/span><span class="op">$</span><span class="fu">set_sym</span><span class="op">(</span><span class="st">"+"</span>, <span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span><span class="kw">function</span><span class="op">(</span><span class="va">a</span>, <span class="va">b</span><span class="op">)</span> <span class="va">a</span> <span class="op">*</span> <span class="va">b</span><span class="op">)</span><span class="op">)</span></span>
<spa