rapi rapp rara rarb rari raua raub rauc raun raup rbbb rbbr rcac rcbc rccb rccc rcic rcnr rcpi riaa riab riai rian riau rib- riba ribu rica ricc riia riin rina rinn ripa ripi ripp ripr riri rnai rnbr rncp rnin rpca rpii rppn rrna rrrr rrun ruan ruba rubb rubi rubp rubu ruca ruci ruin runa runc runi runn rupa rupp rura rurc ruri rurp ruru ruun u-rp uabc uaca uair uarc uaru uaua ubac ubar ubba ubbi ubic ubii ubir ubpc ubra ucai ucan ucar ucbc ucca ucci uccp ucin ucpa ucpb ucrc ucua uica uipi uira uirr unaa unac unai unan unar unau unca uncc unci uncp uni- unia unic unii unin unir unna unni unpa unpc unra upac upar upca upci upic upin upnp uppa uppc uppp uppu upra upri upup urac urai uran urap urau urba urbi urca urci uria urib uric urin uriu urna urni urra urri urun urup urur uucp uuni uuri uuuu