n
            class="p">(</span><span class="n">S</span><span class="o">.</span><span class="n">node_to_label</span><span
            class="p">[</span><span class="n">k</span><span class="p">[</span><span class="mi">2</span><span class="p">]],</span> <span
            class="n">S</span><span class="o">.</span><span class="n">node_to_label</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="mi">2