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