b21 := (1,2,5,11,24,33,17,7,3)(4,8,19,37,66,53,29,15,9)(6,13,28,51,86,54,30,16,
     14)(10,21,41,72,113,116,74,42,22)(12,26,49,84,129,130,85,50,27)(18,34,61,
     98,131,87,52,62,35)(20,38,67,105,152,157,107,68,39)(23,43,76,120,172,174,
     121,77,44)(25,47,82,127,181,182,128,83,48)(31,55,89,104,150,188,137,91,
     56)(32,57,92,106,154,189,138,93,58)(36,63,99,144,196,166,145,100,64)(40,
     69,108,158,135,90,134,109,70)(45,78,123,177,230,231,178,124,79)(46,80,
     125,179,232,233,180,126,81)(59,94,139,190,240,244,193,141,95)(60,96,142,
     194,245,246,195,143,97)(65,101,146,199,225,249,200,147,102)(71,110,159,
     214,259,266,215,160,111)(73,114,164,220,270,273,221,165,115)(75,117,167,
     191,140,122,175,168,118)(88,132,183,234,203,251,235,184,133)(103,148,201,
     229,278,287,250,202,149)(112,161,216,267,302,286,243,217,162)(119,169,
     222,274,291,285,242,192,170)(136,185,176,228,277,252,280,236,186)(151,
     204,253,260,210,155,198,248,205)(153,208,258,261,211,156,197,247,209)
     (163,218,268,304,283,239,282,269,219)(171,223,275,310,281,238,187,237,
     224)(173,226,241,284,279,315,312,276,227)(206,254,292,303,271,289,317,
     293,255)(207,256,294,301,272,288,316,295,257)(212,262,297,323,314,305,
     325,298,263)(213,264,299,326,313,306,327,300,265)(290,318,322,296,321,
     320,330,324,319)(307,329,311)(308,328,309);