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