nrrc nuan nuba nubc nuca nuch nucu nuha nuna nunc nung nunn nuno nuoc nuon nura nurc nurn nurr nuru oaau oahu oara oban obba obbo obon obor obra obrh obro obuh ocab ocac ocan ocbc occa occc occn ocga ocha ocna ocon ocra ocro ocrr ocur ogar ogb ogba ogna ogoa ogog ogon ogou ogra ogro ogun ohan ohau ohba ohcc ohgr ohho ohno ohob ohoh ohra ohrn onab onah onan onar onc- onca onco onga ongo ongu onha onna onno onon onor onra onur ooaa ooba oocr ooha ooho oona oooh oooo oora orab orac orah oran orao orar orba orbb orbo orbu orca orch orco orga orgn orgo orna ornc orno oro- oron oror orra orro orub ouac ouan oucc ouch ough oun- ouna oung our- oura ourn ouro ouu- raab raag raan raba rabb rabo rabu rac- raca racc rach raco racu raga ragg ragh rago ragu raha rahn rahr rahu rana ranc rang rann rano raob raoc raoh rara rarb raro raua raub rauc raun rbbb rbbr rbgh rboh rcac rcbc rcbo rccb rccc rcga rcgc rchb rcnr rcon rcrg rgan rgba rhag rhau rhbg rhcg rhoa rhob rhoc rhog rhoh rhon rhug rhun rnag rnbr rnco roab roag roan roar rob- roba robb robo robu roca rocc roch roco roga rogg rogh rogo roha rohn rohr rohu rona ronc rong rono roob roog roon roor rora rorc roro roru roua roub rouh roun rrah rrna rrrr rrun ruag ruah ruan ruba rubb rubu ruca ruch ruga rugg rugh ruhh ruhn ruhr runa runc rung runn runo rura rurc ruro ruru ruun uabc uaca uang uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubon ubra ucan ucar ucbc ucca ucha ucho ucon ucrc ucua ugab ugao ugar ugcc ugcg uggo ugra ugro ugur uguu uhna uhno uhoh uhuh unaa unac unan unar unau unca uncc uncg unch unco unga ungo ungu unha unna unno unon unra unro uocc uor- urac uran urao urau urba urca urch urga urgh urgu urho urna uro- uroa uroo urra urrh urun urur uuno uuoc uuuu