n class="bp">self</span><span class="o">.</span><span class="n">tracks</span><span class="p">)</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">stack</span><span class="o">.</span><span class="n">erase_child</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span></div>


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