Does duolingo work for Japanese?

Related questions

1. Should I study Japanese or Chinese?
2. Are you fluent after completing duolingo?
3. What's harder Korean or Japanese?
4. Is it easier to learn Korean If you know Japanese?
5. Can Japanese understand Korean?
6. Is Korean easy to read?
7. Is it easier to learn Japanese if you know Chinese?
8. Is Korean more useful than Japanese?
9. Is English hard to learn for Japanese?
10. How long does it take to be fluent in Spanish?

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