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