(0,1)-(7) (2)-(1) (3)-(0) (4,7)-(5,6) (5)-(4) (6)-(2,3)
(0,1)-(7) (2)-(0) (3)-(4) (4,7)-(5,6) (5)-(1) (6)-(2,3)
(0,3)-(6,7) (1,2)-(4,5) (4)-(3) (5)-(0) (6)-(2) (7)-(1)
(0,3)-(6,7) (1,2)-(4,5) (4)-(1) (5)-(3) (6)-(2) (7)-(0)
