bbbbbb beebee beebem beeker beembe beemer beerme bekker berbee berber bereke berere berker berrer berube beumer beurre breere brekke bremer bremke breuer brubru bruker bruree bubber bububu bukkur bukuru bumbee bummer burbur burree burrer buruku eburru eburum eebree ekerem embree embrue emeere emmure erbree kebber keeker kembe kember kemmer kerber kereru kerker kerkuk keuruu kreker kremer krume kubeer kukere kum-bu kumbuk kumbum kumbur kumkum kummer kurmuk kurree kurume kururu mbembe meeker member membre mememe memere merkem merker merkur mermer merrem merure mukuru mummer murmur murree muumuu rebuke reeker rekkem remeue reubke reuere rubbee rubber rubrum rumbek rumber rumbur rumker rummer rurkee