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