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