* key of {@link #aboveSamplesGreater()}.
   */
  Entry<K, V> aboveSamplesLesser();

  /**
   * Returns an entry with a key greater than the keys of the {@link #samples()} and greater than
   * the key of {@link #aboveSamplesLesser()}.
   */
  Entry<K, V> aboveSamplesGreater();

   * key of {@link #aboveSamplesGreater()}.
   */
  Entry<K, V> aboveSamplesLesser();

  /**
   * Returns an entry with a key greater than the keys of the {@link #samples()} and greater than
   * the key of {@link #aboveSamplesLesser()}.
   */
  Entry<K, V> aboveSamplesGreater();