oins:</p><ul><li><p>use with <code><a href="left_join.html">right_join()</a></code> to convert implicit missing values to explicit missing values</p></li>
<li><p>use with <code><a href="left_join.html">anti_join()</a></code> to find out which combinations are missing</p></li>
</ul><p><code>nesting()</code> is a helper that only finds combinations already present in the dataset.</p>
    </div>

    <div id="ref-usage">
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">expand<