r>						
<p>To test <code>count_lowercase_vowels</code>, we need to:</p>
	<ul>
		<li>pick values for the string argument, and </li>
		<li>call the function to ensure it returns what we expect for each case.</li>
	</ul>
	It is not realistic to test using every single possible string argument. Instead, we create relevant categories, and choose one representative string argument from each category.
	To choose the string argument, consider:
	<ul>
		<li>the length of the string, and</li>
		<li>the characters tha