}

    @Override
    public SortedSet<K> create(Object... elements) {
      return (SortedSet<K>) super.create(elements);
    }

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

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

    @Override