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