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