10 + 5 =  - 15, 6 +3 =  - 9, 28 + 11 = - 39, 12 + 18 = - 30, 12 + 4 = - 16, 13 + 13 = - 26, 7 + 6 = - 13, 15 + 7 = - 22, 13 + 4 = - 17, 15 + 12 =  - 27, 16 + 9 = - 25, 26 + 6 = - 32, 24 + 12 = - 36, 16 + 8 = - 24, 19 + 18 = - 37, 33 + 5 = - 38, 15 + 14 = - 29, 30 + 19 = - 49, 35 + 6 = - 41, 38 + 8 - 46,

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