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Percent evolution

I reached 70% with my lessons and after few days when I opened again the site I found the percent 67%. I repeated again the improving operation and the situation became the same. What happened? And what can I keep the percent evolution even if I don't make lessons for a while? Thank you

January 11, 2018

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Îmvață o limbă străină în numai 5 minute pe zi. Gratuit.