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