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