X ( 2 , 8 , 3 , 7 ) X ( 4 , 2 , 5 , 1 ) X ( 6 , 13 , 7 , 14 ) X ( 8 , 4 , 9 , 3 ) X ( 10 , 20 , 11 , 19 ) X ( 12 , 5 , 13 , 6 ) X ( 14 , 9 , 15 , 10 ) X ( 16 , 21 , 17 , 22 ) X ( 18 , 12 , 19 , 11 ) X ( 20 , 15 , 21 , 16 ) X ( 22 , 17 , 1 , 18 ) {\displaystyle X(2,8,3,7)X(4,2,5,1)X(6,13,7,14)X(8,4,9,3)X(10,20,11,19)X(12,5,13,6)X(14,9,15,10)X(16,21,17,22)X(18,12,19,11)X(20,15,21,16)X(22,17,1,18)}
