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