b11 := (1,2)(3,5)(4,7)(6,10)(8,12)(9,13)(11,16)(14,19)(15,20)(17,23)(18,24)(21,
     28)(22,29)(25,26)(27,34)(30,38)(31,39)(32,41)(33,43)(35,45)(36,46)(37,47)
     (40,51)(42,53)(44,55)(48,59)(49,60)(50,62)(52,65)(54,68)(56,69)(57,70)
     (58,72)(61,76)(63,78)(64,79)(67,80)(71,85)(74,86)(75,87)(77,90)(81,95)
     (82,96)(83,98)(84,100)(88,102)(89,103)(91,104)(92,105)(93,107)(94,108)
     (97,111)(99,113)(106,119)(109,121)(110,122)(112,124)(114,127)(115,126)
     (116,130)(117,132)(118,134)(120,137)(123,141)(125,144)(128,145)(129,146)
     (131,148)(133,150)(136,152)(138,153)(139,154)(140,156)(142,143)(147,162)
     (149,165)(151,168)(155,173)(157,175)(158,176)(159,178)(160,179)(161,181)
     (164,182)(166,185)(169,186)(170,187)(171,189)(172,191)(174,194)(180,200)
     (183,184)(188,205)(190,207)(192,208)(195,209)(196,199)(197,210)(201,214)
     (202,216)(203,217)(204,218)(206,220)(211,212)(213,225)(215,226)(219,229)
     (221,232)(222,233)(223,234)(224,235)(227,239)(228,241)(230,231)(236,247)
     (237,248)(238,250)(240,253)(242,255)(243,256)(244,258)(245,259)(246,261)
     (249,264)(251,265)(252,266)(254,268)(257,270)(260,267)(262,272)(263,273)
     (269,276)(271,275)(277,278);