         Sequence</a> else, <a class="link" href="../../../iterator/concepts/bidirectional_iterator.html" title="Bidirectional Iterator">Bidirectional
                Iterator</a> if <code class="computeroutput"><span class="identifier">seq</span></code>
                is a <a class="link" href="../../concepts/bidirectional_sequence.html" title="Bidirectional Sequence">Bidirectional
                Sequence</a> else, <a class="link" href="../../../iterator/concepts/random_access_iterator.html" title="Rando