aaaa aaab aaar aaas aaba aabb aabt aara aars aart aaru aasa aass aast aasu aata aatt aaus abaa abab abar abas abat abau abb- abba abbb abbr abbs abbt abra abrs abs- absa abss absu abta abts abtu abua abus abut arab arar aras arat arau arba arbs arr- arra arrr arrs arrt arru ars- arsa arst arsu arta artr arts arua arub arut asaa asab asar asas asat asau asba asbu asra asrs asru assa assr asss asst assu asta astb astr asts asub asur asus at-t ataa atab atar atas atat atbs atra atru atsb atst atta attr atts attu atua atub atur atus auaa aur- aura ausa aust ausu aut- auts baaa baar baas baat baba babb babr babs babu bar- bara barb barr bars bart baru basa bass bast basu bata bats batt batu bau- baur bbas bbau bbbb bbbs brab bras brat brau brrr brrs brsb brsr brst brus brut bsaa bsas bsat bsra bsts btaa btrt btss bttb btus buar buat buba bubb bubs bubu bur- bura burb burr burs burt buru busa buss bust busu but- buta buts butt buus raab raas raat raba rabb rabs rabu rara rarb rars rasa rass rast rasu rata rats ratt ratu raua raub raus raut rbbb rbbr rbbs rbss rbst rras rrat rrrr rsaa rssa rsts rstu rsua rtas rtss rtts ruas ruba rubb rubs rubu rura rurs ruru rusa russ rust rusu ruta ruts rutt rutu saab saar saas saat saba sabb sabr sabs sabu sara sarr sars sart saru sasa sass sast sata satb satr sats satt satu saua saur saus saut sbaa sbar sbas sbbs sbsa sbst sbus sras srta srtr srub ssaa ssab ssas ssat ssau ssbr ssra ssrs sssa sssb ssss ssta sstb ssts stab star stas stat stau stbs stra strs stru stss sttr stub stur stus stut suar suas suat sub- suba subb subs sur- sura surr surs surt suru sus- susa suss sust susu suta sutu suus taa- taar taas taat taba tabb tabs tabu tara tarb tarr tars tart taru tasa tasb tasr tass tast tasu tata tatb tatr tats tatt tatu taua taub taur taus taut tbar tbas tbbs tbrb tbst tbta traa trab tras trat trau trra trst trtr trub trus trut truu tsaa tsar tsat tsau tssa tssr tsst tsts ttab ttbb ttss tttt tuar tuas tuat tuba tubb tubr tubs tubu tura turb turr turs turt turu tusa tuss tust tuta tuts tutt tutu uars uart uaru uasa uata uatu uaua ubar ubba ubra uras urat urau urba urbs urra ursa urss ursu urts urur urus urut us-a usaa usar usas usat usba usbr usbs usra ussa ussb ussr usss usst ussu usta ustb usts usua usus utas utau utsa uttu uuta uuuu