diff --git a/src/main/java/de/dhbwstuttgart/typeinference/unify/ConstraintSetRepository.java b/src/main/java/de/dhbwstuttgart/typeinference/unify/ConstraintSetRepository.java
new file mode 100644
index 0000000..fb7b8e5
--- /dev/null
+++ b/src/main/java/de/dhbwstuttgart/typeinference/unify/ConstraintSetRepository.java
@@ -0,0 +1,21 @@
+package de.dhbwstuttgart.typeinference.unify;
+
+import de.dhbwstuttgart.typeinference.unify.model.UnifyPair;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class ConstraintSetRepository {
+    private Set<Integer> sets = new HashSet<>();
+
+    public boolean containsSet(Set<Set<UnifyPair>> set){
+        Integer hash = Integer.valueOf(set.hashCode());
+
+        if(sets.contains(hash)){
+            return true;
+        }else{
+            sets.add(hash);
+            return false;
+        }
+    }
+}