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