b21 := (1,194,84)(2,32,97)(3,199,105)(4,14,11)(5,196,79)(6,34,92)(7,140,42)(8,
     208,88)(9,145,101)(10,142,37)(12,191,82)(13,29,95)(15,137,40)(16,19,21)
     (17,197,85)(18,35,98)(20,143,43)(22,25,27)(23,198,86)(24,36,99)(26,144,
     44)(30,205,81)(31,100,94)(33,151,39)(38,195,150)(41,141,146)(45,96,139)
     (46,49,51)(47,201,89)(48,54,102)(50,147,55)(56,59,61)(57,202,90)(58,64,
     103)(60,148,65)(67,124,111)(68,207,119)(69,129,120)(70,126,106)(71,153,
     115)(72,121,109)(73,127,112)(74,128,113)(75,135,108)(76,125,152)(77,131,
     116)(78,132,117)(80,192,204)(83,138,200)(87,93,193)(91,122,206)(104,123,
     114)(107,203,134)(110,149,130)(118,133,136)(154,257,237)(155,274,245)
     (156,262,246)(157,259,232)(158,271,241)(159,254,235)(160,260,238)(161,
     261,239)(162,268,234)(163,258,249)(164,264,242)(165,265,243)(166,270,247)
     (167,255,252)(168,256,240)(169,266,248)(170,269,244)(171,263,236)(172,
     175,177)(173,210,185)(174,180,186)(176,189,181)(184,188,187)(190,273,251)
     (209,267,233)(211,214,216)(212,231,224)(213,219,225)(215,228,220)(223,
     227,226)(229,275,253)(250,272,276);