X ( 1 , 9 , 2 , 8 ) X ( 3 , 11 , 4 , 10 ) X ( 5 , 13 , 6 , 12 ) X ( 7 , 1 , 8 , 14 ) X ( 9 , 3 , 10 , 2 ) X ( 11 , 5 , 12 , 4 ) X ( 13 , 7 , 14 , 6 ) {\displaystyle X(1,9,2,8)X(3,11,4,10)X(5,13,6,12)X(7,1,8,14)X(9,3,10,2)X(11,5,12,4)X(13,7,14,6)}