How does the UEFA Champions League work?

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Tags

1. #placed
2. #group
3. #groups
4. #nation
5. #enters
6. #round
7. #stage
8. #together
9. #runners
10. #winning
11. #europa
12. #third
13. #making
14. #teams
15. #league
16. #drawn
17. #progress
18. #whilst
19. #seeding