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