rr</span><span class="p">,</span><span class="n">imiddle</span><span class="p">).</span><span class="n">eq</span><span class="p">.</span><span class="mi">40</span><span class="p">,</span><span class="s1">&#39;find median&#39;</span><span class="p">)</span><span class="w"></span>
<span class="w">   </span><span class="c">! sort the hard way, one value at a time</span>
<span class="w">   </span><span class="k">call </span><span class="n">unit_check</span><span class="p">(</span><span class="s1">&#39;valnth&#3