z1 := (2,4)(3,6)(5,8)(7,10)(9,13)(11,16)(12,18)(14,21)(15,23)(17,26)(19,29)
     (20,31)(22,30)(24,36)(25,38)(27,40)(28,42)(32,47)(33,49)(34,50)(35,52)
     (37,55)(39,58)(41,61)(43,64)(44,66)(45,67)(46,69)(48,72)(51,77)(53,80)
     (54,62)(56,84)(57,86)(59,89)(60,91)(63,95)(65,98)(68,103)(70,106)(71,108)
     (73,111)(74,113)(75,114)(76,116)(78,119)(79,121)(81,124)(82,125)(83,107)
     (85,129)(87,132)(88,134)(90,137)(92,140)(93,142)(94,143)(96,146)(97,148)
     (99,151)(100,153)(101,154)(102,156)(104,159)(105,160)(109,163)(110,165)
     (112,168)(115,173)(117,176)(118,178)(120,181)(122,145)(123,185)(126,141)
     (127,139)(128,191)(130,194)(131,196)(133,199)(135,202)(136,204)(138,207)
     (144,213)(147,217)(149,218)(150,220)(152,223)(155,228)(157,231)(158,233)
     (161,236)(162,203)(164,177)(166,193)(167,243)(169,244)(170,246)(171,247)
     (172,249)(174,222)(175,253)(180,258)(182,261)(183,263)(184,264)(186,267)
     (187,269)(188,270)(189,271)(190,272)(192,275)(195,234)(197,281)(198,283)
     (200,286)(201,288)(205,230)(206,294)(208,297)(209,298)(210,299)(211,300)
     (212,302)(214,305)(215,306)(216,308)(219,232)(221,315)(224,319)(225,321)
     (226,322)(227,324)(229,325)(235,332)(238,335)(240,336)(241,338)(242,339)
     (245,344)(248,348)(250,318)(251,282)(252,273)(254,353)(255,355)(256,356)
     (257,358)(259,361)(262,307)(265,368)(266,370)(268,276)(274,379)(277,342)
     (278,349)(279,383)(280,385)(284,390)(285,392)(287,317)(289,397)(290,399)
     (291,400)(292,402)(293,301)(295,405)(296,316)(303,412)(304,414)(310,419)
     (311,420)(312,422)(313,423)(314,425)(320,429)(323,433)(326,437)(327,438)
     (328,440)(330,441)(333,442)(334,443)(337,446)(340,450)(341,451)(345,454)
     (346,455)(350,362)(351,411)(352,459)(354,456)(357,466)(359,413)(360,369)
     (363,470)(364,471)(365,415)(366,473)(371,427)(372,476)(373,477)(374,460)
     (375,479)(376,480)(377,481)(378,482)(380,483)(381,484)(382,485)(384,486)
     (386,487)(387,489)(388,490)(389,491)(393,495)(394,496)(395,497)(396,499)
     (398,500)(401,501)(403,503)(404,504)(406,507)(407,508)(408,510)(409,511)
     (410,494)(416,516)(417,517)(418,428)(421,520)(424,505)(426,524)(431,526)
     (432,527)(435,529)(436,530)(439,512)(444,537)(447,452)(448,539)(449,541)
     (453,544)(457,547)(458,548)(462,552)(463,553)(464,554)(465,555)(467,519)
     (468,558)(469,559)(472,563)(474,565)(475,488)(492,578)(493,579)(498,513)
     (502,533)(506,588)(514,540)(515,592)(518,596)(521,599)(522,600)(525,564)
     (528,605)(531,608)(532,581)(535,610)(536,611)(538,614)(542,617)(543,619)
     (545,621)(546,615)(549,624)(550,568)(551,575)(556,629)(557,595)(560,597)
     (561,633)(562,573)(566,582)(567,634)(569,636)(570,637)(574,638)(576,583)
     (577,580)(584,590)(585,643)(586,593)(589,601)(591,644)(594,613)(598,647)
     (602,650)(603,651)(604,631)(606,654)(607,612)(609,657)(618,622)(620,653)
     (623,662)(625,640)(627,661)(628,664)(632,666)(639,668)(641,649)(642,659)
     (646,667)(648,665)(652,655)(658,670)(660,671);