diff --git a/src/de/dhbwstuttgart/typeinference/unify/TypeUnify.java b/src/de/dhbwstuttgart/typeinference/unify/TypeUnify.java
index fa190cb7..68185369 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/TypeUnify.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/TypeUnify.java
@@ -1,6 +1,7 @@
 package de.dhbwstuttgart.typeinference.unify;
 
 import java.io.FileWriter;
+import java.util.ConcurrentModificationException;
 import java.util.Set;
 import java.util.concurrent.ForkJoinPool;
 
@@ -11,7 +12,12 @@ public class TypeUnify {
 	public Set<Set<UnifyPair>> unify(Set<UnifyPair> eq, IFiniteClosure fc, FileWriter logFile, Boolean log) {
 		TypeUnifyTask unifyTask = new TypeUnifyTask(eq, fc, true, logFile, log);
 		ForkJoinPool pool = new ForkJoinPool();
+		try {
 		pool.invoke(unifyTask);
+		}
+		catch (ConcurrentModificationException v) {
+			v.printStackTrace();
+		}
 		Set<Set<UnifyPair>> res =  unifyTask.join();
 		return res;
 	}
diff --git a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
index a7f90a17..16201b54 100644
--- a/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
+++ b/src/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
@@ -150,7 +150,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 	 * @param fc The finite closure
 	 * @return The set of all principal type unifiers
 	 */
-	protected Set<Set<UnifyPair>> unify(Set<UnifyPair> eq, IFiniteClosure fc, boolean parallel)  {
+	protected Set<Set<UnifyPair>> unify(final Set<UnifyPair> eq, IFiniteClosure fc, boolean parallel)  {
 		//Set<UnifyPair> aas = eq.stream().filter(x -> x.getLhsType().getName().equals("AA") //&& x.getPairOp().equals(PairOperator.SMALLERDOT)
 		//		).collect(Collectors.toCollection(HashSet::new));
 		//writeLog(nOfUnify.toString() + " AA: " + aas.toString());
@@ -463,7 +463,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 			List<Set<UnifyPair>> nextSetasListRest= new ArrayList<>();
 			if (variance == 1) {
 				a = oup.max(nextSetasList.iterator());
-				//nextSetasList.remove(a);
+				nextSetasList.remove(a);
 				nextSetasListRest = new ArrayList<>(nextSetasList);
 				Iterator<Set<UnifyPair>> nextSetasListItRest = new ArrayList<Set<UnifyPair>>(nextSetasListRest).iterator();
 				while (nextSetasListItRest.hasNext()) {
@@ -511,6 +511,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 			//if (remainingSets.isEmpty()) {//muss immer gegeben sein, weil nur 1 Element der topLevelSets mehr als ein Elemet enthaelt
 				//writeLog("Vor unify2 Aufruf: " + eq.toString());
 			Set<Set<UnifyPair>> res = new HashSet<>();
+			Set<Set<UnifyPair>> add_res = new HashSet<>();
 			if(parallel && (variance == 1)) {
 				/*
 				elems.add(a);
@@ -520,15 +521,21 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				*/
 				
 				Set<TypeUnifyTask> forks = new HashSet<>();
+				
+				//TypeUnify2Task fork1 = new TypeUnify2Task(elems, eq, fc, parallel, logFile, log);
+				Set<UnifyPair> newEq = new HashSet<>(eq);
 				for(Set<UnifyPair> nSaL : nextSetasListRest) {
-					elems.add(nSaL);
-					TypeUnify2Task fork = new TypeUnify2Task(elems, eq, fc, parallel, logFile, log);
+					Set<Set<UnifyPair>> newElems = new HashSet<>(elems);
+					newElems.add(nSaL);
+					TypeUnify2Task fork = new TypeUnify2Task(newElems, newEq, fc, parallel, logFile, log);
 					forks.add(fork);
 					fork.fork();
 				}
+				res = unify2(elems, eq, fc, parallel);
+				//res = fork1.join();
 				for(TypeUnifyTask fork : forks) {
-					res.addAll(fork.join());
-					System.out.println("");
+					Set<Set<UnifyPair>> fork_res = fork.join();
+					add_res.addAll(fork_res);
 				}
 				
 			}
@@ -566,6 +573,10 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 					System.out.print("");
 				Iterator<Set<UnifyPair>> nextSetasListIt = new ArrayList<Set<UnifyPair>>(nextSetasList).iterator(); 
 				if (variance == 1) {
+					if (parallel) {
+						result.addAll(add_res);
+						break;
+					}
 					/* nextSetasList = nextSetasListRest; */
 					/* wird bereits vor den unify2-Aufruf durchgefuehrt und nextSetasListRest zugeordnet
 					*/
@@ -578,6 +589,7 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 						}
 					}
 					
+					
 				}
 				else { if (variance == -1) {
 					System.out.println("");
diff --git a/test/bytecode/javFiles/Matrix.jav b/test/bytecode/javFiles/Matrix.jav
index 2ba7f307..5600ad88 100644
--- a/test/bytecode/javFiles/Matrix.jav
+++ b/test/bytecode/javFiles/Matrix.jav
@@ -1,6 +1,6 @@
 import java.util.Vector;
 import java.lang.Integer;
-//import java.lang.Byte;
+import java.lang.Byte;
 import java.lang.Boolean;
 
 public class Matrix extends Vector<Vector<Integer>> {