bbbee be-er be-ro beber becco beebe berbe berec berob beroe beror berre bo-bo boboc bobr bobre bocce bocor boece boero booce booco booer boore borbo borce borec boree borer boro- boroo borre borro brece breer breo- breoc brere brobo broce broer brrrr c-cor ccccc cebec ceber ceco- ceere ceoce ceoor cerc- cerce cerco cerec cerer cero- ceroc cerre cerro co-bo co-co cobbe cobre cocc- cocce cocco coceo cooee cooer coore corbe corbo corce core- coree corer coro- corre crebe crece creer creo- croce croco crooe crore ebber eeeee eorre erbbe erber erere eroor erore error o-r-b oboro obreb ocoee ocr-b ocree oeco- oo-er oocre ooooo orbec oreco oreo- orere orero orobe orobo oroco oroer r-co- rebbe rebec reber recce recco reece reere rere- reree rerob ro-ro robbe robbo robec rober robo- robor rocco rocor roero rooer roore rorer