b11 := (1,2)(3,5)(4,7)(6,10)(8,13)(9,15)(11,18)(12,20)(14,23)(16,26)(17,28)(19,
     22)(21,32)(24,36)(25,37)(27,40)(29,43)(30,45)(31,47)(33,50)(34,52)(38,56)
     (39,58)(41,60)(42,61)(44,63)(46,66)(48,69)(49,71)(51,74)(53,76)(54,78)
     (55,80)(57,83)(59,86)(62,90)(64,93)(65,94)(67,97)(68,99)(72,104)(73,106)
     (75,109)(77,85)(79,114)(81,117)(82,118)(84,121)(87,124)(88,108)(89,127)
     (91,129)(95,133)(96,135)(98,137)(100,139)(101,141)(102,143)(103,144)(105,
     107)(110,151)(111,152)(112,154)(113,155)(115,157)(116,159)(119,122)(120,
     163)(123,166)(125,168)(126,169)(128,172)(130,174)(131,164)(132,176)(134,
     179)(136,180)(138,182)(140,142)(145,189)(146,191)(147,192)(148,194)(150,
     196)(153,193)(156,190)(160,202)(161,204)(162,205)(165,195)(167,201)(170,
     210)(171,211)(173,214)(175,207)(177,217)(178,219)(181,216)(183,184)(185,
     224)(186,222)(187,225)(188,227)(197,234)(198,235)(199,237)(200,239)(203,
     242)(206,215)(208,221)(209,213)(212,247)(220,243)(223,256)(226,246)(228,
     238)(229,262)(230,258)(231,263)(232,236)(240,267)(241,268)(244,270)(248,
     273)(249,275)(250,277)(251,279)(252,280)(253,282)(254,283)(255,278)(257,
     266)(259,264)(260,286)(261,288)(265,285)(269,284)(271,289)(272,291)(274,
     293)(276,290)(281,292)(287,296)(294,295);