k">ELSEIF</span><span class="w"> </span><span class="p">(</span><span class="w"> </span><span class="n">ix0</span><span class="o">==</span><span class="n">N</span><span class="w"> </span><span class="p">)</span><span class="w"> </span><span class="k">THEN</span>
<span class="k">         </span><span class="n">ix0</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">ix0</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="mi">1</s