rabb rabi rabo rabu rac- raca racc raci raco racu raia raic raii rain rair raiu rana ranc rani rann rano raob raoc rara rarb rari raro raua raub rauc raun rbbb rbbr rcac rcbc rcbo rccb rccc rcic rcnr rcon riaa riab riai rian riau rib- riba ribo ribu rica ricc rico riia riin rina rinn rino rion riou riri rnai rnbr rnco rnin roab roan roar rob- roba robb robi robo robu roca rocc roco roia roin roio roir roiu rona ronc roni rono roob rooi roon roor rora rorc rori roro roru roua roub roun rrna rrrr rrun ruan ruba rubb rubi rubu ruca ruci ruin runa runc runi runn runo rura rurc ruri ruro ruru ruun uabc uaca uair uaoc uarc uaru uaua ubac ubar ubba ubbi ubbo ubic ubii ubir uboc ubon ubra ucai ucan ucar ucbc ucca ucci ucin ucio ucon ucrc ucua uica uira uirr unaa unac unai unan unar unau unca uncc unci unco uni- unia unic unii unin unio unir unna unni unno unon unra unro uocc uor- urac urai uran urao urau urba urbi urca urci uria urib uric urin uriu urna urni uro- uroa uroo urra urri urun urur uuni uuno uuoc uuri uuuu