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