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