b21 := (1,2,3)(4,6,7)(5,8,9)(10,14,15)(11,16,17)(12,18,19)(13,20,21)(22,30,31)
     (23,32,33)(24,34,35)(25,36,37)(26,38,39)(27,40,41)(28,42,43)(29,44,45)
     (46,62,63)(47,64,65)(48,66,67)(49,68,69)(50,70,71)(51,72,73)(52,74,75)
     (53,76,77)(54,78,79)(55,80,81)(56,82,83)(57,84,85)(58,86,87)(59,88,89)
     (60,90,91)(61,92,93)(94,116,117)(95,118,109)(96,119,120)(97,111,121)(98,
     122,123)(99,124,125)(100,126,127)(101,110,128)(102,129,130)(103,131,132)
     (104,133,134)(105,135,136)(106,137,138)(108,139,140)(112,141,142)(113,
     143,144)(114,145,146)(115,147,148)(149,167,168)(150,169,156)(151,158,155)
     (152,170,171)(153,172,173)(154,174,175)(157,176,161)(159,177,178)(160,
     179,180)(162,181,182)(163,183,184)(164,185,186)(165,187,188)(166,189,190);