an>  ,</span>
<span>   <span class="st">"b"</span>    , <span class="fl">2</span>  ,  <span class="fl">4</span>  ,</span>
<span>   <span class="st">"c"</span>    , <span class="fl">3</span>  ,  <span class="fl">9</span>  ,</span>
<span>   <span class="st">"d"</span>    , <span class="fl">4</span>  , <span class="fl">16</span>  <span class="op">)</span></span></code></pre></div>
<pre><code><span><span class="co">##   names x  y</span></span>
<span><span class="co">## 1     a 1  1</span></span>
<span><span cl