31 - 14 = 17 - 17 + 14 = 31, 40 - 8 = 32 - 32 + 8 = 40, 26 - 12 = 14 - 12 + 14 = 26, 52 - 30 = 22 - 22 + 30 = 52, 16 + 14 = 30 - 30 - 16 = 14, 12 + 8 = 20 - 20 - 8 = 12, 25 - 13 = 12 - 13 + 12 = 25, 10 + 11 = 21 - 21 - 10 = 11, 50 - 13 = 37 - 37 + 13 = 50, 25 - 7 = 18 - 18 + 7 = 25,

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