}

    @Override
    public String toString() {
      return "orderedPermutationCollection(" + inputList + ")";
    }
  }

  private static final class OrderedPermutationIterator<E> extends AbstractIterator<List<E>> {
    @CheckForNull List<E> nextPermutation;
    final Comparator<? super E> comparator;

    OrderedPermutationIterator(List<E> list, Comparator<? super E> comparator) {

    }

    @Override
    public String toString() {
      return "orderedPermutationCollection(" + inputList + ")";
    }
  }

  private static final class OrderedPermutationIterator<E> extends AbstractIterator<List<E>> {
    @CheckForNull List<E> nextPermutation;
    final Comparator<? super E> comparator;

    OrderedPermutationIterator(List<E> list, Comparator<? super E> comparator) {