Kinda working (for two sets)

src/main/java/rocks/zipcode/io/quiz4/generics/GenericUtils.java

@@ -17,11 +17,12 @@ public class GenericUtils {
 
         for (int i = 0; i < originalSet.size(); i++) {
             for (int j = originalSet.size() -1; j >= 0  ; j--) {
-                Set<_> sortedGroup = new HashSet<>();
-                sortedGroup.add(genericList.get(j));
+                ArrayList<_> sortedGroup = new ArrayList<>();
                 sortedGroup.add(genericList.get(i));
 
-                treeSet.insert(sortedGroup);
+                if (!treeSet.has(sortedGroup)) {
+                    treeSet.insert(sortedGroup);
+                }
             }
         }
         treeSet.insert(new ComparableTreeSet<>());