z1 := (2,3)(4,6)(5,8)(7,12)(9,16)(10,17)(11,19)(14,23)(15,25)(18,31)(20,35)
     (21,36)(22,30)(24,41)(26,45)(27,46)(28,48)(29,50)(32,55)(34,56)(37,61)
     (38,63)(42,68)(43,69)(44,71)(47,77)(49,81)(51,84)(52,86)(53,87)(54,88)
     (58,94)(59,96)(60,98)(62,102)(65,106)(66,107)(67,109)(70,115)(72,119)(73,
     120)(74,122)(75,124)(76,125)(78,127)(79,128)(80,130)(82,134)(83,136)(85,
     140)(89,147)(90,149)(92,152)(93,154)(95,158)(97,161)(99,165)(100,166)
     (101,168)(103,172)(104,173)(105,175)(108,180)(110,184)(111,185)(112,181)
     (113,186)(114,188)(116,171)(117,192)(118,193)(123,201)(126,206)(129,209)
     (131,213)(132,214)(133,215)(135,217)(137,221)(138,222)(139,224)(141,228)
     (142,230)(143,232)(144,234)(145,236)(146,238)(148,242)(150,245)(151,246)
     (153,249)(155,251)(156,227)(157,252)(159,255)(160,257)(162,261)(164,262)
     (167,267)(169,271)(174,276)(178,280)(179,281)(183,207)(187,288)(189,292)
     (190,293)(191,294)(194,297)(195,258)(196,299)(197,301)(198,277)(199,303)
     (200,305)(202,309)(203,310)(204,290)(205,312)(210,319)(211,320)(212,307)
     (216,326)(218,330)(219,331)(220,333)(223,337)(225,340)(226,341)(229,345)
     (231,349)(233,352)(235,355)(237,327)(239,360)(240,265)(241,361)(243,362)
     (244,364)(247,369)(248,370)(253,372)(254,375)(256,379)(259,359)(264,385)
     (266,381)(268,338)(269,387)(270,389)(272,390)(273,391)(275,393)(278,358)
     (279,396)(282,399)(283,401)(284,402)(285,403)(286,404)(287,406)(289,397)
     (291,409)(295,415)(296,416)(300,420)(302,423)(304,425)(306,429)(311,435)
     (313,439)(314,440)(316,427)(317,442)(318,444)(321,447)(322,449)(323,450)
     (324,451)(325,453)(328,454)(332,460)(334,412)(335,463)(336,464)(339,466)
     (342,470)(343,471)(344,473)(346,465)(347,363)(348,478)(350,462)(351,483)
     (356,459)(357,488)(365,421)(366,493)(367,468)(368,494)(371,498)(373,484)
     (374,430)(377,482)(380,503)(384,485)(386,507)(388,467)(392,512)(398,516)
     (405,524)(408,517)(413,530)(414,532)(417,438)(418,536)(419,538)(422,534)
     (424,542)(428,547)(431,549)(432,539)(433,445)(434,550)(436,552)(437,553)
     (441,554)(443,527)(446,560)(448,561)(452,544)(455,568)(456,461)(457,569)
     (458,571)(469,576)(472,578)(474,582)(475,583)(476,585)(477,586)(479,577)
     (480,589)(481,591)(486,595)(487,495)(489,597)(490,541)(491,598)(492,521)
     (497,602)(502,592)(504,603)(505,604)(506,605)(508,608)(509,557)(510,580)
     (511,611)(513,575)(514,614)(515,533)(519,618)(523,622)(525,623)(526,624)
     (531,621)(535,562)(537,613)(540,579)(543,633)(545,635)(546,636)(548,639)
     (551,627)(555,638)(556,642)(558,594)(559,590)(563,645)(564,570)(566,647)
     (567,574)(572,588)(573,649)(581,619)(584,607)(587,656)(593,657)(599,659)
     (600,612)(606,637)(615,651)(616,663)(617,664)(620,667)(625,668)(629,672)
     (630,661)(632,641)(634,655)(640,662)(643,676)(644,677)(646,680)(648,682)
     (654,681)(658,683)(660,671)(665,685)(673,687)(675,688)(678,691)(679,689)
     (686,690);