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src/main/java/rocks/zipcode/io/quiz4/collections/ComparableTreeSet.java

  * @author leon on 11/12/2018.
  */
 
-public class ComparableTreeSet<_> implements Comparable<_>{
+public class ComparableTreeSet<_> extends TreeSet implements Comparable<_>{
     TreeSet<_> treeSet;
 
     public ComparableTreeSet(_... arr) {