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