b11 := (2,4)(5,7)(6,8)(9,13)(10,14)(11,15)(12,16)(17,25)(18,26)(19,27)(20,28)
     (21,29)(22,30)(23,31)(24,32)(33,49)(34,50)(35,51)(36,52)(37,53)(38,54)
     (39,55)(40,56)(41,57)(42,58)(43,59)(44,60)(45,61)(46,62)(47,63)(48,64)
     (65,94)(66,95)(68,84)(69,96)(70,97)(71,83)(72,98)(74,99)(75,91)(76,88)
     (77,82)(78,100)(79,101)(80,102)(81,103)(85,104)(87,105)(89,106)(90,107)
     (92,108)(93,109)(110,139)(111,137)(112,118)(113,140)(114,134)(115,141)
     (116,142)(117,143)(119,144)(120,145)(122,146)(123,126)(124,147)(125,148)
     (127,149)(129,150)(130,151)(131,136)(132,152)(133,153)(135,154)(138,155)
     (156,167)(157,168)(159,169)(160,161)(162,170)(163,171)(164,172)(165,173)
     (174,180)(175,186)(176,187)(177,178)(179,182)(181,188)(183,185)(184,189);