lowType = OPEN;
        upType = CLOSED;
      }
    }

    return new GeneralRange<>(comparator, hasLowBound, lowEnd, lowType, hasUpBound, upEnd, upType);
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj instanceof GeneralRange) {
      GeneralRange<?> r = (GeneralRange<?>) obj;
      return comparator.equals(r.comparator)
          && hasLowerBound == r.hasLowerBound

        lowType = OPEN;
        upType = CLOSED;
      }
    }

    return new GeneralRange<>(comparator, hasLowBound, lowEnd, lowType, hasUpBound, upEnd, upType);
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj instanceof GeneralRange) {
      GeneralRange<?> r = (GeneralRange<?>) obj;
      return comparator.equals(r.comparator)
          && hasLowerBound == r.hasLowerBound

  TreeMultiset(Reference<AvlNode<E>> rootReference, GeneralRange<E> range, AvlNode<E> endLink) {
    super(range.comparator());
    this.rootReference = rootReference;
    this.range = range;
    this.header = endLink;
  }

  TreeMultiset(Comparator<? super E> comparator) {
    super(comparator);
    this.range = GeneralRange.all(comparator);
    this.header = new AvlNode<>();

  TreeMultiset(Reference<AvlNode<E>> rootReference, GeneralRange<E> range, AvlNode<E> endLink) {
    super(range.comparator());
    this.rootReference = rootReference;
    this.range = range;
    this.header = endLink;
  }

  TreeMultiset(Comparator<? super E> comparator) {
    super(comparator);
    this.range = GeneralRange.all(comparator);
    this.header = new AvlNode<>();