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#3. Subheadings: Programming
Make an `<h1>` heading **Programming**, and below it two `<h2>` subheadings: **Summary**, **History**.
Checklist
- ○ The <h1> heading is "Programming"
- ○ Exactly 2 <h2> subheadings
- ○ The first <h2> is "Summary"
- ○ The second <h2> is "History"
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index.html