pan class="o">*</span><span class="p">,</span> <span class="s1">&#39;(a)&#39;</span> <span class="p">)</span> <span class="s1">&#39;  (None)&#39;</span>
       <span class="k">return</span>
<span class="k">    end if</span>

<span class="k">    do </span><span class="n">j2lo</span> <span class="o">=</span> <span class="nb">max</span> <span class="p">(</span> <span class="n">jlo</span><span class="p">,</span> <span class="mi">1</span> <span class="p">),</span> <span class="nb">min</span> <span class="p">(</s