b11 := (1,2)(4,6)(5,8)(7,10)(11,14)(12,16)(13,17)(15,20)(18,23)(19,24)(22,25)
     (26,28)(27,29)(30,32)(31,34)(33,37)(35,39)(36,40)(38,43)(41,46)(42,47)
     (44,48)(45,49)(50,54)(51,56)(52,58)(53,60)(55,63)(57,65)(59,67)(61,69)
     (62,70)(64,73)(66,76)(68,79)(71,83)(72,84)(74,85)(75,86)(77,89)(78,90)
     (80,91)(81,92)(82,93)(87,88)(94,104)(95,105)(96,107)(97,109)(98,111)(99,
     113)(100,114)(101,116)(102,118)(103,120)(106,122)(108,124)(110,126)(112,
     128)(115,130)(117,132)(119,134)(121,136)(123,139)(125,142)(127,145)(129,
     148)(131,150)(133,153)(135,156)(137,147)(138,159)(140,160)(141,161)(143,
     164)(144,165)(146,166)(149,169)(152,170)(154,173)(157,174)(158,175)(162,
     163)(167,183)(168,184)(171,172)(176,190)(177,191)(178,193)(179,195)(180,
     196)(181,198)(182,200)(185,202)(186,203)(187,205)(188,206)(189,207)(192,
     211)(194,213)(197,216)(199,218)(201,220)(204,222)(208,221)(209,225)(210,
     227)(212,230)(214,233)(215,235)(217,238)(219,241)(223,246)(224,248)(226,
     251)(228,240)(229,253)(231,254)(232,255)(234,258)(236,260)(237,261)(239,
     262)(242,252)(243,265)(244,267)(245,268)(247,271)(249,273)(250,274)(256,
     279)(263,264)(266,284)(269,287)(275,289)(277,290)(278,291)(280,292)(281,
     294)(283,295)(285,297)(286,299)(288,300)(293,304)(296,306)(298,308)(301,
     307)(302,309)(303,310)(305,313);