a-fu aaaa aaab aaaf aaar aaas aaba aabb aabt aafa aafb aaff aara aars aart aaru aasa aasf aass aast aasu aata aatf aatt aaus abaa abab abaf abar abas abat abau abb- abba abbb abbr abbs abbt abff abra abrs abs- absa absf abss absu abta abts abtu abua abuf abus abut afaa afar afat afbs affa affs afft afr- afra afrs afru afsa afsb afst afta afts afua afus arab araf arar aras arat arau arba arbs arfa arfb arff arfs arft arfu arr- arra arrr arrs arrt arru ars- arsa arst arsu arta artr arts arua arub arut asaa asab asaf asar asas asat asau asba asbu asfa asra asrs asru assa assr asss asst assu asta astb astr asts asub asur asus at-t ataa atab atar atas atat atbs atfb atfs atra atru atsb atst atta attr atts attu atua atub atur atus auaa aufs aur- aura ausa aust ausu aut- auts baaa baaf baar baas baat baba babb babr babs babu baff baft bar- bara barb barf barr bars bart baru basa basf bass bast basu bata batf bats batt batu bau- bauf baur bbas bbau bbbb bbbs bfas bffs bfsr bfta bfts bftt brab braf bras brat brau brfu brrr brrs brsb brsr brst brus brut bsaa bsas bsat bsfa bsff bsfs bsra bsts btaa btaf btrt btss bttb btus buar buat buba bubb bubs bubu buff bufr bur- bura burb burr burs burt buru busa buss bust busu but- buta buts butt buus faaa faas faba fabs fabu fafa faff fara farb farr fars fart faru fasa fass fast fata fatf fats fatt faur faut fbar fbrs fbus ffar ffff ffrr ffsa ffss fftf frab fras frat frau frsb frst frta frub fsas fsra fssa fssf fsta ftrs ftsa ftsr ftub fuar fuat fubb fubs fubu fuff fufu fur- fura furr furs furt fusa fuss fust fusu futa futs futu raab raaf raas raat raba rabb rabs rabu rafa raff raft rara rarb rarf rars rasa rass rast rasu rata ratf rats ratt ratu raua raub rauf raus raut rbaf rbbb rbbr rbbs rbss rbst rras rrat rrrr rsaa rsaf rssa rsts rstu rsua rtas rtbf rtfb rtss rtts ruas ruba rubb rubs rubu rufa ruff ruft rura rurs ruru rusa russ rust rusu ruta ruts rutt rutu saab saaf saar saas saat saba sabb sabr sabs sabu safa safb saff safr saft safu sara sarf sarr sars sart saru sasa sasf sass sast sata satb satr sats satt satu saua sauf saur saus saut sbaa sbar sbas sbbs sbsa sbst sbus sfar sfas sfba sfra sfss sfsu sfts sraf sras srta srtr srub ssaa ssab ssas ssat ssau ssbr ssra ssrs sssa sssb sssf ssss ssta sstb ssts stab star stas stat stau stbs stfu stra strs stru stsf stss sttr stub stuf stur stus stut suar suas suat sub- suba subb subs suf- sufa suff sufr sufs sufu sur- sura surf surr surs surt suru sus- susa suss sust susu suta sutu suus taa- taaf taar taas taat taba tabb tabs tabu tafa taff taft tara tarb tarf tarr tars tart taru tasa tasb tasr tass tast tasu tata tatb tatr tats tatt tatu taua taub taur taus taut tbaf tbar tbas tbbs tbrb tbst tbta tfrs tfss traa trab traf tras trat trau trfr trra trst trtr trub trus trut truu tsaa tsar tsat tsau tssa tssf tssr tsst tsts ttab ttbb ttfa ttff ttss tttt tuar tuas tuat tuba tubb tubr tubs tubu tufa tuff tuft tufu tura turb turf turr turs turt turu tusa tuss tust tuta tuts tutt tutu uafa uars uart uaru uasa uata uatu uaua ubar ubba ubra ubtf uffa ufra uras urat urau urba urbs urfa urff urft urra ursa urss ursu urts urur urus urut us-a usaa usaf usar usas usat usba usbr usbs usfa usfs usra ussa ussb ussf ussr usss usst ussu usta ustb usts usua usus utas utau utsa uttu uuta uutf uuuu