z1 := (1,3,4)(2,5,6)(7,11,12)(8,13,14)(9,15,16)(10,17,18)(19,25,26)(20,27,28)
     (21,29,30)(22,31,32)(23,33,34)(24,35,36)(37,49,40)(38,50,51)(39,52,53)
     (41,54,55)(42,56,57)(43,58,59)(44,60,61)(45,62,63)(46,64,65)(47,66,67)
     (48,68,69)(70,77,78)(71,79,80)(72,74,73)(75,81,82)(76,83,84);