subtraction_2digit_2digit_No21
subtraction_2digit_2digit_No22
subtraction_2digit_2digit_No23
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subtraction_2digit_2digit_No24
subtraction_2digit_2digit_No25
subtraction_2digit_2digit_No26
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subtraction_2digit_2digit_No27
subtraction_2digit_2digit_No28
subtraction_2digit_2digit_No29
subtraction_2digit_2digit_No30