return new ConcurrentSkipListMap<>();
    }

    /**
     * {@link ConcurrentSkipListMap}の新しいインスタンスを作成して返します。
     *
     * @param <K>
     *            {@link ConcurrentSkipListMap}のキーの型
     * @param <V>
     *            {@link ConcurrentSkipListMap}の値の型
     * @param c
     *            {@link Comparator}
     * @return {@link ConcurrentSkipListMap}の新しいインスタンス

   * #add}, you may wish to override {@link #addAll} to forward to this implementation.
   *
   * @since 7.0
   */
  protected boolean standardAddAll(Collection<? extends E> collection) {
    return Iterators.addAll(this, collection.iterator());
  }

  /**
   * A sensible definition of {@link #remove} in terms of {@link #iterator}, using the iterator's

   * you override {@link #listIterator()}, you may wish to override {@link #iterator} to forward to
   * this implementation.
   *
   * @since 7.0
   */
  protected Iterator<E> standardIterator() {
    return listIterator();
  }

  /**
   * A sensible default implementation of {@link #listIterator()}, in terms of {@link

  public E lower(@ParametricNullness E e) {
    return delegate().lower(e);
  }

  /**
   * A sensible definition of {@link #lower} in terms of the {@code descendingIterator} method of
   * {@link #headSet(Object, boolean)}. If you override {@link #headSet(Object, boolean)}, you may
   * wish to override {@link #lower} to forward to this implementation.
   */
  @CheckForNull
  protected E standardLower(@ParametricNullness E e) {

            <link>http://jakarta.apache.org/commons/logging/apidocs/</link>
            <link>http://jakarta.apache.org/commons/pool/apidocs/</link>
            <link>http://www.junit.org/junit/javadoc/</link>
            <link>http://logging.apache.org/log4j/docs/api/</link>
            <link>http://jakarta.apache.org/regexp/apidocs/</link>
            <link>http://jakarta.apache.org/velocity/api/</link>
          </links>
        </configuration>

  }

  /**
   * A sensible implementation of {@link SortedMultiset#elementSet} in terms of the following
   * methods: {@link SortedMultiset#clear}, {@link SortedMultiset#comparator}, {@link
   * SortedMultiset#contains}, {@link SortedMultiset#containsAll}, {@link SortedMultiset#count},
   * {@link SortedMultiset#firstEntry} {@link SortedMultiset#headMultiset}, {@link

   * Specifies the order of iteration for the elements of {@link Graph#edges()}, {@link
   * Graph#adjacentNodes(Object)}, {@link Graph#predecessors(Object)}, {@link
   * Graph#successors(Object)} and {@link Graph#incidentEdges(Object)}.
   *
   * <p>The default value is {@link ElementOrder#unordered() unordered} for mutable graphs. For
   * immutable graphs, this value is ignored; they always have a {@link ElementOrder#stable()
   * stable} order.
   *

    }
  }

  @Override
  @CheckForNull
  public Entry<K, V> lastEntry() {
    return delegate().lastEntry();
  }

  /**
   * A sensible definition of {@link #lastEntry} in terms of the {@code iterator()} of the {@link
   * #entrySet} of {@link #descendingMap}. If you override {@code descendingMap}, you may wish to
   * override {@code lastEntry} to forward to this implementation.
   */
  @CheckForNull

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