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