What is every 6 months called?

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Tags

1. #period
2. #months
3. #occurrence
4. #happens
5. #because
6. #every
7. #means
8. #preferred
9. #periodicity
10. #which
11. #twice
12. #times
13. #semiannual
14. #something
15. #either
16. #regular
17. #clarity