What is the rivalry between Celtic and Rangers?

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Tags

1. #popular
2. #deeply
3. #scottish
4. #scotland
5. #successful
6. #become
7. #culture
8. #clubs
9. #between
10. #embedded
11. #collective
12. #which
13. #glasgow
14. #celtic
15. #rangers
16. #based
17. #rivalry
18. #football