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