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 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 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