diff --git a/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/models/test.com.mbeddr.mpsutil.logicalChild.test@tests.mps b/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/models/test.com.mbeddr.mpsutil.logicalChild.test@tests.mps
index 1153a0f187..818ff6730a 100644
--- a/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/models/test.com.mbeddr.mpsutil.logicalChild.test@tests.mps
+++ b/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/models/test.com.mbeddr.mpsutil.logicalChild.test@tests.mps
@@ -4,19 +4,26 @@
   <languages>
     <use id="8585453e-6bfb-4d80-98de-b16074f1d86c" name="jetbrains.mps.lang.test" version="6" />
     <use id="f61473f9-130f-42f6-b98d-6c438812c2f6" name="jetbrains.mps.baseLanguage.unitTest" version="1" />
-    <use id="286e2375-00e3-4042-b083-84873dd623be" name="com.mbeddr.mpsutil.logicalChild.sandbox" version="0" />
     <use id="7866978e-a0f0-4cc7-81bc-4d213d9375e1" name="jetbrains.mps.lang.smodel" version="19" />
     <use id="3a13115c-633c-4c5c-bbcc-75c4219e9555" name="jetbrains.mps.lang.quotation" version="5" />
     <use id="c7fb639f-be78-4307-89b0-b5959c3fa8c8" name="jetbrains.mps.lang.text" version="0" />
+    <use id="63650c59-16c8-498a-99c8-005c7ee9515d" name="jetbrains.mps.lang.access" version="0" />
+    <use id="f3061a53-9226-4cc5-a443-f952ceaf5816" name="jetbrains.mps.baseLanguage" version="12" />
+    <use id="fd392034-7849-419d-9071-12563d152375" name="jetbrains.mps.baseLanguage.closures" version="0" />
+    <use id="83888646-71ce-4f1c-9c53-c54016f6ad4f" name="jetbrains.mps.baseLanguage.collections" version="1" />
+    <use id="446c26eb-2b7b-4bf0-9b35-f83fa582753e" name="jetbrains.mps.lang.modelapi" version="0" />
   </languages>
   <imports>
     <import index="n7tw" ref="r:e9fcc9c2-114c-4ba2-897c-9e44451eea40(com.mbeddr.mpsutil.logicalChild.behavior)" />
     <import index="i5cy" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util.concurrent.atomic(JDK/)" />
     <import index="5zyv" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util.concurrent(JDK/)" />
-    <import index="z1c3" ref="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea/java:jetbrains.mps.project(MPS.Core/)" implicit="true" />
-    <import index="xxir" ref="r:a615bfc0-ceb2-486e-85b1-8debbfdfdbb6(com.mbeddr.mpsutil.logicalChild.structure)" implicit="true" />
-    <import index="wyt6" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.lang(JDK/)" implicit="true" />
-    <import index="legp" ref="r:e06fc7a9-6c1d-4d1e-abb5-eda20a08c26c(com.mbeddr.mpsutil.logicalChild.sandbox.structure)" implicit="true" />
+    <import index="1ctc" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.util.stream(JDK/)" />
+    <import index="guwi" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.io(JDK/)" />
+    <import index="z1c3" ref="6ed54515-acc8-4d1e-a16c-9fd6cfe951ea/java:jetbrains.mps.project(MPS.Core/)" />
+    <import index="legp" ref="r:e06fc7a9-6c1d-4d1e-abb5-eda20a08c26c(com.mbeddr.mpsutil.logicalChild.sandbox.structure)" />
+    <import index="xxir" ref="r:a615bfc0-ceb2-486e-85b1-8debbfdfdbb6(com.mbeddr.mpsutil.logicalChild.structure)" />
+    <import index="wyt6" ref="6354ebe7-c22a-4a0f-ac54-50b52ab9b065/java:java.lang(JDK/)" />
+    <import index="lui2" ref="8865b7a8-5271-43d3-884c-6fd1d9cfdd34/java:org.jetbrains.mps.openapi.module(MPS.OpenAPI/)" />
   </imports>
   <registry>
     <language id="8585453e-6bfb-4d80-98de-b16074f1d86c" name="jetbrains.mps.lang.test">
@@ -35,11 +42,18 @@
         <child id="1068498886297" name="rValue" index="37vLTx" />
         <child id="1068498886295" name="lValue" index="37vLTJ" />
       </concept>
+      <concept id="1215695189714" name="jetbrains.mps.baseLanguage.structure.PlusAssignmentExpression" flags="nn" index="d57v9" />
       <concept id="4836112446988635817" name="jetbrains.mps.baseLanguage.structure.UndefinedType" flags="in" index="2jxLKc" />
       <concept id="1202948039474" name="jetbrains.mps.baseLanguage.structure.InstanceMethodCallOperation" flags="nn" index="liA8E" />
       <concept id="8118189177080264853" name="jetbrains.mps.baseLanguage.structure.AlternativeType" flags="ig" index="nSUau">
         <child id="8118189177080264854" name="alternative" index="nSUat" />
       </concept>
+      <concept id="1239714755177" name="jetbrains.mps.baseLanguage.structure.AbstractUnaryNumberOperation" flags="nn" index="2$Kvd9">
+        <child id="1239714902950" name="expression" index="2$L3a6" />
+      </concept>
+      <concept id="1154032098014" name="jetbrains.mps.baseLanguage.structure.AbstractLoopStatement" flags="nn" index="2LF5Ji">
+        <child id="1154032183016" name="body" index="2LFqv$" />
+      </concept>
       <concept id="1197027756228" name="jetbrains.mps.baseLanguage.structure.DotExpression" flags="nn" index="2OqwBi">
         <child id="1197027771414" name="operand" index="2Oq$k0" />
         <child id="1197027833540" name="operation" index="2OqNvi" />
@@ -61,18 +75,29 @@
       <concept id="1164991038168" name="jetbrains.mps.baseLanguage.structure.ThrowStatement" flags="nn" index="YS8fn">
         <child id="1164991057263" name="throwable" index="YScLw" />
       </concept>
+      <concept id="1070533707846" name="jetbrains.mps.baseLanguage.structure.StaticFieldReference" flags="nn" index="10M0yZ">
+        <reference id="1144433057691" name="classifier" index="1PxDUh" />
+      </concept>
       <concept id="1070534058343" name="jetbrains.mps.baseLanguage.structure.NullLiteral" flags="nn" index="10Nm6u" />
+      <concept id="1070534370425" name="jetbrains.mps.baseLanguage.structure.IntegerType" flags="in" index="10Oyi0" />
       <concept id="1070534644030" name="jetbrains.mps.baseLanguage.structure.BooleanType" flags="in" index="10P_77" />
+      <concept id="1070534934090" name="jetbrains.mps.baseLanguage.structure.CastExpression" flags="nn" index="10QFUN">
+        <child id="1070534934091" name="type" index="10QFUM" />
+        <child id="1070534934092" name="expression" index="10QFUP" />
+      </concept>
       <concept id="1068431474542" name="jetbrains.mps.baseLanguage.structure.VariableDeclaration" flags="ng" index="33uBYm">
+        <property id="1176718929932" name="isFinal" index="3TUv4t" />
         <child id="1068431790190" name="initializer" index="33vP2m" />
       </concept>
       <concept id="1513279640923991009" name="jetbrains.mps.baseLanguage.structure.IGenericClassCreator" flags="ng" index="366HgL">
         <property id="1513279640906337053" name="inferTypeParams" index="373rjd" />
       </concept>
+      <concept id="1092119917967" name="jetbrains.mps.baseLanguage.structure.MulExpression" flags="nn" index="17qRlL" />
       <concept id="1068498886296" name="jetbrains.mps.baseLanguage.structure.VariableReference" flags="nn" index="37vLTw">
         <reference id="1068581517664" name="variableDeclaration" index="3cqZAo" />
       </concept>
       <concept id="1068498886294" name="jetbrains.mps.baseLanguage.structure.AssignmentExpression" flags="nn" index="37vLTI" />
+      <concept id="1225271177708" name="jetbrains.mps.baseLanguage.structure.StringType" flags="in" index="17QB3L" />
       <concept id="4972933694980447171" name="jetbrains.mps.baseLanguage.structure.BaseVariableDeclaration" flags="ng" index="19Szcq">
         <child id="5680397130376446158" name="type" index="1tU5fm" />
       </concept>
@@ -103,8 +128,12 @@
       <concept id="1068581242864" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclarationStatement" flags="nn" index="3cpWs8">
         <child id="1068581242865" name="localVariableDeclaration" index="3cpWs9" />
       </concept>
+      <concept id="1068581242867" name="jetbrains.mps.baseLanguage.structure.LongType" flags="in" index="3cpWsb" />
       <concept id="1068581242863" name="jetbrains.mps.baseLanguage.structure.LocalVariableDeclaration" flags="nr" index="3cpWsn" />
       <concept id="1068581517677" name="jetbrains.mps.baseLanguage.structure.VoidType" flags="in" index="3cqZAl" />
+      <concept id="1079359253375" name="jetbrains.mps.baseLanguage.structure.ParenthesizedExpression" flags="nn" index="1eOMI4">
+        <child id="1079359253376" name="expression" index="1eOMHV" />
+      </concept>
       <concept id="1160998861373" name="jetbrains.mps.baseLanguage.structure.AssertStatement" flags="nn" index="1gVbGN">
         <child id="1160998896846" name="condition" index="1gVkn0" />
       </concept>
@@ -121,6 +150,7 @@
         <child id="1081773367579" name="rightExpression" index="3uHU7w" />
         <child id="1081773367580" name="leftExpression" index="3uHU7B" />
       </concept>
+      <concept id="1214918800624" name="jetbrains.mps.baseLanguage.structure.PostfixIncrementExpression" flags="nn" index="3uNrnE" />
       <concept id="3093926081414150598" name="jetbrains.mps.baseLanguage.structure.MultipleCatchClause" flags="ng" index="3uVAMA">
         <child id="8276990574895933173" name="catchBody" index="1zc67A" />
         <child id="8276990574895933172" name="throwable" index="1zc67B" />
@@ -138,6 +168,15 @@
         <child id="8356039341262087992" name="line" index="1aUNEU" />
       </concept>
     </language>
+    <language id="63650c59-16c8-498a-99c8-005c7ee9515d" name="jetbrains.mps.lang.access">
+      <concept id="8974276187400348173" name="jetbrains.mps.lang.access.structure.CommandClosureLiteral" flags="nn" index="1QHqEC" />
+      <concept id="8974276187400348170" name="jetbrains.mps.lang.access.structure.BaseExecuteCommandStatement" flags="nn" index="1QHqEJ">
+        <child id="1423104411234567454" name="repo" index="ukAjM" />
+        <child id="8974276187400348171" name="commandClosureLiteral" index="1QHqEI" />
+      </concept>
+      <concept id="8974276187400348181" name="jetbrains.mps.lang.access.structure.ExecuteLightweightCommandStatement" flags="nn" index="1QHqEK" />
+      <concept id="8974276187400348179" name="jetbrains.mps.lang.access.structure.ExecuteEDTCommandStatement" flags="nn" index="1QHqEQ" />
+    </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" />
@@ -181,6 +220,7 @@
       <concept id="1171983834376" name="jetbrains.mps.baseLanguage.unitTest.structure.AssertFalse" flags="nn" index="3vFxKo">
         <child id="1171983854940" name="condition" index="3vFALc" />
       </concept>
+      <concept id="1172017222794" name="jetbrains.mps.baseLanguage.unitTest.structure.Fail" flags="nn" index="3xETmq" />
       <concept id="1172073500303" name="jetbrains.mps.baseLanguage.unitTest.structure.Message" flags="ng" index="3_1$Yv">
         <child id="1172073511101" name="message" index="3_1BAH" />
       </concept>
@@ -247,7 +287,20 @@
         <child id="1151688676805" name="elementType" index="_ZDj9" />
       </concept>
       <concept id="1151702311717" name="jetbrains.mps.baseLanguage.collections.structure.ToListOperation" flags="nn" index="ANE8D" />
+      <concept id="1153943597977" name="jetbrains.mps.baseLanguage.collections.structure.ForEachStatement" flags="nn" index="2Gpval">
+        <child id="1153944400369" name="variable" index="2Gsz3X" />
+        <child id="1153944424730" name="inputSequence" index="2GsD0m" />
+      </concept>
+      <concept id="1153944193378" name="jetbrains.mps.baseLanguage.collections.structure.ForEachVariable" flags="nr" index="2GrKxI" />
+      <concept id="1153944233411" name="jetbrains.mps.baseLanguage.collections.structure.ForEachVariableReference" flags="nn" index="2GrUjf">
+        <reference id="1153944258490" name="variable" index="2Gs0qQ" />
+      </concept>
+      <concept id="1237721394592" name="jetbrains.mps.baseLanguage.collections.structure.AbstractContainerCreator" flags="nn" index="HWqM0">
+        <child id="1237721435807" name="elementType" index="HW$YZ" />
+      </concept>
       <concept id="1203518072036" name="jetbrains.mps.baseLanguage.collections.structure.SmartClosureParameterDeclaration" flags="ig" index="Rh6nW" />
+      <concept id="1160600644654" name="jetbrains.mps.baseLanguage.collections.structure.ListCreatorWithInit" flags="nn" index="Tc6Ow" />
+      <concept id="1160612413312" name="jetbrains.mps.baseLanguage.collections.structure.AddElementOperation" flags="nn" index="TSZUe" />
       <concept id="1162934736510" name="jetbrains.mps.baseLanguage.collections.structure.GetElementOperation" flags="nn" index="34jXtK" />
       <concept id="1162935959151" name="jetbrains.mps.baseLanguage.collections.structure.GetSizeOperation" flags="nn" index="34oBXx" />
     </language>
@@ -972,5 +1025,593 @@
   <node concept="2XOHcx" id="4Ijegxhuddk">
     <property role="2XOHcw" value="${mbeddr.github.core.home}/code/languages/com.mbeddr.mpsutil" />
   </node>
+  <node concept="1lH9Xt" id="79TFkryAZn8">
+    <property role="3DII0k" value="2hh8MJdVwqT/none" />
+    <property role="TrG5h" value="ILogicalChildResolvingMultipleThreads" />
+    <node concept="1LZb2c" id="79TFkryAZsg" role="1SL9yI">
+      <property role="TrG5h" value="multipleThreads" />
+      <node concept="3cqZAl" id="79TFkryAZsh" role="3clF45" />
+      <node concept="3clFbS" id="79TFkryAZsi" role="3clF47">
+        <node concept="3cpWs8" id="79TFkryAZsj" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZsk" role="3cpWs9">
+            <property role="TrG5h" value="exampleModel" />
+            <node concept="1XwpNF" id="79TFkryAZsl" role="1tU5fm" />
+            <node concept="1Xw6AR" id="79TFkryAZsm" role="33vP2m">
+              <node concept="1dCxOl" id="79TFkryAZsn" role="1XwpL7">
+                <property role="1XweGQ" value="r:ced7d7b2-46d1-452d-9f1f-a15fe0e7ebee" />
+                <node concept="1j_P7g" id="79TFkryAZso" role="1j$8Uc">
+                  <property role="1j_P7h" value="com.mbeddr.mpsutil.logicalChild.sandbox.sandbox.example" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="79TFkryAZsp" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZsq" role="3cpWs9">
+            <property role="TrG5h" value="repository" />
+            <node concept="3uibUv" id="79TFkryAZsr" role="1tU5fm">
+              <ref role="3uigEE" to="lui2:~SRepository" resolve="SRepository" />
+            </node>
+            <node concept="2OqwBi" id="79TFkryAZss" role="33vP2m">
+              <node concept="1jxXqW" id="79TFkryAZst" role="2Oq$k0" />
+              <node concept="liA8E" id="79TFkryAZsu" role="2OqNvi">
+                <ref role="37wK5l" to="z1c3:~Project.getRepository()" resolve="getRepository" />
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryAZsv" role="3cqZAp" />
+        <node concept="3cpWs8" id="79TFkryAZsw" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZsx" role="3cpWs9">
+            <property role="TrG5h" value="modell" />
+            <node concept="H_c77" id="79TFkryAZsy" role="1tU5fm" />
+            <node concept="2OqwBi" id="79TFkryAZsz" role="33vP2m">
+              <node concept="37vLTw" id="79TFkryAZs$" role="2Oq$k0">
+                <ref role="3cqZAo" node="79TFkryAZsk" resolve="exampleModel" />
+              </node>
+              <node concept="2yCiCJ" id="79TFkryAZs_" role="2OqNvi">
+                <node concept="37vLTw" id="79TFkryAZsA" role="Vysub">
+                  <ref role="3cqZAo" node="79TFkryAZsq" resolve="repository" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="79TFkryAZsB" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZsC" role="3cpWs9">
+            <property role="TrG5h" value="ilcos" />
+            <node concept="2I9FWS" id="79TFkryAZsD" role="1tU5fm">
+              <ref role="2I9WkF" to="xxir:jksL7exwyH" resolve="ILogicalChildOwner" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryAZsE" role="3cqZAp" />
+        <node concept="1QHqEK" id="79TFkryAZsF" role="3cqZAp">
+          <node concept="1QHqEC" id="79TFkryAZsG" role="1QHqEI">
+            <node concept="3clFbS" id="79TFkryAZsH" role="1bW5cS">
+              <node concept="3clFbF" id="79TFkryAZsI" role="3cqZAp">
+                <node concept="37vLTI" id="79TFkryAZsJ" role="3clFbG">
+                  <node concept="2OqwBi" id="79TFkryAZsK" role="37vLTx">
+                    <node concept="37vLTw" id="79TFkryAZsL" role="2Oq$k0">
+                      <ref role="3cqZAo" node="79TFkryAZsx" resolve="modell" />
+                    </node>
+                    <node concept="2SmgA7" id="79TFkryAZsM" role="2OqNvi">
+                      <node concept="chp4Y" id="79TFkryAZsN" role="1dBWTz">
+                        <ref role="cht4Q" to="xxir:jksL7exwyH" resolve="ILogicalChildOwner" />
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="37vLTw" id="79TFkryAZsO" role="37vLTJ">
+                    <ref role="3cqZAo" node="79TFkryAZsC" resolve="ilcos" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="37vLTw" id="79TFkryAZsP" role="ukAjM">
+            <ref role="3cqZAo" node="79TFkryAZsq" resolve="repository" />
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryAZsQ" role="3cqZAp" />
+        <node concept="1gVbGN" id="79TFkryAZsR" role="3cqZAp">
+          <node concept="3clFbC" id="79TFkryAZsS" role="1gVkn0">
+            <node concept="3cmrfG" id="79TFkryAZsT" role="3uHU7w">
+              <property role="3cmrfH" value="1" />
+            </node>
+            <node concept="2OqwBi" id="79TFkryAZsU" role="3uHU7B">
+              <node concept="37vLTw" id="79TFkryAZsV" role="2Oq$k0">
+                <ref role="3cqZAo" node="79TFkryAZsC" resolve="ilcos" />
+              </node>
+              <node concept="34oBXx" id="79TFkryAZsW" role="2OqNvi" />
+            </node>
+          </node>
+        </node>
+        <node concept="3cpWs8" id="79TFkryAZsX" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZsY" role="3cpWs9">
+            <property role="TrG5h" value="ilco" />
+            <node concept="3Tqbb2" id="79TFkryAZsZ" role="1tU5fm">
+              <ref role="ehGHo" to="xxir:jksL7exwyH" resolve="ILogicalChildOwner" />
+            </node>
+            <node concept="2OqwBi" id="79TFkryAZt0" role="33vP2m">
+              <node concept="37vLTw" id="79TFkryAZt1" role="2Oq$k0">
+                <ref role="3cqZAo" node="79TFkryAZsC" resolve="ilcos" />
+              </node>
+              <node concept="34jXtK" id="79TFkryAZt2" role="2OqNvi">
+                <node concept="3cmrfG" id="79TFkryAZt3" role="25WWJ7">
+                  <property role="3cmrfH" value="0" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryAZt4" role="3cqZAp" />
+        <node concept="3cpWs8" id="79TFkryAZt5" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZt6" role="3cpWs9">
+            <property role="TrG5h" value="threadNumber" />
+            <node concept="10Oyi0" id="79TFkryAZt7" role="1tU5fm" />
+            <node concept="3cmrfG" id="79TFkryAZt8" role="33vP2m">
+              <property role="3cmrfH" value="100" />
+            </node>
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryAZt9" role="3cqZAp" />
+        <node concept="3cpWs8" id="79TFkryAZta" role="3cqZAp">
+          <node concept="3cpWsn" id="79TFkryAZtb" role="3cpWs9">
+            <property role="TrG5h" value="results" />
+            <property role="3TUv4t" value="true" />
+            <node concept="_YKpA" id="79TFkryAZtc" role="1tU5fm">
+              <node concept="10Oyi0" id="79TFkryAZtd" role="_ZDj9" />
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+                        <ref role="3cqZAo" node="79TFkryAZuv" resolve="it" />
+                      </node>
+                      <node concept="liA8E" id="79TFkryAZuu" role="2OqNvi">
+                        <ref role="37wK5l" to="wyt6:~Thread.start()" resolve="start" />
+                      </node>
+                    </node>
+                  </node>
+                </node>
+                <node concept="Rh6nW" id="79TFkryAZuv" role="1bW2Oz">
+                  <property role="TrG5h" value="it" />
+                  <node concept="2jxLKc" id="79TFkryAZuw" role="1tU5fm" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3J1_TO" id="79TFkryAZux" role="3cqZAp">
+          <node concept="3clFbS" id="79TFkryAZuy" role="1zxBo7">
+            <node concept="3vwNmj" id="79TFkryAZuz" role="3cqZAp">
+              <node concept="2OqwBi" id="79TFkryAZu$" role="3vwVQn">
+                <node concept="37vLTw" id="79TFkryAZu_" role="2Oq$k0">
+                  <ref role="3cqZAo" node="79TFkryAZtj" resolve="latch" />
+                </node>
+                <node concept="liA8E" id="79TFkryAZuA" role="2OqNvi">
+                  <ref role="37wK5l" to="5zyv:~CountDownLatch.await(long,java.util.concurrent.TimeUnit)" resolve="await" />
+                  <node concept="3cmrfG" id="79TFkryAZuB" role="37wK5m">
+                    <property role="3cmrfH" value="1" />
+                  </node>
+                  <node concept="Rm8GO" id="79TFkryAZuC" role="37wK5m">
+                    <ref role="Rm8GQ" to="5zyv:~TimeUnit.SECONDS" resolve="SECONDS" />
+                    <ref role="1Px2BO" to="5zyv:~TimeUnit" resolve="TimeUnit" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3uVAMA" id="79TFkryAZuD" role="1zxBo5">
+            <node concept="3clFbS" id="79TFkryAZuE" role="1zc67A">
+              <node concept="3xETmq" id="79TFkryAZuF" role="3cqZAp">
+                <node concept="3_1$Yv" id="79TFkryAZuG" role="3_9lra">
+                  <node concept="2OqwBi" id="79TFkryAZuH" role="3_1BAH">
+                    <node concept="37vLTw" id="79TFkryAZuI" role="2Oq$k0">
+                      <ref role="3cqZAo" node="79TFkryAZuK" resolve="e" />
+                    </node>
+                    <node concept="liA8E" id="79TFkryAZuJ" role="2OqNvi">
+                      <ref role="37wK5l" to="wyt6:~Throwable.getMessage()" resolve="getMessage" />
+                    </node>
+                  </node>
+                </node>
+              </node>
+            </node>
+            <node concept="XOnhg" id="79TFkryAZuK" role="1zc67B">
+              <property role="TrG5h" value="e" />
+              <node concept="nSUau" id="79TFkryAZuL" role="1tU5fm">
+                <node concept="3uibUv" id="79TFkryAZuM" role="nSUat">
+                  <ref role="3uigEE" to="wyt6:~InterruptedException" resolve="InterruptedException" />
+                </node>
+              </node>
+            </node>
+          </node>
+        </node>
+        <node concept="3vlDli" id="79TFkryAZuN" role="3cqZAp">
+          <node concept="37vLTw" id="79TFkryAZuO" role="3tpDZB">
+            <ref role="3cqZAo" node="79TFkryAZt6" resolve="threadNumber" />
+          </node>
+          <node concept="2OqwBi" id="79TFkryAZuP" role="3tpDZA">
+            <node concept="37vLTw" id="79TFkryAZuQ" role="2Oq$k0">
+              <ref role="3cqZAo" node="79TFkryAZtb" resolve="results" />
+            </node>
+            <node concept="34oBXx" id="79TFkryAZuR" role="2OqNvi" />
+          </node>
+        </node>
+        <node concept="3clFbH" id="79TFkryC4$V" role="3cqZAp" />
+        <node concept="2Gpval" id="79TFkryC5gm" role="3cqZAp">
+          <node concept="2GrKxI" id="79TFkryC5go" role="2Gsz3X">
+            <property role="TrG5h" value="number" />
+          </node>
+          <node concept="37vLTw" id="79TFkryC8M1" role="2GsD0m">
+            <ref role="3cqZAo" node="79TFkryAZtb" resolve="results" />
+          </node>
+          <node concept="3clFbS" id="79TFkryC5gs" role="2LFqv$">
+            <node concept="3vlDli" id="79TFkryC9eX" role="3cqZAp">
+              <node concept="3cmrfG" id="79TFkryC9Ev" role="3tpDZB">
+                <property role="3cmrfH" value="2" />
+              </node>
+              <node concept="2GrUjf" id="79TFkryCa62" role="3tpDZA">
+                <ref role="2Gs0qQ" node="79TFkryC5go" resolve="number" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+    </node>
+  </node>
 </model>
 
diff --git a/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/test.com.mbeddr.mpsutil.logicalChild.msd b/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/test.com.mbeddr.mpsutil.logicalChild.msd
index 17113629f5..ddc76a336e 100644
--- a/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/test.com.mbeddr.mpsutil.logicalChild.msd
+++ b/code/languages/com.mbeddr.mpsutil/solutions/test.com.mbeddr.mpsutil.logicalChild/test.com.mbeddr.mpsutil.logicalChild.msd
@@ -17,13 +17,12 @@
     <dependency reexport="false">6354ebe7-c22a-4a0f-ac54-50b52ab9b065(JDK)</dependency>
   </dependencies>
   <languageVersions>
-    <language slang="l:85a9bace-37a1-40af-956a-7bb1b081a77c:com.mbeddr.mpsutil.logicalChild" version="0" />
-    <language slang="l:286e2375-00e3-4042-b083-84873dd623be:com.mbeddr.mpsutil.logicalChild.sandbox" version="0" />
     <language slang="l:f3061a53-9226-4cc5-a443-f952ceaf5816:jetbrains.mps.baseLanguage" version="12" />
     <language slang="l:443f4c36-fcf5-4eb6-9500-8d06ed259e3e:jetbrains.mps.baseLanguage.classifiers" version="0" />
     <language slang="l:fd392034-7849-419d-9071-12563d152375:jetbrains.mps.baseLanguage.closures" version="0" />
     <language slang="l:83888646-71ce-4f1c-9c53-c54016f6ad4f:jetbrains.mps.baseLanguage.collections" version="1" />
     <language slang="l:f61473f9-130f-42f6-b98d-6c438812c2f6:jetbrains.mps.baseLanguage.unitTest" version="1" />
+    <language slang="l:63650c59-16c8-498a-99c8-005c7ee9515d:jetbrains.mps.lang.access" version="0" />
     <language slang="l:ceab5195-25ea-4f22-9b92-103b95ca8c0c:jetbrains.mps.lang.core" version="2" />
     <language slang="l:446c26eb-2b7b-4bf0-9b35-f83fa582753e:jetbrains.mps.lang.modelapi" version="0" />
     <language slang="l:3a13115c-633c-4c5c-bbcc-75c4219e9555:jetbrains.mps.lang.quotation" version="5" />