How often is the UEFA Nations League?

Related questions

1. How does the Euro 2020 qualifying work?
2. Do the Nations League winners qualify?
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Tags

1. #meaning
2. #stage
3. #years
4. #league
5. #played
6. #finals
7. #numbered
8. #november
9. #champion
10. #season
11. #nations
12. #following
13. #september
14. #crowned
15. #every