b21 := (1,3,8,17,31,51,78,113,157,211,166)(2,6,14,27,46,72,106,149,202,121,167)
     (4,10,20,35,56,84,120,165,220,212,168)(5,12,24,42,67,100,142,194,85,122,
     169)(7,16,30,50,77,112,156,210,158,213,170)(9,19,34,55,83,119,164,219,
     203,123,171)(11,22,39,63,95,136,187,57,86,124,172)(13,26,45,71,105,148,
     201,114,159,214,173)(15,29,49,76,111,155,209,150,204,125,174)(18,33,54,
     82,118,163,218,195,87,126,175)(21,37,60,91,131,181,36,58,88,127,176)(23,
     41,66,99,141,193,79,115,160,215,177)(25,44,70,104,147,200,107,151,205,
     128,178)(28,48,75,110,154,208,143,196,89,129,179)(32,53,81,117,162,217,
     188,59,90,130,180)(38,62,94,135,186,52,80,116,161,216,182)(40,65,98,140,
     192,73,108,152,206,132,183)(43,69,103,146,199,101,144,197,92,133,184)(47,
     74,109,153,207,137,189,61,93,134,185)(64,97,139,191,68,102,145,198,96,
     138,190);