return emptyListIterator();
    }
    return new ArrayItr<>(array, position);
  }

  private static final class ArrayItr<T extends @Nullable Object>
      extends AbstractIndexedListIterator<T> {
    static final UnmodifiableListIterator<Object> EMPTY = new ArrayItr<>(new Object[0], 0);

    private final T[] array;

    ArrayItr(T[] array, int position) {

    }

    @Override
    public boolean isEmpty() {
      return false;
    }

    @Override
    public Iterator<Set<E>> iterator() {
      return new AbstractIndexedListIterator<Set<E>>(size()) {
        @Override
        protected Set<E> get(int setBits) {
          return new SubSet<>(inputSet, setBits);
        }
      };
    }

    @Override