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