rill rilu rina rinn riri rlab rlin rlua rnai rnal rnbr rnin rnli rrna rrrr rrun ruan ruba rubb rubi rubu ruca ruci ruin rula rull runa runc runi runn rura rurc ruri ruru ruun uabc uaca uair uarc uaru uaua ubac ubal ubar ubba ubbi ubic ubii ubir ubla ubli ubra ucai ucal ucan ucar ucbc ucca ucci ucil ucin ucla ucrc ucua uica uira uirr ulaa ulai ulan ular ulbc ulcc ulic ulla ulli ullr ulna ulua ulul unaa unac unai unal unan unar unau unca uncc unci uncl uni- unia unic unii unin unir unna unni unra urac urai ural uran urau urba urbi urca urci uria urib uric urin uriu urla urna urni urra urri urun urur uulu uuni uuri uuuu