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