1/2 of 2 = - 1, 1/2 of 4 = - 2, 1/2 of 6 = - 3, 1/2 of 8 = - 4, 1/2 of 10 = - 5, 1/2 of 12 = - 6, 1/2 of 14 = - 7, 1/2 of 16 = - 8, 1/2 of 18 = - 9, 1/2 of 20 = - 10, 1/2 of 22 = - 11, 1/2 of 24 = - 12,

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