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