raca racc race raco racu raec rael raer rala ralb rale rall ralo raob raoc raol rara rarb rare raro raua raub rauc raue raul rbbb rbbr rbcl rble rcac rcbc rcbo rccb rccc rcle rea- reac reae real reao rear reau reba rebb rebe rebo rebu reca recc rece recr recu reeb reel rela relb rele rell relo reol reou rera rere rero reru reue reul reuu rlab rlee rleu rlua roab roar rob- roba robb robe robo robu roca rocc roce roco roea roel roer rola role roll rolo roob rool roor rora rorc rore roro roru roua roub roue roul rrle rrrr ruba rubb rube rubu ruca ruce ruel ruer rula rule rull rulo rura rurc rure ruro ruru uabc uaca uaoc uarc uaru uaua ubac ubal ubar ubba ubbe ubbo uber ubla uble ublo uboc ubra ucal ucar ucbc ucca ucea ucel ucla ucrc ucua ueba uele uell ulaa ulae ular ulbc ulcc ulco ulea uleb ulee uleo ulla ulle ullo ullr ulo- uloc ulua ulul uocc uolc uor- uore urac ural urao urau urba urbe urca ure- urea urla urle uro- uroa urol uroo urra urre urur uulu uuoc uuuu