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sclass TreeSetWithDuplicates<A> {
  TreeSet<Set<A>> internal;
  Comparator<A> comparator;
  
  *(Comparator<A> *comparator) {
    internal = new TreeSet<Set<A>>((setA, setB) -> {
      ret comparator.compare(main first(setA), main first(setB));
    });
  }
  
  void add(A a) {
    Set<A> newSet = lithashset(a);
    Set<A> found = navigableSet_find(internal, newSet);
    if (found != null) found.add(a);
    else internal.add(newSet);
  }
  
  void remove(A a) {
    Set<A> newSet = lithashset(a);
    Set<A> found = navigableSet_find(internal, newSet);
    if (found == null) ret;
    found.remove(a);
    if (empty(found)) internal.remove(found);
  }
  
  A first() {
    ret main first(main first(internal));
  }
}