raia raic raii raim rair raiu rama ramb rami ramm ramo ramu raob raoc raom rara rarb rari raro raua raub rauc raum rbbb rbbr rcac rcbc rcbo rccb rccc rcic riaa riab riai riam riau rib- riba ribo ribu rica ricc rico riia rima rimi rimm rimo rimu riom riou riri roab roam roar rob- roba robb robi robo robu roca rocc roco roia roio roir roiu roma romb romi romm romo roob rooi room roor rora rorc rori roro roru roua roub roum rrmc rrrr rrum ruba rubb rubi rubu ruca ruci ruma rumb rumi rumm rumo rura rurc ruri ruro ruru uabc uaca uair uamc uaoc uarc uaru uaua ubac ubar ubba ubbi ubbo ubic ubii ubir uboc ubra ucai ucam ucar ucbc ucca ucci ucio ucmc ucom ucrc ucua uica uima uira uirr umaa umac umai umar umb- umba umbi umbo umma ummo umor umra umri uocc uomo uor- urac urai urao urau urba urbi urca urci uria urib uric urim uriu urma urmi uro- uroa urom uroo urra urri urum urur uuoc uuri uuuu