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