z1 := (1,2)(3,5)(4,7)(6,11)(8,16)(9,14)(10,18)(12,22)(13,23)(15,27)(17,30)(19,
     34)(20,35)(21,37)(24,44)(25,42)(26,46)(28,50)(29,51)(31,55)(32,48)(33,41)
     (36,62)(38,64)(39,65)(40,67)(43,71)(45,74)(47,77)(49,79)(52,86)(53,84)
     (54,88)(56,92)(57,93)(58,94)(59,95)(60,97)(61,99)(63,103)(66,109)(68,112)
     (69,113)(70,114)(72,117)(73,118)(75,122)(76,116)(78,126)(80,128)(81,129)
     (82,131)(83,133)(85,137)(87,140)(89,144)(90,145)(91,147)(96,157)(98,160)
     (100,162)(101,163)(102,165)(104,168)(105,169)(106,171)(107,173)(108,175)
     (110,179)(111,181)(115,142)(119,188)(120,187)(121,190)(123,193)(124,194)
     (125,196)(127,135)(130,200)(132,202)(134,203)(136,205)(138,208)(139,209)
     (141,211)(143,214)(146,217)(148,219)(149,220)(150,221)(151,223)(152,186)
     (153,226)(154,199)(155,218)(156,167)(158,207)(159,161)(164,235)(166,236)
     (170,239)(172,240)(174,241)(176,242)(177,243)(178,244)(180,245)(182,246)
     (183,247)(184,248)(185,249)(189,250)(191,252)(192,229)(195,256)(197,254)
     (198,257)(201,231)(204,261)(206,234)(210,260)(212,265)(213,266)(215,238)
     (216,255)(222,270)(224,271)(225,267)(227,272)(228,262)(230,258)(232,251)
     (233,273)(237,274)(253,278)(259,280)(263,281)(264,279)(268,282)(269,277)
     (275,284)(276,283)(285,287)(286,288);