}

  @Override
  public Iterator<E> iterator() {
    return new MapBasedMultisetIterator();
  }

  /*
   * Not subclassing AbstractMultiset$MultisetIterator because next() needs to
   * retrieve the Map.Entry<E, Count> entry, which can then be used for
   * a more efficient remove() call.
   */
  private class MapBasedMultisetIterator implements Iterator<E> {
    final Iterator<Map.Entry<E, Count>> entryIterator;