a21 := (1,86,13,10,47)(2,53,30,8,38)(3,40,48,25,17)(4,29,92,88,43)(5,98,66,54,
     65)(6,27,51,73,24)(7,83,16,20,28)(9,23,89,95,61)(11,42,46,91,32)(12,14,
     81,55,68)(15,90,31,56,37)(18,69,45,84,76)(19,59,79,35,93)(21,22,64,39,
     100)(26,58,96,85,77)(33,52,94,75,44)(34,62,87,78,50)(36,82,60,74,72)(41,
     80,70,49,67)(57,63,71,99,97);