b21 := (1,2,5,3)(4,7,13,8)(6,10,18,11)(9,15,25,16)(12,20)(14,22,17,23)(19,28)
     (21,30)(24,32,37,33)(26,34,29,35)(27,36)(31,39,49,40)(38,46,50,47)(41,51,
     64,52)(42,53,67,54)(43,55,70,56)(44,57,73,58)(45,59,48,60)(61,77,104,78)
     (62,79,107,80)(63,74,98,81)(65,83,113,84)(66,85,116,86)(68,88,121,89)(69,
     90,122,91)(71,93,125,94)(72,95,128,96)(75,99,132,100)(76,101,135,102)(82,
     110,92,111)(87,118,97,119)(103,137,180,138)(105,139,182,140)(106,141,184,
     142)(108,131,172,143)(109,144,148,145)(112,146,183,147)(114,149,166,127)
     (115,150,190,151)(117,153,194,154)(120,155,195,156)(123,159,199,160)(124,
     161,200,162)(126,164,202,165)(129,168,205,169)(130,170,167,171)(133,173,
     208,174)(134,175,186,176)(136,177,207,178)(152,192,158,193)(157,197,163,
     185)(179,211,223,212)(181,213,196,214)(187,206)(188,215,204,216)(191,218,
     201,219)(198,220,209,221)(210,222,228,217)(224,229,230,232)(227,233);