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