b11 := (2,4)(3,5)(6,10)(7,11)(8,12)(13,19)(14,20)(15,21)(17,22)(18,23)(24,34)
     (25,35)(26,36)(27,37)(28,38)(29,39)(31,40)(32,41)(33,42)(43,61)(45,62)
     (46,63)(47,64)(48,65)(49,66)(50,67)(51,68)(52,69)(53,70)(54,71)(55,72)
     (56,73)(57,74)(58,75)(59,76)(60,77)(78,106)(79,107)(80,108)(81,109)(82,
     110)(83,111)(84,86)(85,112)(87,113)(88,114)(89,115)(90,99)(92,116)(93,
     117)(94,96)(95,118)(97,119)(98,120)(100,121)(101,122)(102,123)(103,124)
     (105,125)(126,147)(127,151)(128,149)(129,152)(130,136)(131,148)(132,150)
     (133,144)(134,153)(135,140)(137,146)(139,154)(142,155)(143,156)(145,157)
     (158,165)(159,168)(160,169)(163,166)(164,170)(167,171);