          </table>
                      </div>
                      <div>
                        <h4>Return Value</h4>
                        <p>self for chaining.</p>
                      </div>
                    </section>
                  </div>
                </li>
                <li class="item">
                  <div>
                    <code>
                    <a name="/s:13PredicateFlow08GroupingA0P5orNotyxxF"></a>
                    <a name="//apple_ref/swift/Method/orNot(_:)" class=