Is duolingo completely free?

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Tags

1. #month
2. #available
3. #wrote
4. #language
5. #world
6. #duolingo
7. #subscribers
8. #lessons
9. #people
10. #millions
11. #users
12. #offers
13. #offline
14. #education
15. #around
16. #version
17. #remain
18. #access
19. #supported