Why are there 5 Olympic rings instead of 7?

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1. #doesn
2. #europe
3. #rings
4. #games
5. #africa
6. #limited
7. #habitation
8. #americas
9. #represented
10. #continent
11. #interlocking
12. #these
13. #olympics
14. #constant
15. #present
16. #represent
17. #continents
18. #oceania
19. #antarctica