ternal-link">add_footnote</a></span><span 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="fu"><a href="https://rdrr.io/r/base/paste.html" class="external-link">paste</a></span><span class="op">(</span><span class="st">"This footnote is pretty long. In fact, it runs over several lines"</span>,
          <span class="st">"of standard PDF output. Luckily that's no problem thanks to"</span>,
          <span 