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This is a calculation training application for early elementary school years,
a time trial of simple calculations composed of single digits:
Add(no carry/with carry), subtract(no carry/with carry), multiply(1x/2x/.../9x) and divide.
Calculation time records and numbers of miscalculations are stored in personal databases, and you can check the records and miscalculations later.
[Ver.1.2.3]
Fixed shutdown problem caused by SQLiteException.
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