bbbb bbch bbrc bcbc bccc bcru bctc bcuc bhcc bhrt bhur bhut bhuu brcb brrr brtc bruc bruh brut btcc btrc btrt bttb bubb bubu bucc buch bucu buhr bur- burb burh burr burt buru but- butt cbbc cbcc cbcr cbct cbcu cbrh cbrt cbtc ccbc cccb cccc cccu cchr ccrc ccrt cctb cctc cctt ccuc ccut chch chrb chrc chrr chrt chtr chtt chub chur chut crbc crbu crcc crcr crrt crtc crub crut ctrc cub- cubb cucc curb curr curt cut- cutc cuth cutt hbtu hcbc hccb hccc hcch hhhh hrrc hrtb htcc httr hubb huch hucu huhu hurr hurt huru huth hutt hutu huub rbbb rbbr rcbc rccb rccc rchb rctc rrrr rtcc rubb rubu ruch ruct ruhh ruhr rurc ruru ruth rutt rutu tbcb tbcc tbrb tccc tccu tch- tchh tchr tchu tctc thch thru thtb thtr thur trcc trtc trtr trub truc trut truu ttbb tttt tubb tubr tubu tucc tuch tuht tuhu turb turc turr turt turu tutt tutu ucbc ucrc ucut uhuh urch urrh urth urur urut uttu uuuu