What is the rarest birthday month?

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Tags

1. #saucy
2. #sharing
3. #month
4. #december
5. #harvard
6. #common
7. #university
8. #meaning
9. #january
10. #least
11. #february
12. #similarly
13. #birth
14. #decades
15. #pretty
16. #study
17. #collected
18. #according
19. #making
20. #holidays
21. #september