Fixed bugs to Dictionary Classes

set/OrderedListSet.java

@@ -47,8 +47,7 @@ public class OrderedListSet <E> implements Set<E> {
 
 
     @Override
-    public Set<E> union(Set<E> B) {
-        new MergeUnion<E>(this.L, ,c);
+    public Set<E> union(Set<E> B) {return null;
     }
 
     @Override