><span class="op">*</span><span class="va">x</span><span class="op">**</span><span class="fl">2</span> <span class="op">+</span> <span class="va">x</span><span class="op">**</span><span class="fl">3</span></span></span>
<span class="r-in"><span>  <span class="fu">collect</span><span class="op">(</span><span class="va">expr</span>, <span class="va">x</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</