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