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