2 x 1 =  - 2, 2 X 2 =  - 4, 2 X 3 = - 6, 2 X 4 = - 8, 2 X 5 = - 10, 2 X 6 = - 12, 2 X7 = - 14, 2 X 8= - 16, 2 X 9 = - 18, 2 X 10 = - 20, 2 X 11 = - 22,

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