How do I buy Metro tickets in Amsterdam?

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Tags

1. #chipkaart
2. #machines
3. #board
4. #rather
5. #metro
6. #trams
7. #single
8. #actually
9. #station
10. #these
11. #travel
12. #around
13. #compared
14. #amsterdam
15. #journey
16. #ticket
17. #tickets
18. #expensive
19. #however