diff --git a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
index d5dba757..f901036f 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/BytecodeGen.java
@@ -80,7 +80,8 @@ public class BytecodeGen implements ASTVisitor {
 	byte[] bytecode;
 	HashMap<String,byte[]> classFiles;
 	
-	ArrayList<String> methodNameAndParamsT = new ArrayList<>();
+	private final ArrayList<String> methodNameAndParamsT = new ArrayList<>();
+	private final ArrayList<String> fieldNameAndParamsT = new ArrayList<>();
 	
 	private HashMap<String, SimplifyResult> simplifyResults = new HashMap<>();
 	private List<HashMap<String, SimplifyResult>> simplifyResultsList = new ArrayList<>();
@@ -501,7 +502,14 @@ public class BytecodeGen implements ASTVisitor {
 		System.out.println(sig);
 		if(sig.charAt(sig.length()-1) != (";").charAt(0)) {
 			sig +=";";
-		}
+		}	
+		String nameAndDesc = field.getName() + "%%" + des;
+		
+		if(fieldNameAndParamsT.contains(nameAndDesc))
+			return;
+		
+		fieldNameAndParamsT.add(nameAndDesc);
+		
 		cw.visitField(field.modifier, field.getName(),
 				des, sig, 
 				null);
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/TPHExtractor.java b/src/main/java/de/dhbwstuttgart/bytecode/TPHExtractor.java
index e9f8e257..66723205 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/TPHExtractor.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/TPHExtractor.java
@@ -28,6 +28,7 @@ import de.dhbwstuttgart.syntaxtree.type.RefType;
 import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
 import de.dhbwstuttgart.typeinference.result.GenericInsertPair;
+import de.dhbwstuttgart.typeinference.result.ResultPair;
 import de.dhbwstuttgart.typeinference.result.ResultSet;
 
 /**
@@ -44,7 +45,7 @@ public class TPHExtractor extends AbstractASTWalker {
 	boolean inLocalOrParam = false;
 
 	public final ArrayList<MethodAndTPH> ListOfMethodsAndTph = new ArrayList<>();
-	final ArrayList<GenericInsertPair> allPairs = new ArrayList<>();
+	final ArrayList<ResultPair<TypePlaceholder, TypePlaceholder>> allPairs = new ArrayList<>();
 	public final ArrayList<TPHConstraint> allCons = new ArrayList<>();
 	private ResultSet resultSet;
 
@@ -97,7 +98,7 @@ public class TPHExtractor extends AbstractASTWalker {
 					if (inMethod)
 						methodAndTph.getPairs().add(ag);
 					allPairs.add(ag);
-					TPHConstraint con = new ExtendsConstraint(ag.TA1.getName(), ag.TA2.getName(), Relation.EXTENDS);
+					TPHConstraint con = new ExtendsConstraint(ag.getLeft().getName(), ag.getRight().getName(), Relation.EXTENDS);
 					if(!containsConstraint(allCons,con))
 						allCons.add(con);
 //				}
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java b/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
index 94052f9c..dd7f5d60 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/signature/Signature.java
@@ -237,7 +237,7 @@ public class Signature {
 			if(resolved instanceof TypePlaceholder) {
 				//resType.getAdditionalGenerics().forEach(ag ->{
 				resultSet.genIns.forEach(ag ->{
-					TPHConstraint constr = new ExtendsConstraint(ag.TA1.getName(), ag.TA2.getName(), Relation.EXTENDS);
+					TPHConstraint constr = new ExtendsConstraint(ag.getLeft().getName(), ag.getRight().getName(), Relation.EXTENDS);
 					if(!contains(res,constr)) {
 						res.add(constr);
 					}
@@ -249,7 +249,7 @@ public class Signature {
 				if(resType2.resolvedType instanceof TypePlaceholder) {
 					//resType2.getAdditionalGenerics().forEach(ag ->{
 					resultSet.genIns.forEach(ag ->{
-						TPHConstraint constr = new ExtendsConstraint(ag.TA1.getName(), ag.TA2.getName(), Relation.EXTENDS);
+						TPHConstraint constr = new ExtendsConstraint(ag.getLeft().getName(), ag.getRight().getName(), Relation.EXTENDS);
 						if(!contains(res,constr)) {
 							res.add(constr);
 						}
diff --git a/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodAndTPH.java b/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodAndTPH.java
index e21f974c..c2c0210e 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodAndTPH.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/utilities/MethodAndTPH.java
@@ -2,14 +2,17 @@ package de.dhbwstuttgart.bytecode.utilities;
 
 import java.util.ArrayList;
 
+import de.dhbwstuttgart.syntaxtree.type.RefTypeOrTPHOrWildcardOrGeneric;
 import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
 import de.dhbwstuttgart.typeinference.result.GenericInsertPair;
+import de.dhbwstuttgart.typeinference.result.ResultPair;
 
 public class MethodAndTPH {
 	
 	private String name;
 	private final ArrayList<String> tphs = new ArrayList<>();
-	private final ArrayList<GenericInsertPair> pairs = new ArrayList<>();
+	//private final ArrayList<GenericInsertPair> pairs = new ArrayList<>();
+	private final ArrayList<ResultPair<TypePlaceholder, TypePlaceholder>> pairs = new ArrayList<>();
 	// tphs of local variables and parameters
 	private final ArrayList<String> localTphs = new ArrayList<>();
 
@@ -21,7 +24,10 @@ public class MethodAndTPH {
 		return tphs;
 	}
 	
-	public ArrayList<GenericInsertPair> getPairs(){
+//	public ArrayList<GenericInsertPair> getPairs(){
+//		return pairs;
+//	}
+	public ArrayList<ResultPair<TypePlaceholder, TypePlaceholder>> getPairs(){
 		return pairs;
 	}
 	
diff --git a/src/main/java/de/dhbwstuttgart/typeinference/result/ResultSet.java b/src/main/java/de/dhbwstuttgart/typeinference/result/ResultSet.java
index 955c388b..8858f364 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/result/ResultSet.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/result/ResultSet.java
@@ -10,11 +10,11 @@ import java.util.stream.Collectors;
 
 public class ResultSet {
     public final Set<ResultPair> results;
-    public Set<GenericInsertPair> genIns;
+    public Set<ResultPair<TypePlaceholder, TypePlaceholder>> genIns;
     public ResultSet(Set<ResultPair> results){
         this.results = results;
         this.genIns =  results.stream().filter(a -> a instanceof PairTPHsmallerTPH)
-				              .map(b -> new GenericInsertPair( (TypePlaceholder)(b.getLeft()), (TypePlaceholder)(b.getRight())))
+				              //.map(b -> new GenericInsertPair( (TypePlaceholder)(b.getLeft()), (TypePlaceholder)(b.getRight())))
 				              .collect(Collectors.toCollection(HashSet::new));
     }
 
diff --git a/src/test/resources/bytecode/javFiles/MatrixOP.jav b/src/test/resources/bytecode/javFiles/MatrixOP.jav
index 991db9c0..21d37347 100644
--- a/src/test/resources/bytecode/javFiles/MatrixOP.jav
+++ b/src/test/resources/bytecode/javFiles/MatrixOP.jav
@@ -18,7 +18,7 @@ public class MatrixOP    extends Vector<Vector<Integer>> {
 	  }
     }
 
-	mul = (m1, m2) -> {
+	public mul = (m1, m2) -> {
         var ret = new MatrixOP();
         var i = 0;
         while(i < m1.size()) {