rabul radal radar radau radla radlo radul ragda ragga ragoo ralla rallo raoul rarbg rauda raugu rdllr ro-ro roadb roald roall robab robar robbo robo- robor robur rodau rodbo rodda rodl rodor rogal rogla rolag rolao rolga rolla rollo rolua rooba roodu roral rorbu rorra rouba roull roura rraga rragb ruala rubab rubba rubor rubra rudar rudra rugal rugao rugla rullo rural u-dub u-god uarda uaroo ubald ubobo uboga udala udall udara udol udoll udora ugada ugala ugboa uggla ugola ugro- ugrug ulala ulalu ulbra ullal ullar ulloa ullur ulula ululu uluru uolba uorga uraba uraga urago uralo urbar urdog urgal urlar urola uroob urour urrao urubu uuard uugla uurad uuuuu