lass="fu"><a href="https://rdrr.io/r/base/droplevels.html" class="external-link">droplevels</a></span><span class="op">(</span><span class="va">Diesel</span><span class="op">[</span><span class="va">Diesel</span><span class="op">$</span><span class="va">location</span> <span class="op">==</span> <span class="st">"EastCoast"</span> <span class="op">|</span> </span></span>
<span class="r-in"><span>       <span class="va">Diesel</span><span class="op">$</span><span class="va">location</span> <span class="op">=