u">c</span>(<span class="st">&quot;apple&quot;</span>, <span class="st">&quot;banana&quot;</span>, <span class="st">&quot;pear&quot;</span>, <span class="st">&quot;pineapple&quot;</span>)</span>
<span id="cb25-2"><a href="#cb25-2" tabindex="-1"></a></span>
<span id="cb25-3"><a href="#cb25-3" tabindex="-1"></a><span class="co"># base</span></span>
<span id="cb25-4"><a href="#cb25-4" tabindex="-1"></a><span class="fu">sub</span>(<span class="st">&quot;[aeiou]&quot;</span>, <span class="st">&quot;-&quot;</span