* Creates and returns a new instance of {@link ConcurrentSkipListMap}.
     *
     * @param <K> the key type of {@link ConcurrentSkipListMap}
     * @param <V> the value type of {@link ConcurrentSkipListMap}
     * @return a new instance of {@link ConcurrentSkipListMap}
     * @see ConcurrentSkipListMap#ConcurrentSkipListMap()
     */
    public static <K, V> ConcurrentSkipListMap<K, V> newConcurrentSkipListMap() {