@Override
    public @Nullable Entry<K, V> firstEntry() {
      return standardFirstEntry();
    }

    /*
     * We can't override lastEntry to delegate to standardLastEntry, as it would create an infinite
     * loop. Instead, we test standardLastEntry manually below.
     */

    @Override
    public @Nullable Entry<K, V> pollFirstEntry() {
      return standardPollFirstEntry();
    }

    @Override

      return new StandardElementSet();
    }

    @Override
    public Entry<E> firstEntry() {
      return standardFirstEntry();
    }

    @Override
    public Entry<E> lastEntry() {
      return standardLastEntry();
    }

    @Override
    public Entry<E> pollFirstEntry() {
      return standardPollFirstEntry();
    }

    @Override
    public Entry<E> pollLastEntry() {
      return standardPollLastEntry();

      return new StandardElementSet();
    }

    @Override
    public Entry<E> firstEntry() {
      return standardFirstEntry();
    }

    @Override
    public Entry<E> lastEntry() {
      return standardLastEntry();
    }

    @Override
    public Entry<E> pollFirstEntry() {
      return standardPollFirstEntry();
    }

    @Override
    public Entry<E> pollLastEntry() {
      return standardPollLastEntry();

   *
   * <p>If you override {@link #descendingMultiset} or {@link #entrySet()}, you may wish to override
   * {@link #firstEntry()} to forward to this implementation.
   */
  protected @Nullable Entry<E> standardLastEntry() {
    Iterator<Entry<E>> entryIterator = descendingMultiset().entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }
    Entry<E> entry = entryIterator.next();

   *
   * <p>If you override {@link #descendingMultiset} or {@link #entrySet()}, you may wish to override
   * {@link #firstEntry()} to forward to this implementation.
   */
  protected @Nullable Entry<E> standardLastEntry() {
    Iterator<Entry<E>> entryIterator = descendingMultiset().entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }
    Entry<E> entry = entryIterator.next();

   *
   * <p>If you override {@link #descendingMultiset} or {@link #entrySet()}, you may wish to override
   * {@link #firstEntry()} to forward to this implementation.
   */
  protected @Nullable Entry<E> standardLastEntry() {
    Iterator<Entry<E>> entryIterator = descendingMultiset().entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }
    Entry<E> entry = entryIterator.next();