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