How is La Liga winner decided?

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1. #against
2. #points
3. #record
4. #although
5. #difference
6. #separate
7. #cannot
8. #other
9. #equal
10. #teams
11. #differs
12. #goals
13. #leagues
14. #their
15. #scoring
16. #match
17. #system
18. #records
19. #accrue