b21 := (1,2,4,8,13,22,35,56,86,125,40)(3,6,11,18,29,47,73,72,108,104,148)(5,9,
     14,24,39,61,94,137,188,141,191)(7,12,20,31,51,78,113,154,19,30,49)(10,16,
     25,41,64,83,121,165,219,48,74)(15,17,27,43,68,103,135,184,243,314,109)
     (21,33,52,80,117,159,211,271,341,278,280)(23,37,57,88,129,176,232,295,
     283,200,202)(26,42,66,99,140,55,84,123,169,153,201)(28,45,69,105,97,118,
     160,212,273,170,224)(32,34,54,82,120,164,208,266,337,400,348)(36,38,59,
     90,133,182,240,308,383,430,259)(44,46,71,107,145,193,233,296,367,416,285)
     (50,76,110,149,196,181,239,306,379,386,388)(53,81,119,162,214,163,216,
     263,333,313,387)(58,89,131,178,235,299,370,342,344,218,279)(60,92,134,
     183,242,312,204,206,264,315,389)(62,63,96,139,190,250,322,231,293,363,
     225)(65,98,142,192,111,150,197,255,85,124,171)(67,101,144,174,228,289,
     358,409,334,246,248)(70,106,147,143,189,79,115,157,207,187,247)(75,77,
     112,152,199,249,320,392,287,354,404)(87,127,173,227,288,356,91,93,136,
     186,245)(95,138,114,155,203,261,305,378,265,335,398)(100,102,146,132,180,
     238,304,377,428,446,318)(116,158,209,267,338,223,284,352,151,198,257)
     (122,167,220,195,252,297,368,366,351,324,326)(126,128,175,230,291,362,
     415,442,453,405,390)(130,177,234,298,369,281,350,403,185,244,316)(156,
     205,262,241,310,384,166,168,222,256,327)(161,213,275,274,345,272,343,221,
     282,254,325)(172,226,286,194,179,236,300,372,336,399,436)(210,269,339,
     277,330,332,371,420,397,419,421)(215,217,260,331,374,423,395,434,449,401,
     346)(229,290,360,411,433,292,294,365,418,443,454)(237,302,373,422,444,
     455,364,417,349,251,253)(258,329,396,435,450,458,438,380,382,309,311)
     (268,270,340,276,347,402,393,432,357,407,437)(301,303,375,424,406,408,
     307,381,429,447,323)(317,391,431,448,457,461,439,425,427,353,355)(319,
     321,394,359,410,376,426,445,456,385,328)(361,413,440,451,459,462,412,414,
     441,452,460);