<ol>
    <li>This is an ordered list.</li>
    <li>
        This is the second item, which contains a sub list
        <ol>
            <li>This is the sub list, which is also ordered.</li>
            <li>It has two items.</li>
        </ol>
    </li>
    <li>This is the final item on this list.</li>
</ol>