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