ref="https://rdrr.io/r/base/paste.html" class="external-link">paste</a></span><span class="op">(</span><span class="st">'z'</span>, <span class="fl">1</span><span class="op">:</span><span class="fl">100</span>, sep <span class="op">=</span> <span class="st">"_"</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">N</span> <span class="op">&lt;-</span> <span class="fl">500</span></span></span>
<span class="r-in"><span><span class="va">d</span> <span