aaaa aaab aaar aaav aaba aabb aabt aaoo aara aaro aart aaru aata aatt aava abaa abab abar abat abau abb- abba abbb abbo abbr abbt aboa abob aboo abor abot abou abov abra abro abta abtu abua abut abva aoba aora aorb aort aout arab arar arat arau arba aroa arob aroo aror arr- arra arro arrr arrt arru arta arto artr artv arua arub arut arva arvo 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 avab avao avar avat avor avot avou avra avro avur avva avvo baaa baar baat baba babb babo babr babu bar- bara barb baro barr bart baru bata bato batt batu bau- baur bava bavu 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 bova bovo brab brao brat brau brav broa brob broo bror brot brou brrr brut bruv 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 orav orba orbb orbo orbu oro- oror orot orra orro orta orto orub orvr otar oto- otoo otor otov otra otro otta otto ottu otur ouat our- oura ouro ourt out- outa outb outo ouu- ovar ovo- ovoo ovot ovra raab raat raba rabb rabo rabu raob rara rarb raro rata rato ratt ratu raua raub raut rava 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 rova rovo rrat rrrr rtva ruba rubb rubu rura ruro ruru ruta ruto rutt rutu ruvu taa- taar taat taba tabb tabo tabu taoa taor taou tara tarb taro tarr tart taru tata tatb tato tatr tatt tatu tatv taua taub taur taut tava tavo tbar tbrb tbta toab toat toau toba tobo tobt tobu tooa toor toot tora toro torr tort toru torv tota toto totr tott tour tout touv tova tovo traa trab trao trat trau trav 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 tuva tvro tvrr tvtv uart uaru uata uatu uatv uaua ubar ubba ubbo ubra uor- uovo urao urat urau urba uro- uroa uroo urra urur urut urva utau utor utto uttu uuta uuuu uv-a uv-b uvaa uvat uvvu vaar vaat vara varr vart varu vata vato vatt vatu vaut vava voar voat voor voot vor- vora voro vort voru vota voto vour vout vrav vrba vrot vrto vurb vurt vutv vvob vvvv