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