(1,1) -> (2,3)(2,3) -> (4,4)
(4,4) -> (3,2)
(3,2) -> (1,3)
(1,3) -> (3,4)
(3,4) -> (4,2)
(4,2) -> (2,1)
(2,1) -> (1,3)
(1,3) -> (3,1)
(3,1) -> (4,3)
(4,3) -> (2,4)
(2,4) -> (1,2)
(1,2) -> (3,3)
(3,3) -> (1,4)
(1,4) -> (2,2)
(2,2) -> (4,1)
(4,1) -> (1,1)