 , <span class="fl">1</span>  , <span class="fl">1</span>   <span class="op">|</span></span>
<span>     <span class="st">"b"</span>    , <span class="fl">2</span>  , <span class="fl">4</span>   <span class="op">|</span></span>
<span>     <span class="st">"c"</span>    , <span class="fl">3</span>  , <span class="fl">9</span>   <span class="op">|</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>
<p><