 class="p">:</span>
                <span class="n">res_str</span> <span class="o">+=</span> <span class="sa">f</span><span class="s2">&quot;</span><span class="si">{</span><span class="n">pair</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="si">}</span><span class="s2">/</span><span class="si">{</span><span class="n">pair</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="si">}</span><span class="s2">+&quot;</span>
       