b := ( 1,23,13)( 2,16, 6)( 3,33,20)( 4,29,22)( 5,53,41)( 7,52,25)( 8,31,11)
( 9,48,26)(10,43,15)(12,39,54)(14,38,19)(17,27,42)(18,50,21)(24,40,28)
(30,34,45)(32,37,46)(35,44,49)(36,47,51);