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