ass="fu"><a href="../reference/labels.html">labels</a></span><span class="op">(</span><span class="va">x2</span><span class="op">)</span> <span class="op">&lt;-</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="st">"Does not know"</span> <span class="op">=</span> <span class="op">-</span><span class="fl">92</span>, <span class="st">"Not responded"</span> <span class="op">=</span> <span class="op">-</span><span class="fl">9