implements TestSortedSetGenerator<E> {
    final Bound to;
    final Bound from;
    final E firstInclusive;
    final E lastInclusive;
    private final Comparator<? super E> comparator;
    private final TestSortedSetGenerator<E> delegate;

    public SortedSetSubsetTestSetGenerator(
        TestSortedSetGenerator<E> delegate, Bound to, Bound from) {
      this.to = to;