b11 := (2,4)(3,6)(5,9)(7,12)(8,14)(10,17)(11,19)(13,21)(15,24)(16,26)(18,29)
     (20,31)(22,33)(23,35)(27,40)(28,42)(30,44)(32,47)(34,49)(36,39)(37,53)
     (38,54)(41,58)(43,60)(45,63)(46,64)(48,67)(50,68)(51,70)(52,71)(55,76)
     (56,77)(57,79)(59,80)(61,83)(62,84)(65,73)(69,85)(72,75)(74,82)(78,95)
     (86,99)(87,100)(88,101)(89,102)(90,103)(91,104)(94,105)(96,106)(97,107)
     (98,108)(109,114)(110,115)(113,116);