reem refe reff refi refl refr refu reif reii reil reim reir reiu relb rele rell relm relo reme remi remo reof reol reou rere reri rero reru reue reuf reul reuu rfef rfem rffl rib- ribe ribo ribu rief riel riem rier rieu rife riff rifu riif rile rill rilo rilu rime rimi rimm rimo rimu riol riom riou rire riri riue rlee rlef rleu rlif rlml rmif rmll rob- robb robe robi robo robu roel roer rofe roff rofl rofo roif roil roio roir roiu role rolf roll rolm rolo romb rome romi romm romo roob roof rooi rool room roor rore rori roro roru roub roue rouf roul roum rrif rrle rrrr rrum rubb rube rubi rubu ruel ruer rufe ruff rufo ruif rule rull rulo rumb rume rumi ruml rumm rumo rure ruri ruro ruru u-ie ubbe ubbi ubbo uber ubii ubir uble ubli ublo ueir uele ueli uell ufel ufer uffe uile uiml uirr uleb ulee uleo ulfe ulie ulim ulle ulli ullo ullr ulme ulmi ulmo ulmu ulo- ulul ulum umb- umbe umbi umbo umer umff ummo umoe umol umor umri uofl uofm uofo uoml uomo uor- uore urbe urbi ure- urfe urff urfi urib urie urif urim uriu urle urmi uro- urol urom uroo urre urri urum urur uulu uuri uuuu