3 + 2 = 5 - 5 - 2 = 3, 6 + 3 = 9 - 3 + 6 = 9, 10 + 5 = 15 - 15 - 5 = 10, 12 - 4 = 8 - 8 + 4 = 12, 5 + 6 = 11 - 11 - 6 = 5, 13 - 6 = 7 - 7 + 6 = 13, 2 + 18 = 20 - 20 - 18 = 2, 7 + 7 = 14 - 14- 7 = 7, 17 - 6 = 11 - 11 + 6 = 17, 5 + 4 = 9 - 9 - 4 = 5, 14 - 6 = 8 - 6 + 8 = 14, 7 + 8 = 15 - 15 - 7 = 8, 20 - 16 = 4 - 16 + 4 = 20,

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