b11 := (2,4)(3,5)(6,8)(7,9)(10,14)(12,15)(13,16)(17,23)(18,24)(20,25)(21,26)
     (22,27)(28,35)(29,36)(30,37)(31,38)(32,39)(33,40)(34,41)(42,48)(43,51)
     (44,52)(45,53)(46,50)(49,54)(55,57);