</span> <span class="op">&lt;-</span> <span class="va">firstnames</span></span>
<span></span>
<span><span class="fu"><a href="https://rdrr.io/r/utils/head.html" class="external-link">head</a></span><span class="op">(</span><span class="va">ToothGrowth</span><span class="op">)</span></span></code></pre></div>
<pre><code><span><span class="co">##    len supp dose firstnames</span></span>
<span><span class="co">## 1  4.2   VC  0.5       John</span></span>
<span><span class="co">## 2 11.5   VC  0.5    William</