* requirement {@link com.google.common.collect.testing.features.CollectionFeature#KNOWN_ORDER}.
   */
  protected List<E> getOrderedElements() {
    List<E> list = new ArrayList<>();
    for (E e : getSubjectGenerator().order(new ArrayList<E>(getSampleElements()))) {
      list.add(e);
    }
    return Collections.unmodifiableList(list);
  }

  /**

   * requirement {@link com.google.common.collect.testing.features.CollectionFeature#KNOWN_ORDER}.
   */
  protected List<E> getOrderedElements() {
    List<E> list = new ArrayList<>();
    for (E e : getSubjectGenerator().order(new ArrayList<E>(getSampleElements()))) {
      list.add(e);
    }
    return Collections.unmodifiableList(list);
  }

  /**