pan class="w"> </span><span class="mi">1</span>
<span class="w">            </span><span class="k">DO </span><span class="n">i</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">istart</span><span class="w"> </span><span class="p">,</span><span class="w"> </span><span class="n">iend</span>
<span class="w">               </span><span class="k">IF</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">X</span><span class="p">(</