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Book: Best challenges of sololearn

If you would write a book about the best challenges of sololearn: Which challenges must find their place in it? If I ever write that book, I promise, it is open source !!!

15th Nov 2017, 8:50 AM
Oma Falk
Oma Falk - avatar
1 Resposta
15th Nov 2017, 11:46 AM
qwerty
qwerty - avatar