b21 := (2,3,4)(5,7,8)(6,9,10)(11,15,16)(12,17,18)(13,19,20)(14,21,22)(23,31,32)
     (25,33,34)(26,35,36)(27,37,38)(28,39,40)(29,41,42)(30,43,44)(45,59,56)
     (46,55,60)(47,61,62)(48,53,63)(49,64,58)(50,65,66)(51,67,68)(52,69,70)
     (54,71,72)(57,73,74)(75,84,78)(76,81,91)(77,92,93)(79,89,94)(80,95,86)
     (82,96,83)(85,97,98)(87,88,99)(90,100,101)(103,112,110)(104,106,113)(108,
     109,111);