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<p>What do you predict will happen if we run the following code? ü§î</p>
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<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1"></a>books_by_document <span class="ot">&lt;-</span> books <span class="sc">%&gt;%</span></span>
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