b := ( 1,11,28)( 2,22,39)( 3,36,17)( 4,13,37)( 5,33,14)( 6,24,40)( 7,18,15)
( 8,30,29)( 9,34,19)(10,26,44)(12,38,25)(16,41,31)(20,42,21)(32,43,35);