How does group stage in World Cup work?

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1. #where
2. #group
3. #worth
4. #stage
5. #format
6. #split
7. #works
8. #three
9. #round
10. #begins
11. #point
12. #teams
13. #plays
14. #country
15. #world
16. #other
17. #points
18. #compete
19. #robin
20. #regions
21. #national