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