What does ELO mean in LoL?

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Tags

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2. #skill
3. #actual
4. #method
5. #calculating
6. #named
7. #professor
8. #levels
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11. #hungarian
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13. #physics
14. #rating
15. #relative
16. #games
17. #system
18. #creator
19. #chess
20. #pretty
21. #arpad
22. #definition
23. #versus
24. #american
25. #league