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