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