0 x0 = - 0, 1 x 1 =  - 1, 2 x 2 = - 4, 3 x 3= - 9, 4 x 4 = - 16, 5 x 5 = - 25, 6 x 6 = - 36, 7 x 7 = - 49, 8 x 8 = - 64, 9 x 9= - 81,

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