">:</span>
            <span class="n">tree_edge_2_node</span><span class="p">[</span><span class="n">n</span><span
            class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span
            class="n">node</span><span class="p">)</span>
    <span class="k">return</span> <span class="n">ETT</span><span class="p">,</span> <span
            class="n">tree_edge_2_node</span></div>


<div class="viewcode-block" id="find_root"><a class="viewcode-back"
            