}
  }

  private static class ReverseList<T extends @Nullable Object> extends AbstractList<T> {
    private final List<T> forwardList;

    ReverseList(List<T> forwardList) {
      this.forwardList = checkNotNull(forwardList);
    }

    List<T> getForwardList() {
      return forwardList;
    }

    private int reverseIndex(int index) {
      int size = size();
      checkElementIndex(index, size);