* streams, not iterables).
   *
   * @since 13.0 (required {@code Function<E, Iterable<T>>} until 14.0)
   */
  public <T extends @Nullable Object> FluentIterable<T> transformAndConcat(
      Function<? super E, ? extends Iterable<? extends T>> function) {
    return FluentIterable.concat(transform(function));
  }

  /**

   * streams, not iterables).
   *
   * @since 13.0 (required {@code Function<E, Iterable<T>>} until 14.0)
   */
  public <T extends @Nullable Object> FluentIterable<T> transformAndConcat(
      Function<? super E, ? extends Iterable<? extends T>> function) {
    return FluentIterable.concat(transform(function));
  }

  /**