aaaa aaab aaal aaar aaba aabb aabl aala aall aalo aalu aaoo aara aaro aaru abaa abab abal abar abau abb- abba abbb abbo abbr abla ablo aboa abob abol aboo abor abou abra abro abua abul alaa alal alao alar alau alb- alba albo albu all- alla alll allo allr allu aloa alol aloo alor alou alro alua alur aoba aola aora aorb aoul arab aral arar arau arba arla arlo aroa arob aroo aror arr- arra arro arrr arru arua arub arul auaa aul- aula aull aulo aulu auol aur- aura auro baaa baal baar baba babb babo babr babu bala ball balo balu baol bar- bara barb baro barr baru bau- baul baur bbau bbbb bblb blaa blab blau blob bloo blou blub blur boab boal boar boba bobb bobo bobu bola boll bolo bolu boob bool boor bor- bora boro borr boru boua boul bour brab brao brau broa brob brol broo bror brou brrr bual buar buba bubb bubo bubu bula bulb bull bulu buol bur- bura burb burl buro burr buru laaa laal laar laba labo labr labu lala lall lalo lalu laou lara larb larr laru laub laul laur lbar lblr llao llll lloa lloo loar lob- loba lobb lobo lola loll lolo loob lool loor lora loro loul lour louu lral lrba lrrr luau luba lula lull lulu lura luua oaau oall oara obal obba obbo obla oblu obol obor obra obro olar olba olbo olla ollo olor olur ooaa ooba oola oolo oooo oora orab oral orao orar orba orbb orbo orbu orla orlo orlu oro- oror orra orro orub oula oulu our- oura ouro ouu- raab raba rabb rabl rabo rabu rala ralb rall ralo raob raol rara rarb raro raua raub raul rbbb rbbr rlab rlua roab roar rob- roba robb robo robu rola roll rolo roob rool roor rora roro roru roua roub roul rrrr ruba rubb rubu rula rull rulo rura ruro ruru uaru uaua ubal ubar ubba ubbo ubla ublo ubra ulaa ular ulla ullo ullr ulo- ulua ulul uor- ural urao urau urba urla uro- uroa urol uroo urra urur uulu uuuu