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