<span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">leaves</span><span class="p">):</span>
            <span class="k">if</span> <span class="n">v</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">labels</span><span class="o">.</span><span class="n">values</span><span class="p">():</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">labels</sp