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