z1 := (1,3,4)(2,5,6)(7,11,9)(8,12,13)(10,14,15)(16,21,22)(17,23,24)(18,25,26)
     (19,27,28)(20,29,30)(31,37,38)(32,39,40)(33,41,42)(34,43,44)(35,45,46)
     (47,52,50)(48,49,53)(51,54,55);