<span class="n">s</span> <span class="p">=</span> <span class="n">vl_erfill</span><span class="p">(</span><span class="n">I</span><span class="p">,</span><span class="n">x</span><span class="p">)</span> <span class="p">;</span>
 <span class="n">M</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="p">=</span> <span class="n">M</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span><span class="p