a-do a-fu aaaa aaab aaad aaaf aaar aaba aabb aabd aabt aada aadt aadu aafa aafb aafd aaff aaoo aara aard aaro aart aaru aata aatf aatt abaa abab abad abaf abar abat abau abb- abba abbb abbo abbr abbt abda abdo abdu abff aboa abob abod abof aboo abor abot abou abra abro abta abtu abua abud abuf abut adaa adab adad adao adar adat adba adda addd addo addr addu adfa adob adod adoo ador adot adra adro adta adua adub adur afaa afad afao afar afat afdb affa affo afft afoa afoo afor afr- afra afro afru afta afua afud aoba aora aorb aort aotd aotf aouf aout arab arad araf arar arat arau arba arda ardf ardo ardu arfa arfb arff arft arfu aroa arob arod aroo aror arr- arra arro arrr arrt arru arta arto artr arua arub arud arut at-t ataa atab atad atar atat atdt atfb atob atod atof ator atot atra atro atru atta atto attr attu atua atub atur auaa audo aur- aura aurd auro aut- auto baaa baad baaf baar baat baba babb babo babr babu bada badb badd bado badr badu baff bafo baft bar- bara barb bard barf baro barr bart baru bata batf bato batt batu bau- baud bauf baur bbad bbau bbbb bbdd bbdo bd-r bduf bfta bftt boab boad boar boat boba bobb bobo bobu boda bodb bodo bodu bofa bofd boff bofu boob bood boof boor boot bor- bora bord borf boro borr bort boru bota botb botd boto bott boua boud bouf bour bout brab brad braf brao brat brau brda brdo brdt brfu broa brob brod broo bror brot brou brrr brud brut btaa btaf btdt btob btor btrt bttb buad buar buat buba bubb bubo bubu buda budb budd budo budu buff bufo bufr bur- bura burb burd buro burr burt buru but- buta buto butt d-bo daab daad daar daau daba dabb dabo dabt dabu dada dado dadu dafa daff dafo daft daou dara darb dard darf daro darr dart daru data dato datr datt datu daub daud daur daut dbar dbfo dbtt dddd ddot ddub dfaf dfdt dffa dfrf dftr doab doar doat doba dobb dobu dod- doda dodd dodo doff doob dood doof door doot dora dord dorf doro dorr dort doru dota dotd doto dott doub doud douf dour dout draa drab drad draf drar drat drau drba drda drob drod drof drot drou drra drua drub drut druu dtaa dtor dtot duaa duab duad duar duat dub- duba dubb dubu duda dudd dudo dudu duff dufu duo- dura duro durt duru duta duur duut faaa faad faba fabd fabo fabu fada fadd fado fafa faff fafo fara farb fard faro farr fart faru fata fatf fato fatt faud faur faut fbar fdoa fdot ffar ffff ffrr fftf foad foaf foar foba fobt foda fofo food foof foot for- fora forb ford foro forr fort fota foto fott foua foud four fout frab frad frat frau frob frot frou frta frub ftub fuad fuar fuat fubb fubu fuda fudd fuff fufu fuor fur- fura furo furr furt futa futo futu oaau oafo oara obad obba obbo obdt obor obot obra obro obtd odbo odda oddd odoo odor odot odou odra odtu odur ofdr off- offa offo offr offu ofor ofra ofta ooaa ooba ooda ooff oooo oora oord oort ootb orab orad orao orar orat orba orbb orbo orbu orda ordo ordu orff orfu oro- orof oror orot orra orro orta orto orub otar otbd oto- otof otoo otor otra otro otta otto ottu otur ouad ouat ouff our- oura ouro ourt out- outa outb outo ouu- raab raad raaf raat raba rabb rabo rabu rada radd rado radr radt radu rafa raff raft raob rara rarb rarf raro rata ratf rato ratt ratu raua raub raud rauf raut rbaf rbbb rbbr rdfa roab road roaf roar roat rob- roba robb robo robt robu roda rodd rodo roff rofo roob rood roof roor root rora roro rort roru rota roto rotr rott roua roub roud rouf rout rrad rrat rrrr rtbf rtdt rtfb ruad ruba rubb rubu ruda rudd rudo rufa ruff rufo ruft rura rurd ruro ruru ruta ruto rutt rutu ruud taa- taaf taar taat taba tabb tabo tabu tada tado tafa taff tafo taft taoa taor taou tara tarb tard tarf taro tarr tart taru tata tatb tato tatr tatt tatu taua taub taur taut tbaf tbar tbrb tbta tddb tdff tdor tdra tfot toab toad toat toau toba tobo tobt tobu toda todd todo todt todu tofa toff tofo toft tofu tooa tood toof toor toot tora tord torf toro torr tort toru tota totd toto totr tott tour tout traa trab trad traf trao trat trau trfd trfr troa trod troo trot trou trra trtr trub trud trut truu ttab ttbb ttfa ttff tttt tuao tuar tuat tuba tubb tubo tubr tubu tudu tufa tuff tufo tuft tufu tuor tura turb turd turf turo turr turt turu tuta tuto tutt tutu tuuo uafa uart uaru uata uatu uaua ubar ubba ubbo ubod ubra ubtf ubud udaa udad udar udau udoo udot udra uffa ufra uofa uofo uor- urad urao urat urau urba urda urdu urfa urff urft uro- uroa uroo urra urur urut utau utfo utor utto uttu uuta uutf uuuu