an class="st">                           i ~~ 0*i</span></span></span>
<span class="r-in"><span><span class="st">                           s ~~ 0*s</span></span></span>
<span class="r-in"><span><span class="st">                           i ~~ 0*s"</span>,</span></span>
<span class="r-in"><span>                  classes <span class="op">=</span> <span class="fl">2</span>,</span></span>
<span class="r-in"><span>                  data <span class="op">=</span> <span class="va">df</span><span class="op">)</spa