pan class="op">(</span><span class="va">cl8</span><span class="op">)</span>,</span>
<span>    cl9 <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor</a></span><span class="op">(</span><span class="va">cl9</span><span class="op">)</span>,</span>
<span>    cl10 <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/factor.html" class="external-link">factor</a></span><span class="op">(</span><span class="va">cl10</span><span 