hen</span>
<span class="k">                  do </span><span class="n">j</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">,</span><span class="n">n</span><span class="w"></span>
<span class="w">                      </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">x</span><span class="p">(</span><span class="n">j</span><span class="p">).</span><span class="n">ne</span><span class="p">.</span>