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<html>
<body>
<h1>Alternate between ul and ol elements when nesting</h1>
<ul>
<li>
first item
<ol>
<li>first item</li>
<li>second item</li>
<li>third item</li>
</ol>
</li>
<li>second item</li>
<li>third item</li>
</ul>
</body>
</html>