aaaa aaab aaar aaba aabb aabt aaoo aara aaro aart aaru aata aatt abaa abab abar abat abau abb- abba abbb abbo abbr abbt aboa abob aboo abor abot abou abra abro abta abtu abua abut aoba aora aorb aort aout arab arar arat arau arba aroa arob aroo aror arr- arra arro arrr arrt arru arta arto artr arua arub arut at-t ataa atab atar atat atob ator atot atra atro atru atta atto attr attu atua atub atur auaa aur- aura auro aut- auto baaa baar baat baba babb babo babr babu bar- bara barb baro barr bart baru bata bato batt batu bau- baur bbau bbbb boab boar boat boba bobb bobo bobu boob boor boot bor- bora boro borr bort boru bota botb boto bott boua bour bout brab brao brat brau broa brob broo bror brot brou brrr brut btaa btob btor btrt bttb buar buat buba bubb bubo bubu bur- bura burb buro burr burt buru but- buta buto butt oaau oara obba obbo obor obot obra obro ooaa ooba oooo oora oort ootb orab orao orar orat orba orbb orbo orbu oro- oror orot orra orro orta orto orub otar oto- otoo otor otra otro otta otto ottu otur ouat our- oura ouro ourt out- outa outb outo ouu- raab raat raba rabb rabo rabu raob rara rarb raro rata rato ratt ratu raua raub raut rbbb rbbr roab roar roat rob- roba robb robo robt robu roob roor root rora roro rort roru rota roto rotr rott roua roub rout rrat rrrr ruba rubb rubu rura ruro ruru ruta ruto rutt rutu taa- taar taat taba tabb tabo tabu taoa taor taou tara tarb taro tarr tart taru tata tatb tato tatr tatt tatu taua taub taur taut tbar tbrb tbta toab toat toau toba tobo tobt tobu tooa toor toot tora toro torr tort toru tota toto totr tott tour tout traa trab trao trat trau troa troo trot trou trra trtr trub trut truu ttab ttbb tttt tuao tuar tuat tuba tubb tubo tubr tubu tuor tura turb turo turr turt turu tuta tuto tutt tutu tuuo uart uaru uata uatu uaua ubar ubba ubbo ubra uor- urao urat urau urba uro- uroa uroo urra urur urut utau utor utto uttu uuta uuuu