refr refu reif reii reim rein reir reiu reme remi remn remo rene reni renn reno renu reof reou rere reri rero reru reue reuf reuu rfef rfem rib- ribe ribo ribu rief riem rien rier rieu rife riff rifu riif riin rime rimi rimm rimo rimu rine rinf rinn rino riom rion riou rire riri riue rmif rmon rnbr rnie rnin rob- robb robe robi robo robu roen roer rofe roff rofo roif roin roio roir roiu romb rome romi romm romo rone roni rono roob roof rooi room roon roor rore rori roro roru roub roue rouf roum roun rrif rrrr rrum rrun rubb rube rubi rubu ruen ruer rufe ruff rufo ruif ruin rumb rume rumi rumm rumo rune runf runi runn runo rure ruri ruro ruru ruun u-ie ubbe ubbi ubbo uber ubii ubir ubon uein ueir ueno ufer uffe uirr umb- umbe umbi umbo umer umff ummo umno umoe umor umri unbe uneb unee unef unen uner uni- unie unif unii unin unio unir unmr unne unni unno unon unrf unro unum uofm uofo uomo uone uor- uore urbe urbi ure- urfe urff urfi urib urie urif urim urin uriu urmi urne urni uro- urom uroo urre urri urum urun urur uuen uuni uuno uuri uuuu