surs suru sus- susa suso susp suss susu suus u-rp uafa uars uaru uasa uasp uaua uffa ufos ufra ulaa ular ulas ulla ullo ullr ulo- ulos ulsa ulua ulul ulus uofa uofl uofo uor- upal upar upas upla uplo upor upos uppa uppp uppu upra upsa upup ural urao urap uras urau urfa urff urla urls uro- uroa urol uroo urpo urra ursa urso urss ursu urup urur urus us-a usaa usaf usal usap usar usas usfa usfl usfs uslp uslu usos uspa uspo uspp usps usra ussa ussf ussr usss ussu usua usul usus uulu uuuu