b11 := (1,2)(3,5)(4,7)(6,10)(8,13)(9,15)(11,18)(12,20)(14,23)(19,28)(21,29)(22,
     31)(24,34)(25,36)(27,39)(32,45)(33,47)(35,50)(37,41)(38,52)(40,55)(42,43)
     (44,59)(46,62)(48,65)(53,69)(54,70)(57,58)(60,77)(61,79)(63,81)(66,84)
     (67,86)(68,88)(71,83)(72,91)(75,82)(87,96)(89,102)(90,104)(92,107)(93,99)
     (94,109)(95,111)(98,114)(101,117)(103,120)(105,123)(106,124)(108,115)
     (110,127)(116,133)(121,125)(126,136)(128,130)(129,139)(131,141)(142,149)
     (144,151)(146,153)(147,155)(150,158)(152,159)(156,161);