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