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