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