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