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Tree differences between accounts

Me and my friend started an account together, however we noticed the Skill Tree is completely different by order and number of lessons in each skill. How come? It seems we are also learning different words...

April 7, 2013

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It seems that you and your friend got into different test groups. Duolingo developers use this practice to blind test different approaches. After some time the system proved most effective is rolled out for everyone.

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