* {@code Iterator} supports it.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Stream#concat}.
   *
   * @since 18.0
   */
  public final FluentIterable<E> append(Iterable<? extends E> other) {
    return FluentIterable.concat(getDelegate(), other);
  }

  /**
   * Returns a fluent iterable whose iterators traverse first the elements of this fluent iterable,

   * {@code Iterator} supports it.
   *
   * <p><b>{@code Stream} equivalent:</b> {@link Stream#concat}.
   *
   * @since 18.0
   */
  public final FluentIterable<E> append(Iterable<? extends E> other) {
    return FluentIterable.concat(getDelegate(), other);
  }

  /**
   * Returns a fluent iterable whose iterators traverse first the elements of this fluent iterable,