z1 := (1,2)(3,5)(4,7)(6,10)(8,13)(9,15)(11,18)(12,20)(14,23)(16,21)(17,27)(19,
     30)(22,33)(24,36)(25,38)(28,41)(29,43)(31,46)(32,47)(34,50)(35,52)(37,55)
     (39,58)(40,60)(44,65)(45,67)(48,54)(49,72)(51,66)(53,77)(56,81)(59,84)
     (61,87)(62,89)(63,90)(64,92)(68,95)(69,96)(70,98)(71,99)(73,102)(74,94)
     (75,104)(76,106)(78,109)(79,110)(80,112)(82,115)(83,116)(86,120)(88,123)
     (91,126)(93,129)(97,111)(100,135)(101,137)(103,139)(105,142)(107,145)
     (108,147)(113,152)(114,131)(117,125)(118,141)(119,158)(122,160)(124,153)
     (127,166)(132,169)(133,170)(134,172)(136,173)(138,143)(144,182)(146,185)
     (148,187)(149,189)(150,190)(151,192)(154,178)(155,194)(156,195)(157,197)
     (159,200)(162,202)(163,204)(164,205)(165,207)(168,210)(174,218)(175,220)
     (176,221)(177,223)(179,224)(180,226)(181,211)(183,229)(184,231)(186,232)
     (188,193)(199,209)(201,242)(203,206)(208,249)(212,245)(213,233)(214,251)
     (215,253)(216,254)(217,255)(219,258)(222,225)(227,241)(228,263)(234,239)
     (235,268)(236,269)(237,270)(238,261)(240,272)(243,274)(244,276)(246,262)
     (247,278)(248,256)(250,279)(252,280)(257,284)(259,285)(260,287)(264,289)
     (265,291)(266,292)(271,297)(273,299)(275,301)(277,303)(281,308)(282,307)
     (290,313)(295,318)(296,312)(304,306)(305,309)(310,321)(311,324)(314,325)
     (315,319)(316,326)(317,327)(322,329)(328,330);