lass="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"Vehicle"</span>,<span class="cn">NA</span>,<span class="cn">NA</span>,<span class="cn">NA</span>,<span class="st">"Truck"</span>,</span>
<span>                       <span class="st">"Motorcycle"</span>,<span class="st">"Sedan"</span>,<span class="st">"Van"</span><span class="op">)</span>,</span>
<span>                X2 <span class="op">=</span> <span class="fu"><a href="https://rd