diff --git a/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java b/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
index a3430577b..a8c0675dd 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/unify/RuleSet.java
@@ -326,7 +326,8 @@ public class RuleSet implements IRuleSet{
 			lhsSType = (ReferenceType) lhsType;
 			rhsSType = (ReferenceType) rhsType;
 		}
-		else if ((lhsType instanceof WildcardType) && (rhsType instanceof WildcardType)) {
+		else if (((lhsType instanceof ExtendsType) && (rhsType instanceof ExtendsType)) 
+				|| ((lhsType instanceof SuperType) && (rhsType instanceof SuperType))) {
 			UnifyType lhsSTypeRaw = ((WildcardType) lhsType).getWildcardedType();
 			UnifyType rhsSTypeRaw = ((WildcardType) rhsType).getWildcardedType();
 			if ((lhsSTypeRaw instanceof ReferenceType) && (rhsSTypeRaw instanceof ReferenceType)) {
diff --git a/src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java b/src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
index 8b2c7c3ce..da3d508b0 100644
--- a/src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
+++ b/src/main/java/de/dhbwstuttgart/typeinference/unify/TypeUnifyTask.java
@@ -810,6 +810,23 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 						nextSetasListRest.remove(a_next);
 					}
 				}
+				//Alle maximale Elemente in  nextSetasListRest bestimmen
+				List<Set<UnifyPair>> nextSetasListRestTest;
+				do {
+					nextSetasListRestTest = new ArrayList<Set<UnifyPair>>(nextSetasListRest);
+					if (!nextSetasListRest.isEmpty()) {
+						Set<UnifyPair> max = oup.max(nextSetasListRest.iterator());
+						Iterator<Set<UnifyPair>> nextSetasListItRest2 = new ArrayList<Set<UnifyPair>>(nextSetasListRest).iterator();
+						while (nextSetasListItRest2.hasNext()) {
+							Set<UnifyPair> a_nextRest = nextSetasListItRest2.next();
+							if (//a.equals(a_next) || 
+									(oup.compare(max, a_nextRest) == 1)) {
+								nextSetasListRest.remove(a_nextRest);
+							}
+						
+						}}
+				} while(!nextSetasListRestTest.equals(nextSetasListRest));
+				
 			}
 			else if (variance == -1) {
 				a = oup.min(nextSetasList.iterator());
@@ -823,6 +840,23 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 						nextSetasListRest.remove(a_next);
 					}
 				}
+				//Alle minimalen Elemente in  nextSetasListRest bestimmen
+				
+					List<Set<UnifyPair>> nextSetasListRestTest;
+					do {
+						nextSetasListRestTest = new ArrayList<Set<UnifyPair>>(nextSetasListRest);
+						if (!nextSetasListRest.isEmpty()) {
+							Set<UnifyPair> min = oup.min(nextSetasListRest.iterator());
+							Iterator<Set<UnifyPair>> nextSetasListItRest2 = new ArrayList<Set<UnifyPair>>(nextSetasListRest).iterator();
+							while (nextSetasListItRest2.hasNext()) {
+								Set<UnifyPair> a_nextRest = nextSetasListItRest2.next();
+								if (//a.equals(a_next) || 
+										(oup.compare(min, a_nextRest) == -1)) {
+									nextSetasListRest.remove(a_nextRest);
+								}
+						
+							}}
+					} while(!nextSetasListRestTest.equals(nextSetasListRest));
 			}
 			else if (variance == 2) {
 				a = nextSetasList.remove(0);
@@ -1860,13 +1894,17 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 				
 		for(UnifyType c : csPHRenamed) {
 			//PL 18-02-05 getChildren durch smaller ersetzt in getChildren werden die Varianlen nicht ersetzt.
-			Set<UnifyType> thetaQs = fc.smaller(c, new HashSet<>()).stream().collect(Collectors.toCollection(HashSet::new));
+			Set<UnifyType> thetaQs = new HashSet<>();
+			//TODO smaller wieder reinnehmen? 
+			//thetaQs.add(c);//
+			thetaQs = fc.smaller(c, new HashSet<>()).stream().collect(Collectors.toCollection(HashSet::new));
 			//Set<UnifyType> thetaQs = fc.getChildren(c).stream().collect(Collectors.toCollection(HashSet::new));
 		    //thetaQs.add(thetaPrime); //PL 18-02-05 wieder geloescht
 			                           //PL 2017-10-03: War auskommentiert habe ich wieder einkommentiert, 
 		                               //da children offensichtlich ein echtes kleiner und kein kleinergleich ist
 			
 			//PL 18-02-06: eingefuegt, thetaQs der Form V<V<...>> <. V'<V<...>> werden entfernt
+			//TODO PL 19-01-14 wieder reinnehmen kurzfristig auskommentiert 
 			thetaQs = thetaQs.stream().filter(ut -> ut.getTypeParams().arePlaceholders()).collect(Collectors.toCollection(HashSet::new));
 			//PL 18-02-06: eingefuegt
 			
@@ -1931,13 +1969,16 @@ public class TypeUnifyTask extends RecursiveTask<Set<Set<UnifyPair>>>  {
 						if(allGen) {
 							UnifyPair up = new UnifyPair(a, theta, PairOperator.EQUALSDOT, pair.getSubstitution(), pair);
 							Iterator<UnifyType> upit = up.getRhsType().getTypeParams().iterator();
-							while (upit.hasNext()) ((PlaceholderType)upit.next()).setVariance(a.getVariance());
+							//TODO PL 2019-01-24: upit.next() ist nicht unbedingt ein PlaceholderType -> Visitor
+							while (upit.hasNext()) upit.next().accept(new distributeVariance(), a.getVariance());//((PlaceholderType)upit.next()).setVariance(a.getVariance());
 							resultPrime.add(up);
 						}
 						else {
 							UnifyPair up = new UnifyPair(a, theta.setTypeParams(new TypeParams(freshTphs.toArray(new UnifyType[0]))), PairOperator.EQUALSDOT, pair.getSubstitution(), pair);
 							Iterator<UnifyType> upit = up.getRhsType().getTypeParams().iterator();
-							while (upit.hasNext()) ((PlaceholderType)upit.next()).setVariance(a.getVariance());
+							distributeVariance dv = new distributeVariance();
+							//TODO PL 2019-01-24: upit.next() ist nicht unbedingt ein PlaceholderType -> Visitor
+							while (upit.hasNext()) upit.next().accept(new distributeVariance(), a.getVariance()); //((PlaceholderType)upit.next()).setVariance(a.getVariance());
 							resultPrime.add(up);
 						}
 						resultPrime.addAll(substitutionSet);