-ous aaaa aaab aaar aaas aaba aabb aaoo aara aaro aars aaru aasa aass aasu aaus abaa abab abar abas abau abb- abba abbb abbo abbr abbs aboa abob aboo abor abos abou abra abro abrs abs- absa abss absu abua abus aoba aora aorb aors aoss aous arab arar aras arau arba arbs aroa arob aroo aror aros arr- arra arro arrr arrs arru ars- arsa arso arsu arua arub asaa asab asao asar asas asau asba asbo asbu asob asor asos asou asra asro asrs asru assa asso assr asss assu asub asur asus auaa aur- aura auro ausa ausu baaa baar baas baba babb babo babr babs babu baos bar- bara barb baro barr bars baru basa baso bass basu bau- baur bbas bbau bbbb bbbs boab boar boas boba bobb bobo bobs bobu boob boor boos bor- bora boro borr bors boru bosa boso boss bosu boua bour bous brab brao bras brau broa brob broo bror bros brou brrr brrs brsb brsr brus bsaa bsas bsos bsra buar buba bubb bubo bubs bubu bur- bura burb buro burr burs buru busa buss busu buus oaau oara oars oass obas obba obbo obor obos obra obro obsr obss obus ooaa ooba oooo ooos oora oosa oous orab orao orar oras orba orbb orbo orbs orbu oro- oror oros orra orro orrs orsa orso orsu orub orus osar osas osba osoo osor osos osro ossa ossb osso ossu oubs our- oura ouro ours ousa ouu- raab raas raba rabb rabo rabs rabu raob raos rara rarb raro rars rasa raso rass rasu raua raub raus rbbb rbbr rbbs rbss roab roar roas rob- roba robb robo robs robu roob roor roos rora roro roru rosa roso ross roua roub rous rras rrrr rsaa rsos rssa rsua ruas ruba rubb rubs rubu rura ruro rurs ruru rusa ruso russ rusu s-os saab saar saas saba sabb sabo sabr sabs sabu saor saos saou sara saro sarr sars saru sasa saso sass saua saur saus sbaa sbar sbas sbbs sbor sbsa sbus soar soas soba sobo sobr sobs sobu soor soos sora sorb soro sorr sors soru sosa soso soss sour sous sras sros srub ssaa ssab ssao ssas ssau ssbr ssra ssrs sssa sssb ssss suar suas sub- suba subb subo subs suor suos sur- sura suro surr surs suru sus- susa suso suss susu suus uars uaru uasa uaua ubar ubba ubbo ubos ubra uor- urao uras urau urba urbs uro- uroa uroo urra ursa urso urss ursu urur urus us-a usaa usar usas usba usbr usbs usos usra ussa ussb ussr usss ussu usua usus uuuu