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