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![How to reset Casio fx-991ES Plus - Calculator tricks [Examination - 2020] - YouTube](https://i.ytimg.com/vi/HPYKojvWINo/maxresdefault.jpg "How to reset Casio fx-991ES Plus - Calculator tricks [Examination - 2020] - YouTube")
How to reset Casio fx-991ES Plus - Calculator tricks [Examination - 2020] - YouTube
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