b11 := (1,2)(3,5)(7,9)(8,10)(11,13)(12,15)(14,17)(16,20)(18,23)(19,24)(22,28)
     (25,32)(26,34)(27,36)(29,37)(30,38)(31,40)(33,43)(35,44)(41,49)(45,52)
     (46,53)(47,55)(48,57)(50,54)(51,61)(56,59)(58,67)(62,70)(63,72)(64,74)
     (65,76)(66,77)(68,79)(71,75)(73,81)(78,87)(80,83)(82,90)(84,91)(85,86)
     (88,93)(89,94)(92,97)(95,101)(96,103)(98,106)(99,107)(100,109)(102,112)
     (104,113)(105,115)(108,118)(110,121)(111,123)(116,127)(117,129)(119,131)
     (120,132)(122,134)(124,136)(125,137)(126,138)(128,133)(130,142)(139,140)
     (141,145)(148,151)(149,155)(150,157)(152,153)(154,159)(158,163)(160,164)
     (161,162);