}

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

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

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

    @Override

                    return mapEntry("-- a", (Collection<String>) ImmutableSortedSet.of("--below"));
                  }

                  @Override
                  public Entry<String, Collection<String>> belowSamplesGreater() {
                    return mapEntry("-- b", (Collection<String>) ImmutableSortedSet.of("--below"));
                  }

                  @Override