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