z1 := (1,2)(3,7)(4,6)(5,10)(8,15)(9,12)(11,20)(13,18)(14,24)(16,21)(17,22)(19,
     28)(23,27)(25,29)(26,33)(30,36)(31,34)(32,38)(35,43)(37,42)(39,50)(40,52)
     (41,46)(44,58)(45,60)(47,63)(48,56)(49,57)(51,59)(53,70)(54,62)(55,73)
     (61,78)(64,69)(65,74)(66,75)(67,83)(68,77)(71,79)(72,81)(76,88)(80,86)
     (82,92)(84,96)(85,98)(87,101)(89,105)(90,106)(91,107)(93,102)(94,103)(95,
     104)(97,114)(99,116)(100,117)(108,118)(109,119)(110,120)(111,121)(112,
     122)(115,124)(125,126);