      <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">v</span><span
            class="p">:</span>
                <span class="k">if</span> <span class="p">(</span><span class="n">k</span><span class="p">,</span> <span
            class="n">i</span><span class="p">[</span><span class="mi">1</span><span class="p">])</span> <span
            class="ow">not</span> <span class="ow">in</span> <span class="n">set_edge</span> <span class="ow">and</span> <span
       