/a></span>( <span class='no'>key</span> )

<span class='no'>df</span> <span class='kw'>&lt;-</span> <span class='no'>capitals</span>
<span class='no'>df</span>$<span class='no'>z</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/sample.html'>sample</a></span>(<span class='fl'>10000</span>:<span class='fl'>10000000</span>, <span class='kw'>size</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/nrow.html'>nrow</a></span>(<span class='no'>df</