pan class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"white"</span>, <span class="st">"red"</span>, <span class="st">"blue"</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
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<h2 id="models-with-unobserved-confoundi