z1 := (2,4)(3,6)(5,9)(7,11)(8,13)(10,16)(12,15)(14,21)(17,25)(18,27)(19,28)
     (20,30)(22,33)(23,34)(24,36)(26,39)(29,32)(31,46)(35,52)(37,53)(38,55)
     (40,58)(41,59)(42,60)(43,62)(44,63)(45,65)(47,68)(48,69)(49,71)(50,72)
     (51,74)(54,78)(56,81)(57,83)(61,90)(64,67)(66,95)(70,100)(73,105)(75,107)
     (76,85)(79,111)(80,112)(82,114)(84,117)(86,119)(87,103)(88,121)(89,98)
     (91,125)(92,97)(93,127)(94,129)(96,132)(99,134)(101,136)(102,138)(106,
     141)(108,144)(109,145)(110,146)(113,149)(115,152)(116,154)(118,157)(120,
     159)(122,162)(123,163)(124,165)(126,137)(128,131)(130,171)(133,175)(135,
     178)(139,183)(140,184)(142,187)(143,189)(147,195)(148,197)(150,200)(151,
     202)(153,192)(155,207)(156,209)(158,212)(160,173)(161,215)(164,217)(166,
     218)(167,221)(168,222)(169,224)(170,225)(172,174)(176,210)(177,229)(179,
     232)(180,234)(181,235)(182,227)(185,239)(186,241)(188,238)(190,245)(191,
     246)(193,247)(194,249)(196,252)(198,204)(201,254)(203,257)(205,259)(206,
     261)(208,264)(211,267)(213,268)(214,269)(216,270)(219,273)(220,274)(223,
     279)(228,282)(230,284)(231,286)(233,289)(236,258)(237,292)(240,295)(242,
     296)(243,285)(244,298)(248,299)(250,306)(251,308)(253,309)(255,312)(256,
     314)(260,319)(262,322)(263,271)(265,323)(266,324)(272,330)(275,335)(276,
     293)(277,281)(280,290)(283,341)(287,346)(288,310)(291,311)(294,349)(297,
     353)(300,303)(302,357)(304,359)(305,360)(307,363)(313,343)(315,371)(316,
     373)(317,374)(318,376)(320,377)(321,379)(325,380)(326,333)(327,338)(328,
     382)(329,383)(331,385)(332,386)(334,362)(336,389)(337,390)(339,391)(340,
     393)(342,344)(347,400)(350,401)(351,396)(352,403)(354,406)(355,408)(356,
     409)(358,378)(361,414)(364,418)(366,420)(367,421)(368,381)(369,395)(370,
     399)(375,423)(384,430)(387,404)(388,429)(392,440)(394,443)(397,445)(398,
     424)(402,448)(405,452)(407,455)(410,435)(411,459)(412,460)(413,462)(415,
     464)(416,442)(417,466)(422,469)(425,470)(426,471)(427,473)(428,474)(431,
     476)(432,478)(433,434)(437,480)(438,456)(441,484)(444,467)(449,488)(450,
     489)(451,487)(453,481)(454,485)(457,494)(461,496)(465,498)(472,495)(475,
     506)(477,508)(479,507)(482,501)(483,511)(486,512)(492,505)(493,515)(497,
     500)(499,516)(503,504)(509,521)(510,522)(513,520)(514,524)(518,519);