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• level 1
• level 2
• level 21
• level 22
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<ul> <li>level 1</li> <li>level 2</li> <ul>  <li>level 21</li>  <li>level 22</li> </ul></ul>

• <ol><oi>
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1. level 1
2. level 2
1. level 21
2. level 22
• Code

<ol> <li>level 1</li> <li>level 2</li> <ol>  <li>level 21</li>  <li>level 22</li> </ol></ol>