f</span> <span class="n">out</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span> <span class="o">==</span> <span class="s2">&quot; &quot;</span><span class="p">:</span>
                <span class="n">out</span> <span class="o">=</span> <span class="n">out</span><span class="p">[:</span><span class="o">-</span><span class="mi">1</span><span class="p">]</span>
            <span class="n">out</span> <span class="o">+=</span> <span class="n">t</span> <span cl