5 - 2 = - 3, 9 - 1 =  - 8, 4 - 0 = - 4, 9 - 2 = - 7, 10 - 5 = - 5, 2 - 1 = - 1, 8 - 8 = - 0, 10 - 1 = - 9, 9 - 3 = - 6, 3 - 1 = - 2,

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