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<div class="cell" data-hash="03-topic-models_cache/revealjs/unnamed-chunk-5_8aa527f17bfb02564224c8975046622d">
<div class="sourceCode cell-code" id="cb4"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb4-1"><a href="#cb4-1"></a>books_by_document <span class="ot">&lt;-</span> books <span class="sc">%&gt;%</span></span>
<span id="cb4-2"><a href="#cb4-2"></a>    <span class="fu">group_by</span>(title) <span class="sc">%&gt;%</span></span>
<span id