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