z1 := (2,5)(4,8)(6,13)(7,11)(9,16)(10,17)(12,21)(14,24)(15,26)(18,32)(19,30)
     (20,34)(22,38)(23,39)(25,43)(27,47)(28,29)(31,53)(33,56)(35,60)(36,58)
     (40,68)(41,66)(42,70)(44,74)(45,75)(46,51)(48,80)(49,81)(50,82)(52,84)
     (54,88)(55,89)(57,93)(61,99)(62,100)(63,97)(64,102)(65,96)(67,106)(69,
     109)(71,113)(72,114)(73,116)(76,122)(77,123)(78,120)(83,130)(85,133)(86,
     111)(87,132)(90,138)(91,137)(92,140)(94,144)(95,145)(98,147)(103,143)
     (104,154)(105,131)(107,157)(108,158)(110,161)(112,164)(115,152)(117,168)
     (118,169)(124,150)(125,176)(127,179)(128,181)(136,187)(139,190)(141,192)
     (142,174)(148,191)(149,153)(151,203)(155,206)(156,175)(159,210)(160,211)
     (163,199)(165,213)(166,214)(170,215)(171,198)(172,218)(177,222)(178,220)
     (180,223)(182,209)(183,207)(188,208)(189,226)(193,219)(194,230)(195,231)
     (196,229)(197,200)(201,228)(202,235)(204,225)(205,236)(217,234)(221,232)
     (224,238)(227,237);