<span class="n">s</span> <span class="o">=</span> <span class="mi">1</span>
                    <span class="n">check</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_check</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">x</span><span class="p">)</span>
                    <span class="k">if</span> <span class="n">check</span> <span class="o">==</span> <span class="mi">1</span><span class="p">:</span>
        