n x n - n2, 2n - n - n, 2n - 3 - n - n - 3, 2( n - 3) - 2n - 6, 2( n + 3) - 2n + 6, n( n+ 1) - n2 + n, 2 + n - n + 2, n + n - 2n, 2n + n - 3n, 1 + n - n + 1,

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