19 - 2 = - 17, 17 - 3 =  - 14, 15 - 4 = - 11, 11 - 6 = - 5, 12 - 5 = - 7, 18 - 8 =  - 10, 14 - 6 =  - 8, 13 - 9 = - 4, 10 - 4 = - 6, 16 - 7 =  - 9,

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