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