b11 := (1,2)(3,5)(4,7)(9,13)(11,16)(12,17)(15,21)(18,24)(19,25)(20,27)(26,33)
     (28,36)(29,38)(30,40)(35,46)(37,49)(39,52)(41,55)(44,59)(47,63)(48,65)
     (50,68)(51,69)(53,72)(56,75)(57,77)(58,79)(61,83)(64,87)(66,90)(67,92)
     (70,94)(71,96)(73,99)(74,101)(76,104)(78,107)(81,111)(82,113)(85,109)(88,
     116)(91,120)(95,125)(97,128)(98,130)(100,133)(102,136)(106,117)(112,146)
     (114,148)(115,149)(118,151)(123,156)(126,160)(129,163)(132,167)(134,170)
     (135,171)(137,174)(139,177)(141,178)(153,185)(158,191)(161,195)(162,196)
     (165,199)(168,202)(172,206)(180,214)(181,216)(182,212)(183,219)(184,221)
     (187,223)(189,225)(190,227)(193,230)(197,233)(198,235)(201,237)(204,240)
     (205,242)(207,244)(209,211)(213,250)(217,254)(220,257)(226,260)(228,262)
     (231,265)(236,270)(241,268)(245,276)(248,273)(249,279)(251,282)(258,272)
     (267,285)(269,284)(271,295)(277,300)(278,301)(287,298)(288,309)(292,312)
     (296,316)(303,311)(305,323)(306,320)(313,324)(314,328)(317,332)(318,334)
     (330,337)(333,341)(338,343)(344,348);