* {@link #addAll(Collection)} to forward to this implementation.
   *
   * @since 7.0
   */
  @Override
  protected boolean standardAddAll(Collection<? extends E> elementsToAdd) {
    return Multisets.addAllImpl(this, elementsToAdd);
  }

  /**
   * A sensible definition of {@link #remove(Object)} in terms of {@link #remove(Object, int)}. If