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