}

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

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

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