qfYg" role="2Oq$k0">
-                  <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
-                </node>
-                <node concept="liA8E" id="7d$oK1$qfYh" role="2OqNvi">
-                  <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbH" id="1bm7a6EV0yc" role="3cqZAp" />
-          <node concept="3cpWs8" id="1bm7a6EUZWd" role="3cqZAp">
-            <node concept="3cpWsn" id="1bm7a6EUZWe" role="3cpWs9">
-              <property role="TrG5h" value="leftVal" />
-              <node concept="3uibUv" id="6MYr6JwzAEt" role="1tU5fm">
-                <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-              </node>
-              <node concept="2OqwBi" id="1bm7a6EUZWf" role="33vP2m">
-                <node concept="37vLTw" id="7d$oK1$qgWW" role="2Oq$k0">
-                  <ref role="3cqZAo" node="7d$oK1$qfYd" resolve="leftRepr" />
-                </node>
-                <node concept="liA8E" id="1bm7a6EUZWh" role="2OqNvi">
-                  <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
-                </node>
-              </node>
-            </node>
-          </node>
           <node concept="3clFbJ" id="1bm7a6EV2Np" role="3cqZAp">
             <node concept="3clFbS" id="1bm7a6EV2Ns" role="3clFbx">
-              <node concept="3SKdUt" id="_oAIrg3oNr" role="3cqZAp">
-                <node concept="3SKdUq" id="_oAIrg3oNt" role="3SKWNk">
-                  <property role="3SKdUp" value="check for occurrences of the logical in the value" />
+              <node concept="3cpWs8" id="5TfjU0xyTSR" role="3cqZAp">
+                <node concept="3cpWsn" id="5TfjU0xyTSS" role="3cpWs9">
+                  <property role="TrG5h" value="cls" />
+                  <node concept="3uibUv" id="5TfjU0xyTST" role="1tU5fm">
+                    <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+                    <node concept="3qTvmN" id="5TfjU0xyTSU" role="11_B2D" />
+                  </node>
+                  <node concept="2EnYce" id="5TfjU0xyXM2" role="33vP2m">
+                    <node concept="2OqwBi" id="5TfjU0xzoke" role="2Oq$k0">
+                      <node concept="2OqwBi" id="5TfjU0xJlIO" role="2Oq$k0">
+                        <node concept="37vLTw" id="5TfjU0xJlfk" role="2Oq$k0">
+                          <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                        </node>
+                        <node concept="liA8E" id="5TfjU0xJlWX" role="2OqNvi">
+                          <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                        </node>
+                      </node>
+                      <node concept="liA8E" id="5TfjU0xzokg" role="2OqNvi">
+                        <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="5TfjU0xyYi0" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
+                    </node>
+                  </node>
                 </node>
               </node>
-              <node concept="3cpWs8" id="_oAIrg3tHb" role="3cqZAp">
-                <node concept="3cpWsn" id="_oAIrg3tHc" role="3cpWs9">
-                  <property role="TrG5h" value="subs" />
-                  <node concept="3uibUv" id="_oAIrg3tH2" role="1tU5fm">
-                    <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
-                  </node>
-                  <node concept="2OqwBi" id="6OkhGGhHQGF" role="33vP2m">
-                    <node concept="10M0yZ" id="6OkhGGhHQxS" role="2Oq$k0">
-                      <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
-                      <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
-                    </node>
-                    <node concept="liA8E" id="6OkhGGhHQRO" role="2OqNvi">
-                      <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
-                      <node concept="2ShNRf" id="_oAIrg3tHe" role="37wK5m">
-                        <node concept="1pGfFk" id="_oAIrg3tHf" role="2ShVmc">
-                          <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
-                          <node concept="37vLTw" id="6HKur8$jCv_" role="37wK5m">
-                            <ref role="3cqZAo" node="7d$oK1$qfYd" resolve="leftRepr" />
+              <node concept="3clFbJ" id="5TfjU0xyZgf" role="3cqZAp">
+                <node concept="3clFbS" id="5TfjU0xyZgh" role="3clFbx">
+                  <node concept="3cpWs8" id="5TfjU0xzbJk" role="3cqZAp">
+                    <node concept="3cpWsn" id="5TfjU0xzbJl" role="3cpWs9">
+                      <property role="TrG5h" value="termLeftRepr" />
+                      <node concept="3uibUv" id="5TfjU0xzbJ4" role="1tU5fm">
+                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                        <node concept="16syzq" id="5TfjU0xzbJ7" role="11_B2D">
+                          <ref role="16sUi3" node="5TfjU0xz4dl" resolve="TERM" />
+                        </node>
+                      </node>
+                      <node concept="10QFUN" id="5TfjU0xzbJm" role="33vP2m">
+                        <node concept="2OqwBi" id="5TfjU0xJnV7" role="10QFUP">
+                          <node concept="37vLTw" id="5TfjU0xJnE6" role="2Oq$k0">
+                            <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                          </node>
+                          <node concept="liA8E" id="5TfjU0xJoCP" role="2OqNvi">
+                            <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                          </node>
+                        </node>
+                        <node concept="3uibUv" id="5TfjU0xzbJo" role="10QFUM">
+                          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                          <node concept="16syzq" id="5TfjU0xzbJp" role="11_B2D">
+                            <ref role="16sUi3" node="5TfjU0xz4dl" resolve="TERM" />
                           </node>
                         </node>
                       </node>
-                      <node concept="37vLTw" id="_oAIrg3tHh" role="37wK5m">
-                        <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
-                      </node>
                     </node>
                   </node>
-                </node>
-              </node>
-              <node concept="3clFbJ" id="_oAIrg3tWG" role="3cqZAp">
-                <node concept="3clFbS" id="_oAIrg3tWH" role="3clFbx">
-                  <node concept="YS8fn" id="_oAIrg3tWI" role="3cqZAp">
-                    <node concept="2ShNRf" id="_oAIrg3tWJ" role="YScLw">
-                      <node concept="1pGfFk" id="_oAIrg3tWK" role="2ShVmc">
-                        <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
-                        <node concept="3cpWs3" id="_oAIrg3tWL" role="37wK5m">
-                          <node concept="3cpWs3" id="_oAIrg3tWM" role="3uHU7B">
-                            <node concept="3cpWs3" id="_oAIrg3tWN" role="3uHU7B">
-                              <node concept="3cpWs3" id="_oAIrg3tWO" role="3uHU7B">
-                                <node concept="3cpWs3" id="_oAIrg3tWP" role="3uHU7B">
-                                  <node concept="Xl_RD" id="_oAIrg3tWQ" role="3uHU7B">
-                                    <property role="Xl_RC" value="Cannot unify " />
-                                  </node>
-                                  <node concept="37vLTw" id="_oAIrg3uzQ" role="3uHU7w">
-                                    <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
-                                  </node>
-                                </node>
-                                <node concept="Xl_RD" id="_oAIrg3tWS" role="3uHU7w">
-                                  <property role="Xl_RC" value=" and " />
-                                </node>
+                  <node concept="3SKdUt" id="_oAIrg3oNr" role="3cqZAp">
+                    <node concept="3SKdUq" id="_oAIrg3oNt" role="3SKWNk">
+                      <property role="3SKdUp" value="check for occurrences of the logical in the value" />
+                    </node>
+                  </node>
+                  <node concept="3cpWs8" id="_oAIrg3tHb" role="3cqZAp">
+                    <node concept="3cpWsn" id="_oAIrg3tHc" role="3cpWs9">
+                      <property role="TrG5h" value="subs" />
+                      <node concept="3uibUv" id="_oAIrg3tH2" role="1tU5fm">
+                        <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
+                      </node>
+                      <node concept="2OqwBi" id="6OkhGGhHQGF" role="33vP2m">
+                        <node concept="10M0yZ" id="6OkhGGhHQxS" role="2Oq$k0">
+                          <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
+                          <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
+                        </node>
+                        <node concept="liA8E" id="6OkhGGhHQRO" role="2OqNvi">
+                          <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
+                          <node concept="2ShNRf" id="_oAIrg3tHe" role="37wK5m">
+                            <node concept="1pGfFk" id="_oAIrg3tHf" role="2ShVmc">
+                              <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
+                              <node concept="37vLTw" id="5TfjU0xzgyl" role="37wK5m">
+                                <ref role="3cqZAo" node="5TfjU0xzbJl" resolve="termLeftRepr" />
                               </node>
-                              <node concept="37vLTw" id="_oAIrg3tWT" role="3uHU7w">
-                                <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
-                              </node>
-                            </node>
-                            <node concept="Xl_RD" id="_oAIrg3tWU" role="3uHU7w">
-                              <property role="Xl_RC" value=": " />
                             </node>
                           </node>
-                          <node concept="1rXfSq" id="_oAIrg3tWV" role="3uHU7w">
-                            <ref role="37wK5l" node="1MWQR5SpMLA" resolve="formatMessage" />
-                            <node concept="37vLTw" id="_oAIrg3tWW" role="37wK5m">
-                              <ref role="3cqZAo" node="_oAIrg3tHc" resolve="subs" />
+                          <node concept="10QFUN" id="5TfjU0xyJmX" role="37wK5m">
+                            <node concept="16syzq" id="5TfjU0xzgQz" role="10QFUM">
+                              <ref role="16sUi3" node="5TfjU0xz4dl" resolve="TERM" />
+                            </node>
+                            <node concept="37vLTw" id="5TfjU0xyJmW" role="10QFUP">
+                              <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
                             </node>
                           </node>
                         </node>
                       </node>
                     </node>
                   </node>
-                </node>
-                <node concept="3fqX7Q" id="_oAIrg3tWX" role="3clFbw">
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-                    <node concept="37vLTw" id="_oAIrg3tWZ" role="2Oq$k0">
-                      <ref role="3cqZAo" node="_oAIrg3tHc" resolve="subs" />
+                  <node concept="3clFbJ" id="_oAIrg3tWG" role="3cqZAp">
+                    <node concept="3clFbS" id="_oAIrg3tWH" role="3clFbx">
+                      <node concept="YS8fn" id="_oAIrg3tWI" role="3cqZAp">
+                        <node concept="2ShNRf" id="_oAIrg3tWJ" role="YScLw">
+                          <node concept="1pGfFk" id="_oAIrg3tWK" role="2ShVmc">
+                            <ref role="37wK5l" to="w7la:~EvaluationFailureException.&lt;init&gt;(java.lang.String)" resolve="EvaluationFailureException" />
+                            <node concept="3cpWs3" id="_oAIrg3tWL" role="37wK5m">
+                              <node concept="3cpWs3" id="_oAIrg3tWM" role="3uHU7B">
+                                <node concept="3cpWs3" id="_oAIrg3tWN" role="3uHU7B">
+                                  <node concept="3cpWs3" id="_oAIrg3tWO" role="3uHU7B">
+                                    <node concept="3cpWs3" id="_oAIrg3tWP" role="3uHU7B">
+                                      <node concept="Xl_RD" id="_oAIrg3tWQ" role="3uHU7B">
+                                        <property role="Xl_RC" value="Cannot unify " />
+                                      </node>
+                                      <node concept="37vLTw" id="_oAIrg3uzQ" role="3uHU7w">
+                                        <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                                      </node>
+                                    </node>
+                                    <node concept="Xl_RD" id="_oAIrg3tWS" role="3uHU7w">
+                                      <property role="Xl_RC" value=" and " />
+                                    </node>
+                                  </node>
+                                  <node concept="37vLTw" id="_oAIrg3tWT" role="3uHU7w">
+                                    <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
+                                  </node>
+                                </node>
+                                <node concept="Xl_RD" id="_oAIrg3tWU" role="3uHU7w">
+                                  <property role="Xl_RC" value=": " />
+                                </node>
+                              </node>
+                              <node concept="1rXfSq" id="_oAIrg3tWV" role="3uHU7w">
+                                <ref role="37wK5l" node="1MWQR5SpMLA" resolve="formatMessage" />
+                                <node concept="37vLTw" id="_oAIrg3tWW" role="37wK5m">
+                                  <ref role="3cqZAo" node="_oAIrg3tHc" resolve="subs" />
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
                     </node>
-                    <node concept="liA8E" id="_oAIrg3tX0" role="2OqNvi">
-                      <ref role="37wK5l" to="yt73:~Substitution.isSuccessful():boolean" resolve="isSuccessful" />
+                    <node concept="3fqX7Q" id="_oAIrg3tWX" role="3clFbw">
+                      <node concept="2OqwBi" id="_oAIrg3tWY" role="3fr31v">
+                        <node concept="37vLTw" id="_oAIrg3tWZ" role="2Oq$k0">
+                          <ref role="3cqZAo" node="_oAIrg3tHc" resolve="subs" />
+                        </node>
+                        <node concept="liA8E" id="_oAIrg3tX0" role="2OqNvi">
+                          <ref role="37wK5l" to="yt73:~Substitution.isSuccessful():boolean" resolve="isSuccessful" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbH" id="5TfjU0xz0Ak" role="3cqZAp" />
+                </node>
+                <node concept="1Wc70l" id="5TfjU0xz0aw" role="3clFbw">
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+                    <node concept="10Nm6u" id="5TfjU0xz0ay" role="3uHU7w" />
+                    <node concept="37vLTw" id="5TfjU0xz0az" role="3uHU7B">
+                      <ref role="3cqZAo" node="5TfjU0xyTSS" resolve="cls" />
+                    </node>
+                  </node>
+                  <node concept="2OqwBi" id="5TfjU0xz0a$" role="3uHU7w">
+                    <node concept="3VsKOn" id="5TfjU0xz0a_" role="2Oq$k0">
+                      <ref role="3VsUkX" to="yt73:~Term" resolve="Term" />
+                    </node>
+                    <node concept="liA8E" id="5TfjU0xz0aA" role="2OqNvi">
+                      <ref role="37wK5l" to="wyt6:~Class.isAssignableFrom(java.lang.Class):boolean" resolve="isAssignableFrom" />
+                      <node concept="37vLTw" id="5TfjU0xz0aB" role="37wK5m">
+                        <ref role="3cqZAo" node="5TfjU0xyTSS" resolve="cls" />
+                      </node>
                     </node>
                   </node>
                 </node>
               </node>
-              <node concept="3clFbH" id="_oAIrg3oLE" role="3cqZAp" />
+              <node concept="3clFbH" id="5TfjU0xziff" role="3cqZAp" />
               <node concept="3clFbF" id="1bm7a6EV48H" role="3cqZAp">
                 <node concept="2OqwBi" id="1bm7a6EV4cC" role="3clFbG">
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-                    <ref role="3cqZAo" node="7d$oK1$qfYd" resolve="leftRepr" />
+                  <node concept="2OqwBi" id="5TfjU0xJdnP" role="2Oq$k0">
+                    <node concept="1eOMI4" id="5TfjU0xJuYo" role="2Oq$k0">
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+                        <node concept="3uibUv" id="5TfjU0xJExW" role="10QFUM">
+                          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                          <node concept="16syzq" id="5TfjU0xJEUO" role="11_B2D">
+                            <ref role="16sUi3" node="5TfjU0xJAYc" resolve="T" />
+                          </node>
+                        </node>
+                        <node concept="37vLTw" id="5TfjU0xJuYq" role="10QFUP">
+                          <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="5TfjU0xJdVt" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                    </node>
                   </node>
                   <node concept="liA8E" id="1bm7a6EV5ci" role="2OqNvi">
                     <ref role="37wK5l" to="bj13:~JoinableLogical.setValue(java.lang.Object):void" resolve="setValue" />
-                    <node concept="37vLTw" id="1bm7a6EV5e0" role="37wK5m">
-                      <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
+                    <node concept="1eOMI4" id="5TfjU0xyP_X" role="37wK5m">
+                      <node concept="10QFUN" id="5TfjU0xyP_U" role="1eOMHV">
+                        <node concept="16syzq" id="5TfjU0xJFts" role="10QFUM">
+                          <ref role="16sUi3" node="5TfjU0xJAYc" resolve="T" />
+                        </node>
+                        <node concept="37vLTw" id="5TfjU0xyPBr" role="10QFUP">
+                          <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
+                        </node>
+                      </node>
                     </node>
                   </node>
                 </node>
               </node>
               <node concept="3clFbH" id="1bm7a6EV5AJ" role="3cqZAp" />
             </node>
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-              <node concept="10Nm6u" id="1bm7a6EV3fP" role="3uHU7w" />
-              <node concept="37vLTw" id="1bm7a6EV2Ww" role="3uHU7B">
-                <ref role="3cqZAo" node="1bm7a6EUZWe" resolve="leftVal" />
+            <node concept="3fqX7Q" id="5TfjU0xJggO" role="3clFbw">
+              <node concept="2OqwBi" id="5TfjU0xJggQ" role="3fr31v">
+                <node concept="37vLTw" id="5TfjU0xJggR" role="2Oq$k0">
+                  <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                </node>
+                <node concept="liA8E" id="5TfjU0xJggS" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                </node>
               </node>
             </node>
             <node concept="9aQIb" id="1bm7a6EV3hd" role="9aQIa">
               <node concept="3clFbS" id="1bm7a6EV3he" role="9aQI4">
                 <node concept="3clFbF" id="6SkxsMzEU$Q" role="3cqZAp">
                   <node concept="1rXfSq" id="6SkxsMzEU$P" role="3clFbG">
-                    <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tell_term_term" />
-                    <node concept="37vLTw" id="6SkxsMzEUWY" role="37wK5m">
-                      <ref role="3cqZAo" node="1bm7a6EUZWe" resolve="leftVal" />
+                    <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tellUni_val_val" />
+                    <node concept="2OqwBi" id="5TfjU0xJhdi" role="37wK5m">
+                      <node concept="2OqwBi" id="5TfjU0xJmKW" role="2Oq$k0">
+                        <node concept="37vLTw" id="5TfjU0xJmFW" role="2Oq$k0">
+                          <ref role="3cqZAo" node="4U_yxogBZLE" resolve="left" />
+                        </node>
+                        <node concept="liA8E" id="5TfjU0xJnkE" role="2OqNvi">
+                          <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                        </node>
+                      </node>
+                      <node concept="liA8E" id="5TfjU0xJhdk" role="2OqNvi">
+                        <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                      </node>
                     </node>
                     <node concept="37vLTw" id="6SkxsMzEV29" role="37wK5m">
                       <ref role="3cqZAo" node="4U_yxogBZLC" resolve="rightVal" />
@@ -2205,9 +2320,12 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="6MYr6Jw$xTR" role="16eVyc">
+        <node concept="16euLQ" id="5TfjU0xJAYc" role="16eVyc">
+          <property role="TrG5h" value="T" />
+        </node>
+        <node concept="16euLQ" id="5TfjU0xz4dl" role="16eVyc">
           <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="6MYr6Jw$zyw" role="3ztrMU">
+          <node concept="3uibUv" id="5TfjU0xzb8Y" role="3ztrMU">
             <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
           </node>
         </node>
@@ -2215,44 +2333,36 @@
       <node concept="2tJIrI" id="4U_yxogBZLA" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC05I" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="tell_logical_logical" />
+        <property role="TrG5h" value="tellUni_logical_logical" />
         <node concept="37vLTG" id="4U_yxogC05J" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28n" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="3qTvmN" id="7BhUeN7wuY_" role="11_B2D" />
+            <node concept="16syzq" id="5TfjU0xzy_y" role="11_B2D">
+              <ref role="16sUi3" node="5TfjU0xzvGM" resolve="T" />
+            </node>
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogC0jU" role="3clF46">
           <property role="TrG5h" value="right" />
           <node concept="3uibUv" id="6MYr6Jwz28q" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="3qTvmN" id="7BhUeN7wuZr" role="11_B2D" />
+            <node concept="16syzq" id="5TfjU0xzz_q" role="11_B2D">
+              <ref role="16sUi3" node="5TfjU0xzvGM" resolve="T" />
+            </node>
           </node>
         </node>
         <node concept="3cqZAl" id="4U_yxogC05N" role="3clF45" />
         <node concept="3Tm6S6" id="3gNap3fZftZ" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC05S" role="3clF47">
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-            <node concept="3clFbS" id="4U_yxogDsYG" role="3clFbx">
-              <node concept="3cpWs6" id="4U_yxogDtRP" role="3cqZAp" />
-            </node>
-            <node concept="3clFbC" id="4U_yxogDt6$" role="3clFbw">
-              <node concept="37vLTw" id="4U_yxogDtvd" role="3uHU7w">
-                <ref role="3cqZAo" node="4U_yxogC0jU" resolve="right" />
-              </node>
-              <node concept="37vLTw" id="4U_yxogDsZV" role="3uHU7B">
-                <ref role="3cqZAo" node="4U_yxogC05J" resolve="left" />
-              </node>
-            </node>
-          </node>
-          <node concept="3clFbH" id="4U_yxogDtSL" role="3cqZAp" />
           <node concept="3cpWs8" id="7d$oK1$rAnD" role="3cqZAp">
             <node concept="3cpWsn" id="7d$oK1$rAnE" role="3cpWs9">
               <property role="TrG5h" value="leftRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28t" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qTvmN" id="7BhUeN7wv14" role="11_B2D" />
+                <node concept="16syzq" id="5TfjU0xz$x6" role="11_B2D">
+                  <ref role="16sUi3" node="5TfjU0xzvGM" resolve="T" />
+                </node>
               </node>
               <node concept="2OqwBi" id="7d$oK1$rAnG" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$rAnH" role="2Oq$k0">
@@ -2269,7 +2379,9 @@
               <property role="TrG5h" value="rightRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28w" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qTvmN" id="7BhUeN7wv1R" role="11_B2D" />
+                <node concept="16syzq" id="5TfjU0xz_b9" role="11_B2D">
+                  <ref role="16sUi3" node="5TfjU0xzvGM" resolve="T" />
+                </node>
               </node>
               <node concept="2OqwBi" id="7d$oK1$rAnM" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$rAnN" role="2Oq$k0">
@@ -2281,7 +2393,6 @@
               </node>
             </node>
           </node>
-          <node concept="3clFbH" id="4U_yxogDxtv" role="3cqZAp" />
           <node concept="3clFbJ" id="4U_yxogDxEc" role="3cqZAp">
             <node concept="3clFbS" id="4U_yxogDxEf" role="3clFbx">
               <node concept="3cpWs6" id="4U_yxogDybj" role="3cqZAp" />
@@ -2296,371 +2407,139 @@
             </node>
           </node>
           <node concept="3clFbH" id="4U_yxogDycf" role="3cqZAp" />
-          <node concept="3cpWs8" id="7BhUeN7wATM" role="3cqZAp">
-            <node concept="3cpWsn" id="7BhUeN7wATN" role="3cpWs9">
-              <property role="TrG5h" value="metaLogical" />
-              <node concept="3uibUv" id="7BhUeN7wATE" role="1tU5fm">
-                <ref role="3uigEE" to="bj13:~MetaLogical" resolve="MetaLogical" />
-                <node concept="3qTvmN" id="7BhUeN7wATH" role="11_B2D" />
-              </node>
-              <node concept="3K4zz7" id="7BhUeN7wATO" role="33vP2m">
-                <node concept="2OqwBi" id="7BhUeN7wATP" role="3K4E3e">
-                  <node concept="37vLTw" id="7BhUeN7wATQ" role="2Oq$k0">
-                    <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
-                  </node>
-                  <node concept="liA8E" id="7BhUeN7wATR" role="2OqNvi">
-                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
-                  </node>
-                </node>
-                <node concept="2OqwBi" id="7BhUeN7wATS" role="3K4GZi">
-                  <node concept="37vLTw" id="7BhUeN7wATT" role="2Oq$k0">
-                    <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
-                  </node>
-                  <node concept="liA8E" id="7BhUeN7wATU" role="2OqNvi">
-                    <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
-                  </node>
-                </node>
-                <node concept="3y3z36" id="7BhUeN7wATV" role="3K4Cdx">
-                  <node concept="10Nm6u" id="7BhUeN7wATW" role="3uHU7w" />
-                  <node concept="2OqwBi" id="7BhUeN7wATX" role="3uHU7B">
-                    <node concept="37vLTw" id="7BhUeN7wATY" role="2Oq$k0">
+          <node concept="3clFbJ" id="5TfjU0xIiER" role="3cqZAp">
+            <node concept="3clFbS" id="5TfjU0xIiES" role="3clFbx">
+              <node concept="3clFbF" id="5TfjU0xIlah" role="3cqZAp">
+                <node concept="1rXfSq" id="5TfjU0xIiEU" role="3clFbG">
+                  <ref role="37wK5l" node="6GYQG_SpvAG" resolve="tellUni_val_val" />
+                  <node concept="2OqwBi" id="5TfjU0xIiEV" role="37wK5m">
+                    <node concept="37vLTw" id="5TfjU0xIiEW" role="2Oq$k0">
                       <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
                     </node>
-                    <node concept="liA8E" id="7BhUeN7wATZ" role="2OqNvi">
-                      <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                    <node concept="liA8E" id="5TfjU0xIiEX" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
                     </node>
                   </node>
-                </node>
-              </node>
-            </node>
-          </node>
-          <node concept="3cpWs8" id="7BhUeN7wxIH" role="3cqZAp">
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-              <property role="TrG5h" value="cls" />
-              <node concept="3uibUv" id="7BhUeN7wxI_" role="1tU5fm">
-                <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
-                <node concept="3qTvmN" id="7BhUeN7wxIC" role="11_B2D" />
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-              <node concept="2OqwBi" id="7BhUeN7wCdX" role="33vP2m">
-                <node concept="37vLTw" id="7BhUeN7wAU0" role="2Oq$k0">
-                  <ref role="3cqZAo" node="7BhUeN7wATN" resolve="metaLogical" />
-                </node>
-                <node concept="liA8E" id="7fidXgO2CQD" role="2OqNvi">
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-          <node concept="3clFbH" id="7BhUeN7wv4G" role="3cqZAp" />
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-                  <node concept="3uibUv" id="7BhUeN7wWKf" role="1tU5fm">
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-                    <node concept="3uibUv" id="7BhUeN7wWKy" role="10QFUM">
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-                  <node concept="3uibUv" id="7BhUeN7wWPT" role="1tU5fm">
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-                    <node concept="16syzq" id="7BhUeN7wWPW" role="11_B2D">
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-                    <node concept="37vLTw" id="7BhUeN7wWQ4" role="10QFUP">
+                  <node concept="2OqwBi" id="5TfjU0xIiEY" role="37wK5m">
+                    <node concept="37vLTw" id="5TfjU0xIiEZ" role="2Oq$k0">
                       <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
                     </node>
-                    <node concept="3uibUv" id="7BhUeN7wWQ5" role="10QFUM">
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-                        <ref role="16sUi3" node="7BhUeN7wHwQ" resolve="TERM" />
-                      </node>
+                    <node concept="liA8E" id="5TfjU0xIiF0" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
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-                        <node concept="1pGfFk" id="_oAIrg3wr7" role="2ShVmc">
-                          <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
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-                                  <node concept="37vLTw" id="_oAIrg3xkn" role="3uHU7w">
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-                        <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
-                      </node>
+            <node concept="1Wc70l" id="5TfjU0xIiF1" role="3clFbw">
+              <node concept="2OqwBi" id="5TfjU0xIiF2" role="3uHU7w">
+                <node concept="37vLTw" id="5TfjU0xIiF3" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
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+                <node concept="liA8E" id="5TfjU0xIiF4" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                </node>
+              </node>
+              <node concept="2OqwBi" id="5TfjU0xIiF5" role="3uHU7B">
+                <node concept="37vLTw" id="5TfjU0xIiF6" role="2Oq$k0">
+                  <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
+                </node>
+                <node concept="liA8E" id="5TfjU0xIiF7" role="2OqNvi">
+                  <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+                </node>
+              </node>
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+          <node concept="3clFbJ" id="5TfjU0xIiF8" role="3cqZAp">
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+                <node concept="1rXfSq" id="5TfjU0xIiFb" role="3clFbG">
+                  <ref role="37wK5l" node="4U_yxogBZsK" resolve="tellUni_val_logical" />
+                  <node concept="2OqwBi" id="5TfjU0xIiFc" role="37wK5m">
+                    <node concept="37vLTw" id="5TfjU0xIiFd" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
                     </node>
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-                        <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
-                      </node>
+                    <node concept="liA8E" id="5TfjU0xIiFe" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~Logical.value():java.lang.Object" resolve="value" />
+                    </node>
+                  </node>
+                  <node concept="37vLTw" id="5TfjU0xIiFf" role="37wK5m">
+                    <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="2OqwBi" id="5TfjU0xIiFg" role="3clFbw">
+              <node concept="37vLTw" id="5TfjU0xIiFh" role="2Oq$k0">
+                <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
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+              <node concept="liA8E" id="5TfjU0xIiFi" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbJ" id="5TfjU0xIiFj" role="3cqZAp">
+            <node concept="3clFbS" id="5TfjU0xIiFk" role="3clFbx">
+              <node concept="3clFbF" id="5TfjU0xI$GI" role="3cqZAp">
+                <node concept="1rXfSq" id="5TfjU0xIiFm" role="3clFbG">
+                  <ref role="37wK5l" node="4U_yxogBZLB" resolve="tellUni_logical_val" />
+                  <node concept="37vLTw" id="5TfjU0xIiFn" role="37wK5m">
+                    <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
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+                  <node concept="2OqwBi" id="5TfjU0xIiFo" role="37wK5m">
+                    <node concept="37vLTw" id="5TfjU0xIiFp" role="2Oq$k0">
+                      <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
+                    </node>
+                    <node concept="liA8E" id="5TfjU0xIiFq" role="2OqNvi">
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-                          <ref role="3uigEE" to="wyt6:~Object" resolve="Object" />
+              </node>
+            </node>
+            <node concept="2OqwBi" id="5TfjU0xIiFr" role="3clFbw">
+              <node concept="37vLTw" id="5TfjU0xIiFs" role="2Oq$k0">
+                <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
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+              <node concept="liA8E" id="5TfjU0xIiFt" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~Logical.isBound():boolean" resolve="isBound" />
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+            </node>
+          </node>
+          <node concept="3clFbF" id="7BhUeN7wHSI" role="3cqZAp">
+            <node concept="2OqwBi" id="7BhUeN7wHSJ" role="3clFbG">
+              <node concept="37vLTw" id="5TfjU0xzA$w" role="2Oq$k0">
+                <ref role="3cqZAo" node="7d$oK1$rAnE" resolve="leftRepr" />
+              </node>
+              <node concept="liA8E" id="7BhUeN7wHSL" role="2OqNvi">
+                <ref role="37wK5l" to="bj13:~JoinableLogical.union(jetbrains.mps.logic.reactor.logical.JoinableLogical,jetbrains.mps.logic.reactor.logical.JoinableLogical$ValueReconciler):void" resolve="union" />
+                <node concept="37vLTw" id="5TfjU0xTPt2" role="37wK5m">
+                  <ref role="3cqZAo" node="7d$oK1$rAnK" resolve="rightRepr" />
+                </node>
+                <node concept="1bVj0M" id="5TfjU0xTog0" role="37wK5m">
+                  <node concept="3clFbS" id="5TfjU0xTog2" role="1bW5cS">
+                    <node concept="3clFbF" id="5TfjU0xTyoI" role="3cqZAp">
+                      <node concept="1rXfSq" id="5TfjU0xTyoH" role="3clFbG">
+                        <ref role="37wK5l" node="2UGjFq4mbmq" resolve="doTell" />
+                        <node concept="37vLTw" id="5TfjU0xTzfA" role="37wK5m">
+                          <ref role="3cqZAo" node="5TfjU0xTojx" resolve="leftVal" />
+                        </node>
+                        <node concept="37vLTw" id="5TfjU0xT$_X" role="37wK5m">
+                          <ref role="3cqZAo" node="5TfjU0xTojx" resolve="leftVal" />
                         </node>
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-                <node concept="3clFbH" id="7BhUeN7xY__" role="3cqZAp" />
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-                      <ref role="3cqZAo" node="7BhUeN7xYA2" resolve="leftJRepr" />
+                  <node concept="37vLTG" id="5TfjU0xTojx" role="1bW2Oz">
+                    <property role="TrG5h" value="leftVal" />
+                    <node concept="16syzq" id="5TfjU0xTLCh" role="1tU5fm">
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-                                            <property role="Xl_RC" value="Values differ " />
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-                                          <node concept="37vLTw" id="7BhUeN7wJRY" role="3uHU7w">
-                                            <ref role="3cqZAo" node="7BhUeN7wHSO" resolve="leftVal" />
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-                                        </node>
-                                        <node concept="Xl_RD" id="7BhUeN7wJF9" role="3uHU7w">
-                                          <property role="Xl_RC" value=" and " />
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-                                      </node>
-                                      <node concept="37vLTw" id="7BhUeN7wJVl" role="3uHU7w">
-                                        <ref role="3cqZAo" node="7BhUeN7wHSQ" resolve="rightVal" />
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-                                    </node>
-                                  </node>
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                      </node>
+                  </node>
+                  <node concept="37vLTG" id="5TfjU0xTorL" role="1bW2Oz">
+                    <property role="TrG5h" value="rightVal" />
+                    <node concept="16syzq" id="5TfjU0xTNgN" role="1tU5fm">
+                      <ref role="16sUi3" node="5TfjU0xzvGM" resolve="T" />
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@@ -2668,9 +2547,12 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="7BhUeN7wHwQ" role="16eVyc">
+        <node concept="16euLQ" id="5TfjU0xzvGM" role="16eVyc">
+          <property role="TrG5h" value="T" />
+        </node>
+        <node concept="16euLQ" id="5TfjU0xTppF" role="16eVyc">
           <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="7BhUeN7wH$J" role="3ztrMU">
+          <node concept="3uibUv" id="5TfjU0xTxKd" role="3ztrMU">
             <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
           </node>
         </node>
@@ -2678,364 +2560,412 @@
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       <node concept="3clFb_" id="6GYQG_SpvAS" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="ask_term_term" />
+        <property role="TrG5h" value="askUni_val_val" />
         <node concept="37vLTG" id="6GYQG_SpvAT" role="3clF46">
           <property role="TrG5h" value="leftVal" />
-          <node concept="16syzq" id="6MYr6JwA_zT" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6JwAwZd" resolve="TERM" />
+          <node concept="16syzq" id="5TfjU0x_B3K" role="1tU5fm">
+            <ref role="16sUi3" node="5TfjU0x_pYa" resolve="T" />
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         </node>
         <node concept="37vLTG" id="6GYQG_SpvAV" role="3clF46">
           <property role="TrG5h" value="rightVal" />
-          <node concept="16syzq" id="6MYr6JwABl_" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6JwAwZd" resolve="TERM" />
+          <node concept="16syzq" id="5TfjU0x_Ep8" role="1tU5fm">
+            <ref role="16sUi3" node="5TfjU0x_pYa" resolve="T" />
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         </node>
         <node concept="37vLTG" id="4U_yxogC1eI" role="3clF46">
           <property role="TrG5h" value="right" />
           <node concept="3uibUv" id="6MYr6Jwz28z" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$Q2y" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$JBX" resolve="TERM" />
+            <node concept="16syzq" id="5TfjU0xBye8" role="11_B2D">
+              <ref role="16sUi3" node="5TfjU0xBs31" resolve="T" />
             </node>
           </node>
         </node>
@@ -3044,7 +2974,7 @@
         <node concept="3clFbS" id="4U_yxogC1eP" role="3clF47">
           <node concept="3clFbF" id="1bm7a6EVoQx" role="3cqZAp">
             <node concept="1rXfSq" id="1bm7a6EVoQw" role="3clFbG">
-              <ref role="37wK5l" node="4U_yxogC1Eh" resolve="ask_logical_term" />
+              <ref role="37wK5l" node="4U_yxogC1Eh" resolve="askUni_logical_val" />
               <node concept="37vLTw" id="1bm7a6EVpBI" role="37wK5m">
                 <ref role="3cqZAo" node="4U_yxogC1eI" resolve="right" />
               </node>
@@ -3054,223 +2984,529 @@
             </node>
           </node>
         </node>
-        <node concept="16euLQ" id="6MYr6Jw$JBX" role="16eVyc">
-          <property role="TrG5h" value="TERM" />
-          <node concept="3uibUv" id="6MYr6Jw$Mbr" role="3ztrMU">
-            <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
-          </node>
+        <node concept="16euLQ" id="5TfjU0xBs31" role="16eVyc">
+          <property role="TrG5h" value="T" />
         </node>
       </node>
       <node concept="2tJIrI" id="4U_yxogC1eE" role="jymVt" />
       <node concept="3clFb_" id="4U_yxogC1Eh" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="ask_logical_term" />
+        <property role="TrG5h" value="askUni_logical_val" />
         <node concept="37vLTG" id="4U_yxogC1Ek" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28A" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="16syzq" id="6MYr6Jw$YTR" role="11_B2D">
-              <ref role="16sUi3" node="6MYr6Jw$T5v" resolve="TERM" />
-            </node>
+            <node concept="3qTvmN" id="5TfjU0xJJxB" role="11_B2D" />
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogC1Ei" role="3clF46">
           <property role="TrG5h" value="rightVal" />
-          <node concept="16syzq" id="6MYr6Jw_0Jd" role="1tU5fm">
-            <ref role="16sUi3" node="6MYr6Jw$T5v" resolve="TERM" />
+          <node concept="16syzq" id="5TfjU0xBOsC" role="1tU5fm">
+            <ref role="16sUi3" node="5TfjU0xBAXc" resolve="T" />
           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8y$" role="3clF45" />
         <node concept="3Tm6S6" id="3gNap3fZfum" role="1B3o_S" />
         <node concept="3clFbS" id="4U_yxogC1Er" role="3clF47">
-          <node concept="3cpWs8" id="4U_yxogDnOi" role="3cqZAp">
-            <node concept="3cpWsn" id="4U_yxogDnOj" role="3cpWs9">
-              <property role="TrG5h" value="leftRepr" />
-              <node concept="3uibUv" id="6MYr6Jwz28D" role="1tU5fm">
-                <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qUE_q" id="6MYr6Jwz28E" role="11_B2D">
-                  <node concept="3uibUv" id="6MYr6Jwz28F" role="3qUE_r">
-                    <ref role="3uigEE" to="yt73:~Term" resolve="Term" />
+          <node concept="3clFbJ" id="4U_yxogDnOp" role="3cqZAp">
+            <node concept="3clFbS" id="4U_yxogDnOq" role="3clFbx">
+              <node concept="3SKdUt" id="5TfjU0xBWUg" role="3cqZAp">
+                <node concept="3SKdUq" id="5TfjU0xBWUi" role="3SKWNk">
+                  <property role="3SKdUp" value="free variable can be unified with any value" />
+                </node>
+              </node>
+              <node concept="3cpWs8" id="5TfjU0xCkrI" role="3cqZAp">
+                <node concept="3cpWsn" id="5TfjU0xCkrJ" role="3cpWs9">
+                  <property role="TrG5h" value="cls" />
+                  <node concept="3uibUv" id="5TfjU0xCkrK" role="1tU5fm">
+                    <ref role="3uigEE" to="wyt6:~Class" resolve="Class" />
+                    <node concept="3qTvmN" id="5TfjU0xCkrL" role="11_B2D" />
+                  </node>
+                  <node concept="2EnYce" id="5TfjU0xCkrM" role="33vP2m">
+                    <node concept="1eOMI4" id="5TfjU0xCkrN" role="2Oq$k0">
+                      <node concept="2OqwBi" id="5TfjU0xCkrO" role="1eOMHV">
+                        <node concept="1eOMI4" id="5TfjU0xJFHa" role="2Oq$k0">
+                          <node concept="2OqwBi" id="5TfjU0xJFH7" role="1eOMHV">
+                            <node concept="37vLTw" id="5TfjU0xJFH8" role="2Oq$k0">
+                              <ref role="3cqZAo" node="4U_yxogC1Ek" resolve="left" />
+                            </node>
+                            <node concept="liA8E" id="5TfjU0xJFH9" role="2OqNvi">
+                              <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="liA8E" id="5TfjU0xCkrQ" role="2OqNvi">
+                          <ref role="37wK5l" to="bj13:~Logical.metaLogical():jetbrains.mps.logic.reactor.logical.MetaLogical" resolve="metaLogical" />
+                        </node>
+                      </node>
+                    </node>
+                    <node concept="liA8E" id="5TfjU0xCkrR" role="2OqNvi">
+                      <ref role="37wK5l" to="bj13:~MetaLogical.type():java.lang.Class" resolve="type" />
+                    </node>
                   </node>
                 </node>
               </node>
-              <node concept="2OqwBi" id="4U_yxogDnOl" role="33vP2m">
-                <node concept="37vLTw" id="4U_yxogDock" role="2Oq$k0">
-                  <ref role="3cqZAo" node="4U_yxogC1Ek" resolve="left" />
+              <node concept="3clFbJ" id="5TfjU0xCkrS" role="3cqZAp">
+                <node concept="3clFbS" id="5TfjU0xCkrT" role="3clFbx">
+                  <node concept="3cpWs8" id="5TfjU0xCkrU" role="3cqZAp">
+                    <node concept="3cpWsn" id="5TfjU0xCkrV" role="3cpWs9">
+                      <property role="TrG5h" value="termLeftRepr" />
+                      <node concept="3uibUv" id="5TfjU0xCkrW" role="1tU5fm">
+                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                        <node concept="16syzq" id="5TfjU0xCkrX" role="11_B2D">
+                          <ref role="16sUi3" node="6MYr6Jw$T5v" resolve="TERM" />
+                        </node>
+                      </node>
+                      <node concept="10QFUN" id="5TfjU0xCkrY" role="33vP2m">
+                        <node concept="1eOMI4" id="5TfjU0xJFHe" role="10QFUP">
+                          <node concept="2OqwBi" id="5TfjU0xJFHb" role="1eOMHV">
+                            <node concept="37vLTw" id="5TfjU0xJFHc" role="2Oq$k0">
+                              <ref role="3cqZAo" node="4U_yxogC1Ek" resolve="left" />
+                            </node>
+                            <node concept="liA8E" id="5TfjU0xJFHd" role="2OqNvi">
+                              <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3uibUv" id="5TfjU0xCks0" role="10QFUM">
+                          <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                          <node concept="16syzq" id="5TfjU0xCks1" role="11_B2D">
+                            <ref role="16sUi3" node="6MYr6Jw$T5v" resolve="TERM" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3SKdUt" id="5TfjU0xCks2" role="3cqZAp">
+                    <node concept="3SKdUq" id="5TfjU0xCks3" role="3SKWNk">
+                      <property role="3SKdUp" value="check for occurrences of the logical in the value" />
+                    </node>
+                  </node>
+                  <node concept="3cpWs8" id="5TfjU0xCks4" role="3cqZAp">
+                    <node concept="3cpWsn" id="5TfjU0xCks5" role="3cpWs9">
+                      <property role="TrG5h" value="subs" />
+                      <node concept="3uibUv" id="5TfjU0xCks6" role="1tU5fm">
+                        <ref role="3uigEE" to="yt73:~Substitution" resolve="Substitution" />
+                      </node>
+                      <node concept="2OqwBi" id="5TfjU0xCks7" role="33vP2m">
+                        <node concept="10M0yZ" id="5TfjU0xCks8" role="2Oq$k0">
+                          <ref role="1PxDUh" to="yt73:~Unification" resolve="Unification" />
+                          <ref role="3cqZAo" to="yt73:~Unification.INSTANCE" resolve="INSTANCE" />
+                        </node>
+                        <node concept="liA8E" id="5TfjU0xCks9" role="2OqNvi">
+                          <ref role="37wK5l" to="yt73:~Unification.unify(jetbrains.mps.unification.Term,jetbrains.mps.unification.Term):jetbrains.mps.unification.Substitution" resolve="unify" />
+                          <node concept="2ShNRf" id="5TfjU0xCksa" role="37wK5m">
+                            <node concept="1pGfFk" id="5TfjU0xCksb" role="2ShVmc">
+                              <ref role="37wK5l" to="oy3s:4TCblo5ML4I" resolve="LogicalDataForm" />
+                              <node concept="37vLTw" id="5TfjU0xCksc" role="37wK5m">
+                                <ref role="3cqZAo" node="5TfjU0xCkrV" resolve="termLeftRepr" />
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="10QFUN" id="5TfjU0xCksd" role="37wK5m">
+                            <node concept="16syzq" id="5TfjU0xCkse" role="10QFUM">
+                              <ref role="16sUi3" node="6MYr6Jw$T5v" resolve="TERM" />
+                            </node>
+                            <node concept="37vLTw" id="5TfjU0xCksf" role="10QFUP">
+                              <ref role="3cqZAo" node="4U_yxogC1Ei" resolve="rightVal" />
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbJ" id="5TfjU0xCksg" role="3cqZAp">
+                    <node concept="3clFbS" id="5TfjU0xCksh" role="3clFbx">
+                      <node concept="3cpWs6" id="5TfjU0xCpaR" role="3cqZAp">
+                        <node concept="3clFbT" id="5TfjU0xCpbY" role="3cqZAk" />
+                      </node>
+                    </node>
+                    <node concept="3fqX7Q" id="5TfjU0xCksx" role="3clFbw">
+                      <node concept="2OqwBi" id="5TfjU0xCksy" role="3fr31v">
+                        <node concept="37vLTw" id="5TfjU0xCksz" role="2Oq$k0">
+                          <ref role="3cqZAo" node="5TfjU0xCks5" resolve="subs" />
+                        </node>
+                        <node concept="liA8E" id="5TfjU0xCks$" role="2OqNvi">
+                          <ref role="37wK5l" to="yt73:~Substitution.isSuccessful():boolean" resolve="isSuccessful" />
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="3clFbH" id="5TfjU0xExYr" role="3cqZAp" />
+                  <node concept="1DcWWT" id="5TfjU0xHlr8" role="3cqZAp">
+                    <node concept="3clFbS" id="5TfjU0xHlr9" role="2LFqv$">
+                      <node concept="3clFbJ" id="5TfjU0xHlra" role="3cqZAp">
+                        <node concept="3clFbS" id="5TfjU0xHlrb" role="3clFbx">
+                          <node concept="3N13vt" id="5TfjU0xHlrc" role="3cqZAp" />
+                        </node>
+                        <node concept="3clFbC" id="5TfjU0xHlrj" role="3clFbw">
+                          <node concept="2OqwBi" id="5TfjU0xHlrk" role="3uHU7B">
+                            <node concept="37vLTw" id="5TfjU0xHlrl" role="2Oq$k0">
+                              <ref role="3cqZAo" node="5TfjU0xHlrK" resolve="bnd" />
+                            </node>
+                            <node concept="liA8E" id="5TfjU0xHlrm" role="2OqNvi">
+                              <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                            </node>
+                          </node>
+                          <node concept="1eOMI4" id="5TfjU0xJFHq" role="3uHU7w">
+                            <node concept="2OqwBi" id="5TfjU0xJFHn" role="1eOMHV">
+                              <node concept="37vLTw" id="5TfjU0xJFHo" role="2Oq$k0">
+                                <ref role="3cqZAo" node="4U_yxogC1Ek" resolve="left" />
+                              </node>
+                              <node concept="liA8E" id="5TfjU0xJFHp" role="2OqNvi">
+                                <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                      </node>
+                      <node concept="3clFbH" id="5TfjU0xHlro" role="3cqZAp" />
+                      <node concept="3clFbJ" id="5TfjU0xHlrp" role="3cqZAp">
+                        <node concept="3clFbS" id="5TfjU0xHlrq" role="3clFbx">
+                          <node concept="3clFbJ" id="5TfjU0xHlrr" role="3cqZAp">
+                            <node concept="3clFbS" id="5TfjU0xHlrs" role="3clFbx">
+                              <node concept="3cpWs6" id="5TfjU0xHlrt" role="3cqZAp">
+                                <node concept="3clFbT" id="5TfjU0xHlru" role="3cqZAk">
+                                  <property role="3clFbU" value="false" />
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3fqX7Q" id="5TfjU0xHlrv" role="3clFbw">
+                              <node concept="1rXfSq" id="5TfjU0xHlrw" role="3fr31v">
+                                <ref role="37wK5l" node="6xYPVrp$baS" resolve="askLogicalUni" />
+                                <node concept="2OqwBi" id="5TfjU0xHlrx" role="37wK5m">
+                                  <node concept="Xjq3P" id="5TfjU0xHlry" role="2Oq$k0" />
+                                  <node concept="liA8E" id="5TfjU0xHlrz" role="2OqNvi">
+                                    <ref role="37wK5l" node="3FIATxbQg$N" resolve="asLogicalTerm" />
+                                    <node concept="2OqwBi" id="5TfjU0xHlr$" role="37wK5m">
+                                      <node concept="37vLTw" id="5TfjU0xHlr_" role="2Oq$k0">
+                                        <ref role="3cqZAo" node="5TfjU0xHlrK" resolve="bnd" />
+                                      </node>
+                                      <node concept="liA8E" id="5TfjU0xHlrA" role="2OqNvi">
+                                        <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                                      </node>
+                                    </node>
+                                  </node>
+                                </node>
+                                <node concept="2OqwBi" id="5TfjU0xHlrB" role="37wK5m">
+                                  <node concept="37vLTw" id="5TfjU0xHlrC" role="2Oq$k0">
+                                    <ref role="3cqZAo" node="5TfjU0xHlrK" resolve="bnd" />
+                                  </node>
+                                  <node concept="liA8E" id="5TfjU0xHlrD" role="2OqNvi">
+                                    <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                          </node>
+                          <node concept="3clFbH" id="5TfjU0xHQSq" role="3cqZAp" />
+                        </node>
+                        <node concept="2OqwBi" id="5TfjU0xHlrE" role="3clFbw">
+                          <node concept="Xjq3P" id="5TfjU0xHlrF" role="2Oq$k0" />
+                          <node concept="liA8E" id="5TfjU0xHlrG" role="2OqNvi">
+                            <ref role="37wK5l" node="3FIATxbQg_7" resolve="isLogicalTerm" />
+                            <node concept="2OqwBi" id="5TfjU0xHlrH" role="37wK5m">
+                              <node concept="37vLTw" id="5TfjU0xHlrI" role="2Oq$k0">
+                                <ref role="3cqZAo" node="5TfjU0xHlrK" resolve="bnd" />
+                              </node>
+                              <node concept="liA8E" id="5TfjU0xHlrJ" role="2OqNvi">
+                                <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                              </node>
+                            </node>
+                          </node>
+                        </node>
+                        <node concept="3eNFk2" id="5TfjU0xHMGW" role="3eNLev">
+                          <node concept="3clFbS" id="5TfjU0xHMGX" role="3eOfB_">
+                            <node concept="3cpWs8" id="5TfjU0xHMGY" role="3cqZAp">
+                              <node concept="3cpWsn" id="5TfjU0xHMGZ" role="3cpWs9">
+                                <property role="TrG5h" value="bndLeft" />
+                                <node concept="3uibUv" id="5TfjU0xHMH0" role="1tU5fm">
+                                  <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                                  <node concept="3qTvmN" id="5TfjU0xHV1U" role="11_B2D" />
+                                </node>
+                                <node concept="2OqwBi" id="5TfjU0xHMH2" role="33vP2m">
+                                  <node concept="1eOMI4" id="5TfjU0xHMH3" role="2Oq$k0">
+                                    <node concept="2OqwBi" id="5TfjU0xHMH4" role="1eOMHV">
+                                      <node concept="Xjq3P" id="5TfjU0xHMH5" role="2Oq$k0" />
+                                      <node concept="liA8E" id="5TfjU0xHMH6" role="2OqNvi">
+                                        <ref role="37wK5l" node="3gNap3fZimy" resolve="asLogicalValue" />
+                                        <node concept="2OqwBi" id="5TfjU0xHMH7" role="37wK5m">
+                                          <node concept="37vLTw" id="5TfjU0xHMH8" role="2Oq$k0">
+                                            <ref role="3cqZAo" node="5TfjU0xHlrK" resolve="bnd" />
+                                          </node>
+                                          <node concept="liA8E" id="5TfjU0xHMH9" role="2OqNvi">
+                                            <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
+                                          </node>
+                                        </node>
+                                      </node>
+                                    </node>
+                                  </node>
+                                  <node concept="liA8E" id="5TfjU0xHMHa" role="2OqNvi">
+                                    <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
+                                  </node>
+                                </node>
+                              </node>
+                            </node>
+                            <node concept="3clFbJ" id="5TfjU0xHMHb" role="3cqZAp">
+                              <node concept="3clFbS" id="5TfjU0xHMHc" role="3clFbx">
+                                <node concept="3cpWs8" id="5TfjU0xHMHd" role="3cqZAp">
+                                  <node concept="3cpWsn" id="5TfjU0xHMHe" role="3cpWs9">
+                                    <property role="TrG5h" value="bndRight" />
+                                    <node concept="3uibUv" id="5TfjU0xHMHf" role="1tU5fm">
+                                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
+                                      <node concept="3qTvmN" id="5TfjU0xHMHg" role="11_B2D" />
+                                    </node>
+                                    <node concept="2OqwBi" id="5TfjU0xHMHh" role="33vP2m">
+                                      <node concept="2OqwBi" id="5TfjU0xHMHi" role="2Oq$k0">
+                                        <node concept="Xjq3P" id="5TfjU0xHMHj" role="2Oq$k0" />
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-                            <ref role="37wK5l" to="yt73:~Substitution$Binding.term():jetbrains.mps.unification.Term" resolve="term" />
+                          <node concept="liA8E" id="5TfjU0xJFHl" role="2OqNvi">
+                            <ref role="37wK5l" to="bj13:~JoinableLogical.findRoot():jetbrains.mps.logic.reactor.logical.JoinableLogical" resolve="findRoot" />
                           </node>
                         </node>
                       </node>
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-                        <ref role="37wK5l" to="yt73:~Substitution$Binding.var():jetbrains.mps.unification.Term" resolve="var" />
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+                    <node concept="37vLTw" id="5TfjU0xD3yM" role="37wK5m">
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-              <property role="3clFbU" value="true" />
-            </node>
           </node>
         </node>
+        <node concept="16euLQ" id="5TfjU0xBAXc" role="16eVyc">
+          <property role="TrG5h" value="T" />
+        </node>
         <node concept="16euLQ" id="6MYr6Jw$T5v" role="16eVyc">
           <property role="TrG5h" value="TERM" />
           <node concept="3uibUv" id="6MYr6Jw$XyJ" role="3ztrMU">
@@ -3286,43 +3522,31 @@
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="6MYr6Jwz28G" role="1tU5fm">
             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="3qTvmN" id="7BhUeN7wJYP" role="11_B2D" />
+            <node concept="16syzq" id="5TfjU0xDw1d" role="11_B2D">
+              <ref role="16sUi3" node="5TfjU0xDjwQ" resolve="T" />
+            </node>
           </node>
         </node>
         <node concept="37vLTG" id="4U_yxogC2z$" role="3clF46">
           <property role="TrG5h" value="right" />
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             <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-            <node concept="3qTvmN" id="7BhUeN7wJZF" role="11_B2D" />
+            <node concept="16syzq" id="5TfjU0xDzo5" role="11_B2D">
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           </node>
         </node>
         <node concept="10P_77" id="4U_yxogC8eN" role="3clF45" />
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           <node concept="3cpWs8" id="7d$oK1$nL7E" role="3cqZAp">
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               <property role="TrG5h" value="leftRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28M" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qTvmN" id="7BhUeN7wK1e" role="11_B2D" />
+                <node concept="16syzq" id="5TfjU0xH76F" role="11_B2D">
+                  <ref role="16sUi3" node="5TfjU0xDjwQ" resolve="T" />
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               </node>
               <node concept="2OqwBi" id="7d$oK1$nL7H" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$nL7I" role="2Oq$k0">
@@ -3339,7 +3563,9 @@
               <property role="TrG5h" value="rightRepr" />
               <node concept="3uibUv" id="6MYr6Jwz28P" role="1tU5fm">
                 <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                <node concept="3qTvmN" id="7BhUeN7wK22" role="11_B2D" />
+                <node concept="16syzq" id="5TfjU0xHaCr" role="11_B2D">
+                  <ref role="16sUi3" node="5TfjU0xDjwQ" resolve="T" />
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               </node>
               <node concept="2OqwBi" id="7d$oK1$nLDP" role="33vP2m">
                 <node concept="37vLTw" id="7d$oK1$nLDQ" role="2Oq$k0">
@@ -3351,7 +3577,6 @@
               </node>
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@@ -3369,381 +3594,120 @@
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+                <node concept="liA8E" id="5TfjU0xF2Pc" role="2OqNvi">
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+              <node concept="liA8E" id="5TfjU0xGAre" role="2OqNvi">
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+            <node concept="3SKdUq" id="5TfjU0xI2F$" role="3SKWNk">
+              <property role="3SKdUp" value="both variables are free" />
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+          </node>
           <node concept="3cpWs6" id="3HJTsBn3F6H" role="3cqZAp">
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+          <property role="TrG5h" value="T" />
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@@ -3789,7 +3753,7 @@
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+                  <ref role="37wK5l" node="4U_yxogC1Eh" resolve="askUni_logical_val" />
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@@ -3870,6 +3834,7 @@
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               <node concept="3clFbS" id="2T1p0CFz6aU" role="9aQI4">
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@@ -5093,7 +5058,7 @@
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-              <ref role="37wK5l" node="2UGjFq4lB$H" resolve="_ask" />
+              <ref role="37wK5l" node="2UGjFq4lB$H" resolve="doAsk" />
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@@ -5132,7 +5097,7 @@
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       <node concept="3clFb_" id="2UGjFq4lB$H" role="jymVt">
-        <property role="TrG5h" value="_ask" />
+        <property role="TrG5h" value="doAsk" />
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@@ -5152,7 +5117,7 @@
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-                  <ref role="37wK5l" node="3HJTsBn4VAS" resolve="_askEq_var_var" />
+                  <ref role="37wK5l" node="3HJTsBn4VAS" resolve="askEq_logical_logical" />
                   <node concept="10QFUN" id="2UGjFq4lBz1" role="37wK5m">
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@@ -5201,7 +5166,7 @@
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-                    <ref role="37wK5l" node="3HJTsBn4VAB" resolve="_askEq_var_val" />
+                    <ref role="37wK5l" node="3HJTsBn4VAB" resolve="askEq_logical_val" />
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                       <node concept="37vLTw" id="2UGjFq4lB$C" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lB$n" resolve="left" />
@@ -5252,7 +5217,7 @@
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                   <node concept="1rXfSq" id="2UGjFq4lBzD" role="3cqZAk">
-                    <ref role="37wK5l" node="3HJTsBn4VAm" resolve="_askEq_val_var" />
+                    <ref role="37wK5l" node="3HJTsBn4VAm" resolve="askEq_val_logical" />
                     <node concept="10QFUN" id="2UGjFq4lBzE" role="37wK5m">
                       <node concept="16syzq" id="2UGjFq4lBzF" role="10QFUM">
                         <ref role="16sUi3" node="2UGjFq4mCKS" resolve="T" />
@@ -5303,7 +5268,7 @@
               <node concept="3clFbS" id="2UGjFq4lBzW" role="3eOfB_">
                 <node concept="3cpWs6" id="2UGjFq4lBzX" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lBzY" role="3cqZAk">
-                    <ref role="37wK5l" node="3HJTsBn4VA6" resolve="_askEq_val_val" />
+                    <ref role="37wK5l" node="3HJTsBn4VA6" resolve="askEq_val_val" />
                     <node concept="10QFUN" id="2UGjFq4lBzZ" role="37wK5m">
                       <node concept="16syzq" id="2UGjFq4lB$0" role="10QFUM">
                         <ref role="16sUi3" node="2UGjFq4mCKS" resolve="T" />
@@ -5386,7 +5351,7 @@
         <node concept="3clFbS" id="2UGjFq4lKkp" role="3clF47">
           <node concept="3clFbF" id="2UGjFq4lNPr" role="3cqZAp">
             <node concept="1rXfSq" id="2UGjFq4lNPt" role="3clFbG">
-              <ref role="37wK5l" node="2UGjFq4lGBW" resolve="_tell" />
+              <ref role="37wK5l" node="2UGjFq4lGBW" resolve="doTell" />
               <node concept="2OqwBi" id="2UGjFq4lNPu" role="37wK5m">
                 <node concept="2OqwBi" id="2UGjFq4lNPv" role="2Oq$k0">
                   <node concept="37vLTw" id="2UGjFq4lNPw" role="2Oq$k0">
@@ -5428,7 +5393,7 @@
       </node>
       <node concept="2tJIrI" id="2UGjFq4lJKz" role="jymVt" />
       <node concept="3clFb_" id="2UGjFq4lGBW" role="jymVt">
-        <property role="TrG5h" value="_tell" />
+        <property role="TrG5h" value="doTell" />
         <node concept="3Tmbuc" id="2UGjFq4lJig" role="1B3o_S" />
         <node concept="3cqZAl" id="2UGjFq4lGBY" role="3clF45" />
         <node concept="37vLTG" id="2UGjFq4lGBA" role="3clF46">
@@ -5448,7 +5413,7 @@
             <node concept="3clFbS" id="2UGjFq4lGAc" role="3clFbx">
               <node concept="3clFbF" id="2UGjFq4lGAd" role="3cqZAp">
                 <node concept="1rXfSq" id="2UGjFq4lGAe" role="3clFbG">
-                  <ref role="37wK5l" node="3HJTsBn4V_Q" resolve="_tellEq_var_var" />
+                  <ref role="37wK5l" node="3HJTsBn4V_Q" resolve="tellEq_logical_logical" />
                   <node concept="10QFUN" id="2UGjFq4lGAf" role="37wK5m">
                     <node concept="37vLTw" id="2UGjFq4lGBJ" role="10QFUP">
                       <ref role="3cqZAo" node="2UGjFq4lGBA" resolve="left" />
@@ -5497,7 +5462,7 @@
               <node concept="3clFbS" id="2UGjFq4lGAw" role="3eOfB_">
                 <node concept="3clFbF" id="2UGjFq4lGAx" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lGAy" role="3clFbG">
-                    <ref role="37wK5l" node="3HJTsBn4V_B" resolve="_tellEq_var_val" />
+                    <ref role="37wK5l" node="3HJTsBn4V_B" resolve="tellEq_logical_val" />
                     <node concept="10QFUN" id="2UGjFq4lGAz" role="37wK5m">
                       <node concept="37vLTw" id="2UGjFq4lGBR" role="10QFUP">
                         <ref role="3cqZAo" node="2UGjFq4lGBA" resolve="left" />
@@ -5548,7 +5513,7 @@
               <node concept="3clFbS" id="2UGjFq4lGAP" role="3eOfB_">
                 <node concept="3clFbF" id="2UGjFq4lGAQ" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lGAR" role="3clFbG">
-                    <ref role="37wK5l" node="3HJTsBn4V_o" resolve="_tellEq_val_var" />
+                    <ref role="37wK5l" node="3HJTsBn4V_o" resolve="tellEq_val_logical" />
                     <node concept="10QFUN" id="2UGjFq4lGAS" role="37wK5m">
                       <node concept="16syzq" id="2UGjFq4lGAT" role="10QFUM">
                         <ref role="16sUi3" node="2UGjFq4lHLA" resolve="T" />
@@ -5595,16 +5560,11 @@
                 </node>
               </node>
             </node>
-            <node concept="3eNFk2" id="2UGjFq4lGB9" role="3eNLev">
-              <node concept="3clFbS" id="2UGjFq4lGBa" role="3eOfB_">
-                <node concept="3SKdUt" id="2UGjFq4lGBb" role="3cqZAp">
-                  <node concept="3SKdUq" id="2UGjFq4lGBc" role="3SKWNk">
-                    <property role="3SKdUp" value="todo: unreachable code" />
-                  </node>
-                </node>
+            <node concept="9aQIb" id="2UGjFq4lGBw" role="9aQIa">
+              <node concept="3clFbS" id="2UGjFq4lGBx" role="9aQI4">
                 <node concept="3clFbF" id="2UGjFq4lGBd" role="3cqZAp">
                   <node concept="1rXfSq" id="2UGjFq4lGBe" role="3clFbG">
-                    <ref role="37wK5l" node="3HJTsBn4V_a" resolve="_tellEq_val_val" />
+                    <ref role="37wK5l" node="3HJTsBn4V_a" resolve="tellEq_val_val" />
                     <node concept="10QFUN" id="2UGjFq4lGBf" role="37wK5m">
                       <node concept="16syzq" id="2UGjFq4lGBg" role="10QFUM">
                         <ref role="16sUi3" node="2UGjFq4lHLA" resolve="T" />
@@ -5623,45 +5583,6 @@
                     </node>
                   </node>
                 </node>
-                <node concept="3clFbH" id="2UGjFq4lGBl" role="3cqZAp" />
-              </node>
-              <node concept="1Wc70l" id="2UGjFq4lGBm" role="3eO9$A">
-                <node concept="1eOMI4" id="2UGjFq4lGBn" role="3uHU7B">
-                  <node concept="2ZW3vV" id="2UGjFq4lGBo" role="1eOMHV">
-                    <node concept="3uibUv" id="5cDlfXt5PNh" role="2ZW6by">
-                      <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                    </node>
-                    <node concept="37vLTw" id="2UGjFq4lGBI" role="2ZW6bz">
-                      <ref role="3cqZAo" node="2UGjFq4lGBA" resolve="left" />
-                    </node>
-                  </node>
-                </node>
-                <node concept="3fqX7Q" id="2UGjFq4lGBr" role="3uHU7w">
-                  <node concept="1eOMI4" id="2UGjFq4lGBs" role="3fr31v">
-                    <node concept="2ZW3vV" id="2UGjFq4lGBt" role="1eOMHV">
-                      <node concept="3uibUv" id="5cDlfXt5PPf" role="2ZW6by">
-                        <ref role="3uigEE" to="bj13:~JoinableLogical" resolve="JoinableLogical" />
-                      </node>
-                      <node concept="37vLTw" id="2UGjFq4lGBQ" role="2ZW6bz">
-                        <ref role="3cqZAo" node="2UGjFq4lGBC" resolve="right" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
-              </node>
-            </node>
-            <node concept="9aQIb" id="2UGjFq4lGBw" role="9aQIa">
-              <node concept="3clFbS" id="2UGjFq4lGBx" role="9aQI4">
-                <node concept="YS8fn" id="2UGjFq4lGBy" role="3cqZAp">
-                  <node concept="2ShNRf" id="2UGjFq4lGBz" role="YScLw">
-                    <node concept="1pGfFk" id="2UGjFq4lGB$" role="2ShVmc">
-                      <ref role="37wK5l" to="wyt6:~IllegalArgumentException.&lt;init&gt;(java.lang.String)" resolve="IllegalArgumentException" />
-                      <node concept="Xl_RD" id="2UGjFq4lGB_" role="37wK5m">
-                        <property role="Xl_RC" value="invalid arguments" />
-                      </node>
-                    </node>
-                  </node>
-                </node>
               </node>
             </node>
           </node>
@@ -5673,7 +5594,7 @@
       <node concept="2tJIrI" id="6MYr6JwR0ld" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4V_a" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellEq_val_val" />
+        <property role="TrG5h" value="tellEq_val_val" />
         <node concept="37vLTG" id="3HJTsBn4V_b" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwQ3A$" role="1tU5fm">
@@ -5765,7 +5686,7 @@
       <node concept="2tJIrI" id="3HJTsBn4X9i" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4V_o" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellEq_val_var" />
+        <property role="TrG5h" value="tellEq_val_logical" />
         <node concept="37vLTG" id="3HJTsBn4V_p" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwQ64U" role="1tU5fm">
@@ -5786,7 +5707,7 @@
         <node concept="3clFbS" id="3HJTsBn4V_A" role="3clF47">
           <node concept="3clFbF" id="3HJTsBn7fYl" role="3cqZAp">
             <node concept="1rXfSq" id="3HJTsBn7fYk" role="3clFbG">
-              <ref role="37wK5l" node="3HJTsBn4V_B" resolve="_tellEq_var_val" />
+              <ref role="37wK5l" node="3HJTsBn4V_B" resolve="tellEq_logical_val" />
               <node concept="37vLTw" id="3HJTsBn7g__" role="37wK5m">
                 <ref role="3cqZAo" node="3HJTsBn4V_r" resolve="right" />
               </node>
@@ -5803,7 +5724,7 @@
       <node concept="2tJIrI" id="3HJTsBn4XRl" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4V_B" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellEq_var_val" />
+        <property role="TrG5h" value="tellEq_logical_val" />
         <node concept="37vLTG" id="3HJTsBn4V_C" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="3HJTsBn4V_D" role="1tU5fm">
@@ -5902,7 +5823,7 @@
               <node concept="3clFbS" id="3HJTsBn77ZJ" role="9aQI4">
                 <node concept="3clFbF" id="3HJTsBn77ZK" role="3cqZAp">
                   <node concept="1rXfSq" id="3HJTsBn77ZL" role="3clFbG">
-                    <ref role="37wK5l" node="3HJTsBn4V_a" resolve="_tellEq_val_val" />
+                    <ref role="37wK5l" node="3HJTsBn4V_a" resolve="tellEq_val_val" />
                     <node concept="37vLTw" id="3HJTsBn77ZM" role="37wK5m">
                       <ref role="3cqZAo" node="3HJTsBn77Zj" resolve="leftVal" />
                     </node>
@@ -5922,7 +5843,7 @@
       <node concept="2tJIrI" id="3HJTsBn5gqM" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4V_Q" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_tellEq_var_var" />
+        <property role="TrG5h" value="tellEq_logical_logical" />
         <node concept="37vLTG" id="3HJTsBn4V_R" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="3HJTsBn4V_S" role="1tU5fm">
@@ -6024,7 +5945,7 @@
             <node concept="3clFbS" id="5TfjU0xlHoQ" role="3clFbx">
               <node concept="3clFbF" id="5TfjU0xlJ7H" role="3cqZAp">
                 <node concept="1rXfSq" id="5TfjU0xlJ7F" role="3clFbG">
-                  <ref role="37wK5l" node="3HJTsBn4V_a" resolve="_tellEq_val_val" />
+                  <ref role="37wK5l" node="3HJTsBn4V_a" resolve="tellEq_val_val" />
                   <node concept="2OqwBi" id="5TfjU0xlJoT" role="37wK5m">
                     <node concept="37vLTw" id="5TfjU0xlJj3" role="2Oq$k0">
                       <ref role="3cqZAo" node="3HJTsBn6R7x" resolve="leftRepr" />
@@ -6103,7 +6024,7 @@
       <node concept="2tJIrI" id="6MYr6JwR1xu" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4VA6" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askEq_val_val" />
+        <property role="TrG5h" value="askEq_val_val" />
         <node concept="37vLTG" id="3HJTsBn4VA7" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwQALa" role="1tU5fm">
@@ -6154,7 +6075,7 @@
       <node concept="2tJIrI" id="3HJTsBn6LBY" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4VAm" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askEq_val_var" />
+        <property role="TrG5h" value="askEq_val_logical" />
         <node concept="37vLTG" id="3HJTsBn4VAn" role="3clF46">
           <property role="TrG5h" value="leftVal" />
           <node concept="16syzq" id="6MYr6JwQE6u" role="1tU5fm">
@@ -6175,7 +6096,7 @@
         <node concept="3clFbS" id="3HJTsBn4VA$" role="3clF47">
           <node concept="3clFbF" id="3HJTsBn6Ihr" role="3cqZAp">
             <node concept="1rXfSq" id="3HJTsBn6Ihp" role="3clFbG">
-              <ref role="37wK5l" node="3HJTsBn4VAB" resolve="_askEq_var_val" />
+              <ref role="37wK5l" node="3HJTsBn4VAB" resolve="askEq_logical_val" />
               <node concept="37vLTw" id="3HJTsBn6IDu" role="37wK5m">
                 <ref role="3cqZAo" node="3HJTsBn4VAp" resolve="right" />
               </node>
@@ -6192,7 +6113,7 @@
       <node concept="2tJIrI" id="3HJTsBn4ZY2" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4VAB" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askEq_var_val" />
+        <property role="TrG5h" value="askEq_logical_val" />
         <node concept="37vLTG" id="3HJTsBn4VAC" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="3HJTsBn4VAD" role="1tU5fm">
@@ -6257,7 +6178,7 @@
           <node concept="3clFbH" id="3HJTsBn6Hcd" role="3cqZAp" />
           <node concept="3cpWs6" id="5TfjU0xlUWE" role="3cqZAp">
             <node concept="1rXfSq" id="5TfjU0xlWcq" role="3cqZAk">
-              <ref role="37wK5l" node="3HJTsBn4VA6" resolve="_askEq_val_val" />
+              <ref role="37wK5l" node="3HJTsBn4VA6" resolve="askEq_val_val" />
               <node concept="2OqwBi" id="5TfjU0xlXxj" role="37wK5m">
                 <node concept="37vLTw" id="5TfjU0xlWPe" role="2Oq$k0">
                   <ref role="3cqZAo" node="3HJTsBn6Ehk" resolve="leftRepr" />
@@ -6279,7 +6200,7 @@
       <node concept="2tJIrI" id="3HJTsBn51oT" role="jymVt" />
       <node concept="3clFb_" id="3HJTsBn4VAS" role="jymVt">
         <property role="1EzhhJ" value="false" />
-        <property role="TrG5h" value="_askEq_var_var" />
+        <property role="TrG5h" value="askEq_logical_logical" />
         <node concept="37vLTG" id="3HJTsBn4VAT" role="3clF46">
           <property role="TrG5h" value="left" />
           <node concept="3uibUv" id="3HJTsBn4VAU" role="1tU5fm">
@@ -6384,7 +6305,7 @@
             <node concept="3clFbS" id="5TfjU0xm2Zg" role="3clFbx">
               <node concept="3cpWs6" id="5TfjU0xm7jI" role="3cqZAp">
                 <node concept="1rXfSq" id="5TfjU0xm84k" role="3cqZAk">
-                  <ref role="37wK5l" node="3HJTsBn4VA6" resolve="_askEq_val_val" />
+                  <ref role="37wK5l" node="3HJTsBn4VA6" resolve="askEq_val_val" />
                   <node concept="2OqwBi" id="5TfjU0xm9D1" role="37wK5m">
                     <node concept="37vLTw" id="5TfjU0xm8P2" role="2Oq$k0">
                       <ref role="3cqZAo" node="3HJTsBn61Rr" resolve="leftRepr" />
diff --git a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
index 177b31bc..07fd2012 100644
--- a/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
+++ b/coderules/solutions/jetbrains.mps.logic.test/models/jetbrains/mps/logic/test/unification.mps
@@ -787,7 +787,7 @@
       <node concept="3clFbS" id="6N2bvv_uxfx" role="3clF47">
         <node concept="3clFbF" id="6N2bvv_uxi6" role="3cqZAp">
           <node concept="1rXfSq" id="6N2bvv_uxi5" role="3clFbG">
-            <ref role="37wK5l" to="cxk7:2UGjFq4lB$H" resolve="_ask" />
+            <ref role="37wK5l" to="cxk7:2UGjFq4lB$H" resolve="doAsk" />
             <node concept="37vLTw" id="6N2bvv_uxmD" role="37wK5m">
               <ref role="3cqZAo" node="6N2bvv_uxfQ" resolve="a" />
             </node>
@@ -818,7 +818,7 @@
       <node concept="3clFbS" id="6yEjedm8tAm" role="3clF47">
         <node concept="3clFbF" id="6yEjedm8tOR" role="3cqZAp">
           <node concept="1rXfSq" id="6yEjedm8tOQ" role="3clFbG">
-            <ref role="37wK5l" to="cxk7:2UGjFq4lGBW" resolve="_tell" />
+            <ref role="37wK5l" to="cxk7:2UGjFq4lGBW" resolve="doTell" />
             <node concept="37vLTw" id="6yEjedm8tTM" role="37wK5m">
               <ref role="3cqZAo" node="6yEjedm8tDF" resolve="a" />
             </node>