span class="op">(</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="op">}</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> - <span style="font-weight: bold;">set_a</span>: Set the 'a' value to use in the add_a function</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> - <span style="font-weight: bold;">add_a</span>: Add a 'a' value defined separately</span>
<span class="r-out co"><span class="r-p