b11 := (1,2)(3,4)(5,7)(6,8)(10,13)(11,15)(12,17)(16,21)(18,24)(19,26)(20,27)
     (22,30)(23,31)(25,34)(28,38)(29,40)(32,43)(33,45)(35,48)(36,49)(39,53)
     (41,55)(42,57)(44,60)(46,52)(47,62)(50,64)(51,66)(54,59)(56,61)(58,74)
     (63,75)(65,77)(67,79)(68,76)(69,80)(71,83)(72,85)(73,86)(78,90)(81,94)
     (84,97)(87,101)(88,103)(89,104)(91,106)(92,107)(93,109)(95,111)(96,112)
     (98,115)(99,116)(100,118)(102,120)(108,124)(110,127)(113,130)(114,132)
     (117,134)(119,137)(121,128)(122,123)(125,139)(126,136)(129,141)(131,142)
     (133,143)(135,144);