3 - 2 = 1, 4 - 3 = 1, 5 - 4 = 1, 6 - 5 = 1, 7 - 6 = 1, 8 - 7 = 1, 9 - 8 = 1, 10 - 9 = 1, 2 - 1 = 1,

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