murr muru raab raad raam raba rabb rabe rabu rac- raca racc race racu rada radc radd rade radm radr radu raec raed raer rama ramb rame ramm ramu rara rarb rare raua raub rauc raud raue raum rbbb rbbr rcac rcbc rccb rccc rcdc rcde rcrd rdac rdbm rdcm rder rdma rea- reac read reae ream rear reau reba rebb rebe rebu reca recc recd rece recm recr recu reda redc redd rede redr redu reeb reed reem rema reme rera rerd rere reru reue reuu rrad rred rrmc rrrr rrum ruad ruba rubb rube rubu ruca ruce ruda rudd rude rued ruer ruma rumb rume rumm rura rurc rurd rure ruru ruud uabc uaca uamc uarc uaru uaua ubac ubar ubba ubbe uber ubra ubud ucad ucam ucar ucbc ucca ucdc ucdd ucea ucmc ucrc ucua udaa udad udar udau udbc udca udea udem uder udma udmc udra ueba ueda umaa umac umar umb- umba umbe umde umec umer umma umra urac urad urau urba urbe urca urda urde urdu ure- urea ured urma urra urre urum urur uuuu