z1 := (2,4)(3,5)(6,10)(7,11)(8,12)(9,13)(14,22)(15,23)(16,24)(17,25)(18,26)
     (19,27)(20,28)(29,40)(30,41)(32,42)(33,43)(34,37)(35,44)(36,45)(38,46)
     (39,47)(49,60)(50,61)(51,52)(53,62)(54,63)(55,57)(58,64)(59,65)(66,75)
     (67,76)(68,77)(69,78)(70,79)(71,80)(72,81)(73,82)(74,83)(84,100)(85,101)
     (87,102)(89,103)(90,104)(91,105)(92,106)(93,107)(94,108)(95,109)(97,110)
     (98,111)(99,112)(113,130)(114,131)(115,132)(116,133)(117,134)(118,135)
     (119,136)(120,137)(121,138)(122,123)(124,139)(125,128)(126,140)(127,141)
     (129,142)(143,165)(144,158)(145,166)(146,167)(147,168)(148,149)(150,169)
     (151,170)(152,171)(153,155)(156,172)(157,173)(159,174)(161,162)(164,175)
     (176,190)(177,184)(178,191)(179,192)(180,181)(182,193)(183,194)(185,195)
     (186,196)(188,197)(198,205)(199,202)(204,206)(207,208);