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1 x n 1 3

1 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 3
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1 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 31 x n 1 3