a11 := (2,3)(4,6)(5,8)(11,15)(13,17)(14,19)(16,22)(24,30)(27,31)(28,34)(33,38)
     (36,42)(37,41)(39,46)(43,47)(44,51)(48,54)(49,55)(50,57)(52,60)(53,62)
     (56,66)(58,69)(59,70)(63,75)(64,76)(65,78)(67,81)(68,83)(71,84)(73,86)
     (74,88)(77,89)(79,94)(80,96)(87,103)(91,106)(99,114)(100,112)(101,113)
     (102,118)(115,125)(116,130)(117,121)(120,128)(126,137)(127,136)(129,140)
     (131,143)(132,134)(133,135)(138,147)(139,148)(141,149)(142,150)(146,151);