span> <span class="dv">1</span>, <span class="at">stop =</span> <span class="dv">6</span>)</span>
<span id="cb8-5"><a href="#cb8-5" tabindex="-1"></a><span class="co">#&gt; [1] &quot;Hadley&quot; &quot;Ada Lo&quot;</span></span>
<span id="cb8-6"><a href="#cb8-6" tabindex="-1"></a><span class="fu">substr</span>(<span class="fu">c</span>(hw,al), <span class="at">start =</span> <span class="fu">c</span>(<span class="dv">1</span>,<span class="dv">1</span>), <span class="at">stop =</span> <span class="fu">c</spa