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