span><span class="cn">NA</span>,<span class="st">"ills"</span>,<span class="st">"ds"</span><span class="op">)</span>,</span></span>
<span class="r-in"><span>    data<span class="op">=</span><span class="va">tg</span>,keep<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="st">"x1"</span>,<span class="st">"x2"</span><span class="op">)</span>,trans<span class="op">=</span><span class="va">tmat</span><span cla