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