bbbee be-er beber becue becum beebe bembe bemer berbe bercu berec berme berre berru berum beuer beure brebu brece breem breer breme bremm brere breu- brmmm brrrr bruce bruer brume brumm bubbe buber bucum bucur bumbu bumme burcu burru buruc ccccc cebec ceber cecum ceere cemec cemre cerbu cerc- cerce cerec cerer cerre cmere crebe crece creem creer creme creu- creue cruce crumb crume crure cubbe cubeb cuber cubub cumbe cumbu cumec cumm- curce curer curre ebber ebure ecume eeeee eembc embee ember embue emcee emeer emere emmer emure erbbe erber erem- erere eucre eum-u eurre mbebe mbere mbube mburu mcbee mccue mcree mcube mebbe mecum meece meemu meere membe memer merce merer merre merur meuer meure mmccc mmmcc mmmmm mrcub mreru mucum mucur mumbe mumcu mumme mummu mureu murre murru murum rebbe rebec reber recce recue recur reece reeme reere remee remer remue rere- reree rerum reuer reume rubee ruber rucer ruere rumbe rumer rummu rurec u-cee uber- ubume umbe- umber umbre umeer umeme ureme urubu uruce urucu uuuuu