U = 3 1 2  3 1 2  3 1 2  D = 1 2 3  1 2 3  1 2 3 
U = 3 2 1  1 2 3  3 2 1  D = 1 2 3  1 2 3  1 2 3 
U = 3 2 1  3 2 1  3 2 1  D = 1 2 3  1 2 3  1 2 3