<h1>How to Become a Ninja</h1>
<main>
<h2>Learn the Art of Moving Stealthily</h2>
<h3>How to Hide in Plain Sight</h3>
<h3>How to Climb a Wall</h3>
<h2>Learn the Art of Battle</h2>
<h3>How to Strengthen your Body</h3>
<h3>How to Fight like a Ninja</h3>
<h2>Learn the Art of Living with Honor</h2>
<h3>How to Breathe Properly</h3>
<h3>How to Simplify your Life</h3>
</main>
Challenge: Use Headings to Show Hierarchical Relationships of Content
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[details]
```
code goes here...
```
[/details]
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