How many avatars were there before Korra?

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Tags

1. #statues
2. #considering
3. #there
4. #temple
5. #southern
6. #including
7. #should
8. #amount
9. #close
10. #avatars
11. #visited
12. #episode
13. #approximation
14. #10000
15. #korra
16. #years
17. #avatar
18. #three