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