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