pan id="cb2-6"><a href="#cb2-6" aria-hidden="true"></a><span class="co"># 3  b 3  9 15</span></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true"></a><span class="co"># 4  a 4 10 16</span></span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true"></a><span class="co"># 5  a 5 11 17</span></span>
<span id="cb2-9"><a href="#cb2-9" aria-hidden="true"></a><span class="co"># 6  c 6 12 18</span></span></code></pre></div>
<p>When we did:</p>
<div class="sourceCode" id="cb3"><pre class="sourceCode r"><cod