<ul>
<li><a href="3">Some Page 1</a></li>
<li><a href="3">Some Page 2</a></li>
<li><a href="3">Some Page 3</a>
<ul>
<li><a href="3">Some SubPage 1</a></li>
<li><a href="3">Some SubPage 2</a></li>
<li><a href="3">Some SubPage 3</a></li>
</ul>
</li>
<li><a href="3">Some Page 4</a></li>
<li><a href="3">Some Page 5</a></li>
<li><a href="3">Some Page 6</a></li>
</ul>
The same layout of the menu can be used also in the DDR Menu module by entering "DNNStandardSide" in the field "Menu style", below the "Menu settings" tab.