z1 := (2,4)(3,6)(5,9)(7,12)(8,14)(10,17)(11,19)(13,22)(15,25)(16,27)(18,30)
     (20,33)(21,35)(23,38)(24,39)(26,42)(28,43)(29,45)(31,48)(32,50)(34,53)
     (36,56)(37,58)(40,63)(41,64)(44,68)(46,71)(47,73)(49,76)(51,79)(52,81)
     (54,82)(55,84)(57,72)(59,89)(60,91)(61,80)(62,93)(65,98)(66,99)(67,101)
     (69,104)(70,106)(74,109)(75,110)(77,113)(78,115)(83,122)(85,125)(86,127)
     (88,129)(90,132)(92,135)(94,138)(95,140)(96,141)(97,143)(100,148)(102,
     151)(103,153)(105,156)(107,158)(108,160)(111,165)(112,167)(114,159)(116,
     172)(117,174)(119,176)(120,177)(121,179)(123,180)(124,182)(126,184)(128,
     187)(130,190)(131,145)(133,193)(134,195)(136,198)(137,199)(139,201)(142,
     206)(144,209)(146,211)(147,213)(149,216)(150,218)(152,166)(154,223)(155,
     224)(157,227)(161,230)(162,232)(163,233)(164,235)(168,240)(169,242)(170,
     243)(171,245)(173,247)(175,250)(178,254)(181,259)(183,262)(185,265)(186,
     266)(188,269)(189,271)(191,274)(192,275)(194,278)(196,267)(197,281)(200,
     284)(202,287)(203,289)(204,290)(205,292)(207,295)(208,296)(210,299)(212,
     263)(214,304)(215,306)(217,309)(219,311)(220,313)(221,314)(222,316)(225,
     321)(226,323)(228,326)(229,328)(231,293)(234,333)(236,336)(237,338)(238,
     329)(239,340)(241,335)(244,346)(246,348)(248,342)(249,350)(251,353)(252,
     354)(253,312)(255,317)(256,359)(258,361)(260,364)(264,367)(268,371)(270,
     374)(272,375)(273,377)(276,380)(279,384)(280,300)(282,387)(285,388)(286,
     390)(288,393)(291,327)(294,400)(297,404)(298,406)(301,409)(302,410)(303,
     412)(305,322)(307,417)(308,418)(310,421)(315,425)(318,383)(320,430)(324,
     355)(325,434)(331,438)(332,440)(334,443)(337,445)(339,396)(341,448)(343,
     449)(344,407)(345,451)(347,419)(349,454)(351,379)(352,457)(357,442)(358,
     461)(360,464)(362,467)(363,469)(365,385)(366,370)(368,444)(369,473)(372,
     411)(373,401)(376,478)(378,480)(381,472)(382,483)(386,487)(389,399)(391,
     492)(392,494)(395,496)(397,498)(398,436)(402,408)(403,456)(405,502)(413,
     476)(414,509)(415,446)(416,482)(420,514)(422,515)(423,516)(424,495)(426,
     517)(427,519)(428,520)(429,521)(431,524)(432,526)(433,527)(435,530)(439,
     533)(441,534)(447,535)(450,505)(452,485)(453,539)(455,500)(458,540)(459,
     541)(460,468)(462,542)(463,465)(466,522)(470,549)(474,552)(475,523)(477,
     512)(481,484)(486,547)(488,557)(489,559)(490,560)(491,561)(493,563)(497,
     506)(499,564)(501,565)(503,566)(504,543)(507,567)(508,568)(510,570)(511,
     556)(513,572)(518,578)(528,583)(529,532)(531,586)(536,588)(538,590)(544,
     555)(545,574)(546,594)(548,553)(550,595)(551,596)(554,576)(558,597)(562,
     600)(569,580)(573,575)(577,584)(582,604)(585,607)(587,603)(589,610)(591,
     611)(592,608)(593,612)(602,615)(605,606)(613,614);