tion of Instructional Programs
(CIP) <span class="citation">(<a href="#ref-NCES:2010">NCES
2010</a>)</span>.</p>
<div class="sourceCode" id="cb11"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># A sample of cip6 values</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/base/sort.html" class="external-link">sort</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/unique.html" class="external-link">unique</a></span><span class