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