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