How many keywords should be on a page?

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Tags

1. #number
2. #micro
3. #different
4. #particular
5. #homepage
6. #pages
7. #these
8. #keywords
9. #approach
10. #whether
11. #bottom
12. #strictly
13. #landing
14. #focus
15. #specific
16. #start
17. #topic
18. #keyword