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

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