olur ooaa ooak ooba oocr ooku oola oolo oooo oora orab orac orak oral orao orar orba orbb orbo orbu orca orco orka orko orla orlo orlu oro- orok oror orra orro orub ouac oucc oula oulk oulu our- oura ouro ouu- raab raak raba rabb rabk rabl rabo rabu rac- raca racc rack raco racu raka rakk raku rala ralb rall ralo raob raoc raok raol rara rarb rark raro raua raub rauc rauk raul rbbb rbbr rbcl rcac rcbc rcbo rccb rccc rlab rlua roab roak roar rob- roba robb robo robu roca rocc rock roco roka rokk roko rokr roku rola rolk roll rolo roob rook rool roor rora rorc rork roro roru roua roub rouk roul rrrr ruba rubb rubu ruca ruck ruka rukk ruku rula rulk rull rulo ruok rura rurc ruro ruru uabc uaca uaoc uarc uaru uaua ubac ubal ubar ubba ubbo ubla ublo uboc ubra ucak ucal ucar ucbc ucca ucka ucla ucrc ucua ukba ukcc ukko ukla ukok ukra ukrc ukur ulaa ular ulbc ulcc ulco ulla ullo ullr ulo- uloc ulua uluk ulul uocc uolc uor- urac ural urao urau urba urca urka urla uro- uroa urok urol uroo urra uruk urur uulu uuoc uuuu