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