M 3 x n 1

M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1
M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1
M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1M 3 x n 1