mrkr mrmc mrml mrrc mruk mube muc- mucc muce much muck mucu muee muel muhr muhu muke mule mulk mull mulm mulu mume mumm mumu murc mure murk murl murr muru rbbb rbbr rbcl rble rbmk rcbc rccb rccc rchb rchm rcle rebb rebe rebk rebu recc rece rech reck recm recr recu reeb reek reel reem rehb rehe rehm reke relb rele rell relm reme rere reru reue reuk reul reuu rhce rhcm rheb rhee rhem rhue rhum rlee rleu rlml rmll rrkm rrle rrmc rrrr rrum rubb rube rubu ruce ruch ruck ruel ruer ruhe ruhh ruhl ruhm ruhr ruke rukh rukk ruku rule rulk rull rumb rume ruml rumm rurc rure ruru ubbe ubek uber uble ucbc ucel uche ucmc ucrc uele uell uhcl uher uhle uhuh ukcc ukek ukeu ukrc ukum ukur ulbc ulcc ulch uleb ulee ulek ulle ullr ulme ulmu uluk ulul ulum umb- umbe umec umer urbe urch ure- ureh urke urle urre urrh uruk urum urur uulu uuuu