>    , <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>
<span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/print.html" class="external-link">print</a></span><span class="op">(</span><span c