an class="p">;</span>

    <span class="k">if</span> <span class="nb">size</span><span class="p">(</span><span class="n">Xk</span><span class="p">,</span><span class="mi">1</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">||</span> <span class="nb">size</span><span class="p">(</span><span class="n">Xk</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span> <span class="o">==</span> <span class="mi">0</span>
        <span class="n">ini