span><span class="nb">str</span><span class="p">,</span> <span class="nb">str</span><span class="p">]])</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
        <span class="n">res_str</span> <span class="o">=</span> <span class="s2">&quot;&quot;</span>
        <span class="k">for</span> <span class="n">pair</span> <span class="ow">in</span> <span class="n">result</span><span class="p">:</span>
            <span class="k">if</span> <span class="n">pair</span><span clas