b11 := (2,4)(3,5)(7,10)(8,11)(9,12)(13,19)(14,20)(16,21)(17,22)(18,23)(24,34)
     (25,30)(26,35)(28,36)(29,37)(31,38)(32,39)(33,40)(41,47)(42,44)(43,48)
     (45,49)(46,50)(51,53)(52,54);