z1 := (2,4)(3,5)(6,10)(7,12)(8,14)(9,16)(11,20)(13,15)(17,29)(18,30)(19,32)
     (21,36)(23,38)(24,40)(26,43)(27,44)(28,46)(31,51)(33,54)(37,58)(39,61)
     (41,63)(42,65)(45,69)(47,73)(49,74)(50,76)(52,79)(56,83)(57,85)(60,88)
     (62,91)(66,94)(67,96)(70,101)(71,102)(72,104)(75,108)(78,112)(80,115)(81,
     116)(82,117)(84,120)(86,124)(87,125)(89,128)(90,129)(92,132)(93,133)(95,
     136)(97,140)(98,141)(99,142)(100,143)(105,151)(106,152)(107,154)(109,157)
     (110,158)(111,160)(113,163)(114,165)(118,171)(119,138)(121,174)(122,175)
     (123,177)(126,182)(127,184)(130,176)(131,188)(134,191)(135,193)(137,196)
     (139,198)(144,200)(145,202)(146,204)(147,206)(148,208)(149,209)(150,211)
     (153,216)(155,220)(156,221)(159,226)(162,230)(164,233)(166,237)(167,238)
     (168,239)(169,240)(170,242)(172,245)(173,187)(179,252)(180,253)(181,255)
     (183,257)(185,259)(186,260)(189,262)(190,264)(194,261)(195,256)(197,272)
     (199,275)(201,271)(203,281)(207,287)(210,292)(212,296)(213,297)(214,298)
     (215,294)(217,302)(218,303)(219,304)(223,310)(224,311)(227,284)(231,317)
     (232,319)(234,278)(235,322)(236,324)(241,331)(243,334)(244,336)(247,340)
     (248,342)(249,343)(250,344)(251,345)(254,349)(258,353)(263,359)(265,362)
     (266,364)(267,366)(268,367)(269,369)(273,372)(274,374)(276,378)(277,380)
     (279,382)(280,306)(286,387)(288,365)(290,318)(291,391)(293,393)(295,395)
     (299,401)(300,402)(301,315)(305,407)(307,409)(308,411)(309,413)(312,417)
     (313,419)(316,422)(320,329)(321,426)(323,428)(325,431)(326,432)(327,433)
     (328,434)(330,436)(332,440)(333,442)(335,444)(337,404)(338,448)(339,450)
     (346,460)(347,427)(348,462)(350,466)(351,467)(352,468)(354,471)(355,472)
     (357,449)(360,476)(361,478)(363,482)(370,486)(371,453)(373,490)(375,425)
     (376,493)(377,383)(379,497)(381,499)(384,500)(385,397)(388,503)(389,505)
     (390,507)(392,509)(394,511)(396,513)(398,514)(399,515)(400,452)(405,521)
     (406,522)(408,523)(412,526)(414,517)(415,512)(416,528)(418,469)(420,524)
     (421,533)(423,536)(424,537)(429,542)(430,540)(435,474)(439,475)(443,554)
     (445,556)(446,557)(447,559)(456,506)(457,484)(458,564)(459,546)(461,568)
     (463,570)(464,571)(465,572)(473,495)(477,581)(480,578)(481,584)(483,587)
     (485,588)(488,590)(489,592)(491,569)(496,597)(498,565)(501,601)(502,558)
     (504,602)(508,563)(516,580)(518,595)(520,610)(525,614)(527,615)(529,618)
     (530,613)(531,619)(532,621)(534,623)(535,624)(538,628)(539,576)(541,631)
     (543,579)(544,600)(545,633)(547,635)(548,577)(550,573)(552,582)(553,598)
     (555,638)(560,627)(561,643)(562,645)(567,585)(574,629)(575,653)(589,658)
     (591,612)(593,661)(596,662)(599,664)(603,647)(604,666)(605,626)(606,648)
     (608,668)(609,665)(611,670)(616,672)(617,656)(620,667)(622,654)(625,650)
     (632,641)(634,636)(637,680)(639,681)(640,652)(642,646)(644,682)(651,677)
     (657,676)(659,689)(660,690)(669,692)(671,674)(673,685)(678,679)(683,688)
     (684,691);