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