a11 := (1,2)(3,5)(4,7)(6,9)(8,12)(10,15)(11,17)(13,20)(14,22)(16,25)(21,31)(26,
     37)(27,38)(28,40)(29,32)(33,46)(34,48)(36,51)(41,57)(42,59)(43,61)(45,64)
     (47,66)(49,69)(50,71)(52,74)(53,76)(54,78)(55,80)(58,84)(60,86)(62,89)
     (67,95)(68,97)(70,100)(72,90)(73,104)(75,91)(77,108)(79,110)(81,113)(82,
     115)(85,119)(87,121)(92,126)(93,127)(96,130)(101,136)(102,137)(103,139)
     (107,143)(111,148)(114,152)(116,155)(118,140)(123,161)(125,156)(128,167)
     (131,171)(132,173)(133,175)(135,176)(141,180)(147,187)(149,190)(150,192)
     (153,195)(157,198)(159,200)(162,204)(164,206)(165,208)(166,210)(168,213)
     (169,215)(172,218)(174,220)(177,201)(178,223)(179,225)(181,227)(183,230)
     (184,221)(186,233)(193,241)(199,242)(216,259)(222,260)(224,265)(235,271)
     (237,274)(238,269)(244,279)(248,281)(249,283)(250,270)(251,284)(252,282)
     (253,278)(255,288)(256,266)(262,293)(267,298)(272,303)(277,305)(280,309)
     (291,316)(292,311)(296,306)(300,323)(302,324)(307,317)(313,336)(315,338)
     (319,341)(321,343)(325,348)(326,350)(327,352)(330,354)(331,355)(333,349)
     (334,356)(337,358)(353,361)(362,371);