(0, 1): 0-1; 0-2-1; 0-3-1; 0-2-3-1
(0, 2): 0-2; 0-1-2; 0-3-2; 0-1-3-2
(0, 3): 0-3; 0-1-3; 0-2-3; 0-1-2-3
(1, 0): 1-0; 1-2-0; 1-3-0; 1-2-3-0
(1, 2): 1-2; 1-0-2; 1-3-2; 1-0-3-2
(1, 3): 1-3; 1-0-3; 1-2-3; 1-0-2-3
(2, 0): 2-0; 2-1-0; 2-3-0; 2-1-3-0
(2, 1): 2-1; 2-0-1; 2-3-1; 2-0-3-1
(2, 3): 2-3; 2-0-3; 2-1-3; 2-0-1-3
(3, 0): 3-0; 3-1-0; 3-2-0; 3-1-2-0
(3, 1): 3-1; 3-0-1; 3-2-1; 3-0-2-1
(3, 2): 3-2; 3-0-2; 3-1-2; 3-0-1-2
