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