s="va">P</span><span class="op">[</span>,<span class="fl">1</span><span class="op">]</span> <span class="op">&lt;-</span> <span class="fl">1</span></span>
<span>    <span class="kw">for</span> <span class="op">(</span><span class="va">cc</span> <span class="kw">in</span> <span class="fl">2</span><span class="op">:</span><span class="va">ncat</span><span class="op">)</span><span class="op">{</span></span>
<span>        <span class="va">P</span><span class="op">[</span>,<span class="va">cc</span><span class="