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

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