 class="no">filtered</span>, <span class="no">l2</span>$<span class="no">aggregated</span>, <span class="kw">by</span> <span class="kw">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html">c</a></span>(<span class="st">'cas'</span>, <span class="st">'cname'</span>))
<span class="no">cas20</span> <span class="kw">=</span> <span class="no">l2</span>$<span class="no">aggregated</span>[ <span class="fu"><a href="https://Rdatatable.gitlab.io/data.table/reference/setorder.html">order</a></span>(-<spa