roob roof roon roor rooz rora rore roro roru roua roub roue rouf roun rouz roza roze rozz rrna rrrr rrun ruan ruba rubb rube rubu ruen ruer ruez rufa rufe ruff rufo runa rune runf runn runo rura rure ruro ruru ruun ruza ruze rzab uafa uaru uaua ubar ubba ubbe ubbo uber ubon ubra ueba uefa ueno ufer uffa uffe ufra unaa unan unar unau unbe uneb unee unef unen uner unna unne unno unon unra unrf unro unuz uofa uofo uone uor- uore uran urao urau urba urbe ure- urea urfa urfe urff urna urne uro- uroa uroo urra urre urun urur uruz urza uuen uuno uuuu uzan uzeb uzen uzer uzon uzun z-ro zaan zaar zaba zabo zabr zabu zaer zafu zana zane zann zano zara zarb zare zarf zaro zarr zaru zaun zaur zaza zazu zbar zber zeae zean zeba zebe zebu zeff zena zenn zeno zenu zeon zera zerf zero zeze znen zoan zoar zobo zoea zoff zon- zona zone zoo- zoon zora zorb zore zorn zoro zoza zozo zozu zrze zubo zubr zubu zune zunz zuoz zura zurb zurf zurn zurr zuru zuun zuzu zzzz