bbbee be-er beber becue beebe beeve berbe bercu berec berre berru beuer beure beuve bevce bever bevue brebu brece breer brere breu- breve brrrr bruce bruer bubbe buber bucur burcu burru buruc buvce ccccc cebec ceber ceere cerbu cerc- cerce cerec cerer cerre crebe crece creer creu- creue creve cruce crure cruve cubbe cubeb cuber cubub curce curer curre curve cuvee cvrce ebber ebure eeeee eevee eever erbbe erber erere ereve eucre eurre evere everr eveve rebbe rebec reber recce recue recur reece reere reeve rere- reree reuer rever revue rubee ruber rucer ruere rurec u-cee uber- urubu uruce urucu uuuuu veber vebre vecer veere veeve vereb verre verve veuve vevce vever vuere vuver