bbbb bbci bcbc bcbg bccc bcci bcit bctc bcuc bibb bibi bicc bicg bici bigb bigc bigg bigt bigu bitc bitt bitu btcc bttb bubb bubi bubu bucc buci bucu bugg bugi buic buit buiu but- buti butt cbbc cbcc cbct cbcu cbgb cbit cbtc ccbc cccb cccc ccci cccu ccgc ccgt ccic ccii cctb cctc cctt ccuc ccut cgcc cgcg cgtu cibc cibi cicc cici cict cicu cigi cigu ciii ciit citb citg citi citt citu ciuc ctbi ctgu ctic cub- cubb cubi cucc cuci cui- cuit cut- cutc cutt gc-c gcbc gccc gcic gcii gctc ggbt gggg gibb gigg gigi gubb gubi gubu guci gugb gugg gugi gugu guib guti gutt gutu ibtb ibtc icbc iccb iccc icci icct iccu icgc icub igbc igcc iiii iiit iitt iiuc itgc itic iucc iuiu tbcb tbcc tbit tccc tccu tctc tgcc tgtc tibi tibu ticc tigi tiit tiiu titc titi titt titu ttbb tttt tubb tubu tucc tugg tugu tuig tuit tuiu tuti tutt tutu ubbi ubic ubii ubit ucbc ucci ucut ugcc ugcg uggt uguu utti uttu utug uuuu