}

  @Override
  public SortedMultiset<E> headMultiset(E upperBound, BoundType boundType) {
    return delegate().headMultiset(upperBound, boundType);
  }

  @Override
  public SortedMultiset<E> subMultiset(
      E lowerBound, BoundType lowerBoundType, E upperBound, BoundType upperBoundType) {
    return delegate().subMultiset(lowerBound, lowerBoundType, upperBound, upperBoundType);
  }

  /**