<a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="fl">2</span>, <span class="fl">1</span>, <span class="op">-</span><span class="fl">1</span>,</span></span>
<span class="r-in"><span>             <span class="op">-</span><span class="fl">3</span>, <span class="op">-</span><span class="fl">1</span>, <span class="fl">2</span>,</span></span>
<span class="r-in"><span>             <span class="op">-</span><span class="fl">2</span>,  <span class="fl">1<