X ( 2 , 19 , 3 , 20 ) X ( 4 , 16 , 5 , 15 ) X ( 6 , 2 , 7 , 1 ) X ( 8 , 3 , 9 , 4 ) X ( 9 , 17 , 10 , 16 ) X ( 11 , 19 , 12 , 18 ) X ( 12 , 6 , 13 , 5 ) X ( 14 , 21 , 15 , 22 ) X ( 17 , 11 , 18 , 10 ) X ( 20 , 8 , 21 , 7 ) X ( 22 , 13 , 1 , 14 ) {\displaystyle X(2,19,3,20)X(4,16,5,15)X(6,2,7,1)X(8,3,9,4)X(9,17,10,16)X(11,19,12,18)X(12,6,13,5)X(14,21,15,22)X(17,11,18,10)X(20,8,21,7)X(22,13,1,14)}
