a>.</p>
<div class="sourceCode" id="cb1"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="co"># install and load devtools from CRAN</span></span>
<span><span class="co"># install.packages("devtools")</span></span>
<span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="va"><a href="https://devtools.r-lib.org/" class="external-link">devtools</a></span><span class="op">)</span></span>
<sp