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