ss='op'>=</span> <span class='st'>"FORMNAME-R:19/L:19XXXX"</span>
<span class='op'>)</span>

<span class='va'>DS</span> <span class='op'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></span><span class='op'>(</span>
 STUDYID <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/rep.html'>rep</a></span><span class='op'>(</span><span class='fl'>1</span>, <span class='fl'>3</span><span class='op'>)</span>,
 USUBJID <span class='op'>=</span> <s