* 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();

    }

    @Override
    public K belowSamplesGreater() {
      return delegate.belowSamplesGreater().getKey();
    }

    @Override
    public K aboveSamplesLesser() {
      return delegate.aboveSamplesLesser().getKey();
    }

    @Override
    public K aboveSamplesGreater() {
      return delegate.aboveSamplesGreater().getKey();
    }
  }

   * 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();

    }

    @Override
    public K belowSamplesGreater() {
      return delegate.belowSamplesGreater().getKey();
    }

    @Override
    public K aboveSamplesLesser() {
      return delegate.aboveSamplesLesser().getKey();
    }

    @Override
    public K aboveSamplesGreater() {
      return delegate.aboveSamplesGreater().getKey();
    }
  }

  /**
   * Returns an element greater than the {@link #samples()} but less than {@link
   * #aboveSamplesGreater()}.
   */
  E aboveSamplesLesser();

  /**
   * Returns an element greater than the {@link #samples()} and greater than {@link
   * #aboveSamplesLesser()}.
   */
  E aboveSamplesGreater();

  /**
   * Returns an element greater than the {@link #samples()} but less than {@link
   * #aboveSamplesGreater()}.
   */
  E aboveSamplesLesser();

  /**
   * Returns an element greater than the {@link #samples()} and greater than {@link
   * #aboveSamplesLesser()}.
   */
  E aboveSamplesGreater();

      return delegate().aboveSamplesGreater();
    }

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

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

    @Override
    public Entry<K, V> aboveSamplesGreater() {
      return delegate().belowSamplesLesser();

  }

  @Override
  public String belowSamplesLesser() {
    return "!! a";
  }

  @Override
  public String belowSamplesGreater() {
    return "!! b";
  }

  @Override
  public String aboveSamplesLesser() {
    return "~~ a";
  }

  @Override
  public String aboveSamplesGreater() {
    return "~~ b";
  }

      return delegate().aboveSamplesGreater();
    }

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

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

    @Override
    public Entry<K, V> aboveSamplesGreater() {
      return delegate().belowSamplesLesser();

  }

  @Override
  public String belowSamplesLesser() {
    return "!! a";
  }

  @Override
  public String belowSamplesGreater() {
    return "!! b";
  }

  @Override
  public String aboveSamplesLesser() {
    return "~~ a";
  }

  @Override
  public String aboveSamplesGreater() {
    return "~~ b";
  }