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