z1 := (1,2,3)(4,6,7)(5,8,9)(10,14,15)(11,16,17)(12,18,19)(13,20,21)(22,25,28)
     (23,24,29)(26,30,31)(27,32,33)(34,39,38)(35,40,37)(36,41,42)(43,47,45)
     (44,48,46);