</span> <span class="n">queue</span><span
            class="o">.</span><span class="n">pop</span><span class="p">()</span>
    <span class="n">edge_tour</span> <span class="o">=</span> <span class="p">[]</span>
    <span class="n">seen</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
    <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span
            class="p">(</span><span class="nb">len</span><span class="p"