b11 := (1,2)(3,4)(5,7)(6,8)(9,12)(10,13)(11,15)(14,19)(16,21)(17,22)(18,24)(20,
     27)(23,31)(25,33)(26,34)(28,37)(29,38)(30,40)(32,43)(35,47)(36,48)(39,51)
     (41,53)(42,54)(44,57)(45,58)(46,60)(49,63)(50,64)(52,67)(55,71)(56,72)
     (59,76)(61,78)(62,79)(66,82)(68,85)(69,86)(70,88)(73,92)(75,94)(77,97)
     (80,101)(81,102)(83,105)(84,106)(87,110)(89,112)(90,113)(91,115)(93,118)
     (95,120)(96,121)(98,123)(99,109)(100,125)(103,129)(104,130)(107,133)(108,
     134)(111,137)(114,140)(116,142)(117,128)(119,144)(122,147)(124,149)(126,
     139)(131,153)(132,154)(135,158)(136,159)(138,161)(141,164)(143,167)(145,
     170)(146,172)(148,175)(150,177)(151,178)(152,179)(157,183)(160,187)(162,
     189)(163,190)(165,168)(166,193)(169,195)(171,196)(174,197)(176,192)(180,
     204)(181,201)(182,206)(188,209)(191,213)(194,216)(198,221)(199,222)(200,
     208)(202,225)(203,227)(205,230)(207,232)(210,218)(211,233)(212,235)(215,
     236)(217,238)(219,240)(220,241)(223,244)(224,245)(226,247)(228,249)(229,
     250)(231,252)(234,255)(237,257)(239,242)(243,259)(246,261)(248,264)(253,
     267)(254,268)(256,269)(258,266)(260,270)(262,271)(263,265)(272,274)(273,
     275);