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