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