nk">c</a></span><span class="op">(</span><span class="fl">5</span>, <span class="fl">6</span>, <span class="fl">7</span>, <span class="fl">8</span>, <span class="cn">NA</span><span class="op">)</span><span class="op">)</span>, 
          row.names <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="cn">NA</span>, <span class="op">-</span><span class="fl">5L</span><span class="op">)</span>, class <span clas