Waw, very awesome,,, i think not all of people have like ms @mariska.lubis have like that hobby and can do it. And i don't like playing about number, because my matematich is not so good. But i like very much about read a book anytime and anywere...
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reading with math will give you a lot more to read... ;)
Thank you for Motivation ms @mariska.lubis... I will try it.