z1 := (2,4)(3,6)(5,10)(7,14)(8,15)(9,17)(12,21)(13,23)(16,28)(18,32)(19,33)
     (20,35)(22,39)(24,42)(25,43)(26,45)(27,47)(29,50)(30,51)(31,53)(34,59)
     (36,37)(38,64)(40,68)(41,69)(44,74)(46,77)(48,81)(49,82)(52,88)(54,92)
     (55,93)(57,96)(58,98)(60,102)(61,103)(62,104)(63,106)(65,72)(66,110)(67,
     112)(70,117)(71,118)(73,121)(75,123)(76,124)(78,128)(79,129)(80,131)(84,
     134)(85,127)(86,136)(90,140)(91,142)(94,147)(95,149)(97,151)(99,154)(101,
     156)(105,161)(109,163)(111,165)(113,168)(114,162)(115,122)(116,170)(120,
     174)(125,177)(132,137)(133,138)(135,186)(139,172)(141,190)(143,193)(144,
     195)(145,155)(146,198)(148,202)(150,204)(157,208)(158,209)(159,210)(160,
     181)(166,213)(167,214)(169,180)(173,189)(175,218)(176,220)(178,223)(179,
     187)(182,225)(183,226)(184,228)(188,230)(191,232)(192,215)(194,237)(196,
     229)(199,242)(205,246)(206,248)(207,224)(211,239)(212,254)(216,245)(217,
     247)(219,257)(221,259)(233,262)(234,264)(236,266)(238,269)(240,258)(249,
     271)(253,256)(255,267)(263,273)(268,270)(272,274);