10 + 3 = 13, 10 + 5 = 15, 10 - 3 = 13, , 10 + 8 = 18, 10 - 7 = 17, 10 + 7 = 17, , 10 - 2 = 8, 10 + 8 = 18, 10 + 3 = 13, , 10 + 1 = 11, 10 + 11 = 20, 10 + 10 = 20, , 10 + 1 = 11, 10 - 1 = 9, 10 + 2 = 11, , 10 + 6 = 16, 10 + 5 = 15, 10 - 4 = 6, , 10 + 9 = 19, 10 + 4 = 14, 10 - 4 = 14.

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