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