What is the difference between Paris RER and Metro?

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Tags

1. #disneyland
2. #airports
3. #stations
4. #network
5. #express
6. #ensure
7. #metro
8. #nearby
9. #suburbs
10. #gaulle
11. #charles
12. #never
13. #regional
14. #paris
15. #serves
16. #entrance
17. #travel
18. #versailles
19. #served
20. #while