diff --git a/src/main/java/de/dhbwstuttgart/bytecode/gGenericsAli/FamilyOfGeneratedGenerics.java b/src/main/java/de/dhbwstuttgart/bytecode/gGenericsAli/FamilyOfGeneratedGenerics.java
index c8931c28..c9a458ac 100644
--- a/src/main/java/de/dhbwstuttgart/bytecode/gGenericsAli/FamilyOfGeneratedGenerics.java
+++ b/src/main/java/de/dhbwstuttgart/bytecode/gGenericsAli/FamilyOfGeneratedGenerics.java
@@ -185,10 +185,14 @@ public class FamilyOfGeneratedGenerics {
 
     public static boolean checkForDuplicates(TPHConstraint constraint, List list) {
         List<TPHConstraint> tempList = list;
+        boolean hasSame = false;
         for (TPHConstraint tphC: tempList) {
-           return (constraint.getLeft() == tphC.getLeft() &&
+           hasSame = constraint.getLeft() == tphC.getLeft() &&
                 constraint.getRight() == tphC.getRight() &&
-                constraint.getRel() == tphC.getRel()); //constraint already in ArrayList if true
+                constraint.getRel() == tphC.getRel(); //constraint already in ArrayList if
+//            System.out.println(hasSame);
+            if (hasSame)
+                return true;
         }
         return false;
     }
@@ -196,22 +200,23 @@ public class FamilyOfGeneratedGenerics {
     public static List<TPHConstraint> buildTransitiveClosure(List list) {
         List<TPHConstraint> iterList = list;
         List<TPHConstraint> runList = list;
-        List<TPHConstraint> tcList = new ArrayList<>();
+        List<TPHConstraint> tcList = list;
         boolean addedConToList = false;
         for (TPHConstraint cons: iterList) {
             for (TPHConstraint cons2: runList) {
                 if(cons.getRight() == cons2.getLeft()) {
-                    for (TPHConstraint tcCons: tcList) {
-                        if (!checkForDuplicates(tcCons,tcList)) {
-                            tcList.add(new TPHConstraint(cons.getLeft(), cons2.getRight(), Relation.EXTENDS)); //Duplikate? dürfte nicht sein -> checken
-                            addedConToList = true;
-                            if (addedConToList) {
-                                list.add(new TPHConstraint(cons.getLeft(), cons2.getRight(), Relation.EXTENDS));
-                                buildTransitiveClosure(list);
-                            }
+                    TPHConstraint consToAdd = new TPHConstraint(cons.getLeft(), cons2.getRight(), Relation.EXTENDS);
+//                    System.out.println(consToAdd);
+//                    System.out.println(tcList);
+//                    System.out.println(checkForDuplicates(consToAdd,tcList));
+                    if (!checkForDuplicates(consToAdd,tcList)) {
+                        tcList.add(consToAdd); //Duplikate? dürfte nicht sein -> checken
+                        addedConToList = true;
+                        if (addedConToList) {
+                            buildTransitiveClosure(tcList);
                         }
-                        //TODO: über aktualisierte Liste laufen wegen Updates -> Rekursion?
                     }
+                        //TODO: über aktualisierte Liste laufen wegen Updates -> Rekursion?
                 }
             }
         }