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