>
<span>               input <span class="op">=</span> <span class="op">{</span></span>
<span>                 <span class="fu"><a href="../reference/modify_item.html">modify_item</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/list.html" class="external-link">list</a></span><span class="op">(</span>q_default <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/ifelse.html" class="external-link">ifelse</a></span><span class="op">(</span><span class="