diff --git a/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java b/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
index b28bfb41..3ebd5430 100644
--- a/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
+++ b/src/main/java/de/dhbwstuttgart/target/generate/ASTToTargetAST.java
@@ -116,6 +116,8 @@ public class ASTToTargetAST {
                     }
                     return false;
                 });
+            } else if (input.stream().anyMatch(p -> p.getLeft().equals(pair.getLeft()))) {
+                return;
             }
 
             input.add(pair);
@@ -605,14 +607,14 @@ public class ASTToTargetAST {
                     if (left.equals(tph)) {
                         var pair = new PairTPHsmallerTPH(tph, right);
                         if (!generics.contains(pair)) {
-                            generics.add(pair);
+                            addToPairs(generics, pair);
                             findAllBounds(right, generics, equality);
                             found = true;
                         }
                     }
                 }
                 if (!found)
-                    generics.add(new PairTPHequalRefTypeOrWildcardType(tph, OBJECT));
+                    addToPairs(generics, new PairTPHequalRefTypeOrWildcardType(tph, OBJECT));
             } else if (type instanceof RefType refType) {
                 refType.getParaList().forEach(t -> findAllBounds(t, generics, equality));
             }
@@ -663,7 +665,6 @@ public class ASTToTargetAST {
                     }
                 }
             }
-            System.out.println(input);
         }
 
         void findTphs(RefTypeOrTPHOrWildcardOrGeneric type, Set<TypePlaceholder> tphs, Map<TypePlaceholder, TypePlaceholder> equality) {