Kaso A. Thourcans
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It's just what it says, generates a pattern based on the setting that you want, min and max length and the grind size, then let's you practice that pattern, it shows you the way to solve that pattern and tells you if you did it fine or not. There aren't bugs and it's easy to use, it's very light so you don't need too many space in your phone. May be it'll not be too much time in your phone 'cause of the limited uses that it has.
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