bbbee be-er be-ro beber becco becue beebe beour berbe bercu berec berob beroe beror berre berru beuer beure bo-bo boboc bobr bobre bocce bocor boece boero boeur booce booco booer boore booru borbo borce borec boree borer boro- boroo borou borre borro bouce bouee bouer boure brebu brece breer breo- breoc brere breu- brobo broce broer broue brrrr bruce bruer bubbe buber bucco buceo bucur burcu buroo burro burru buruc c-cor ccccc cebec ceber ceco- ceere ceoce ceoor cerbu cerc- cerce cerco cerec cerer cero- ceroc cerou cerre cerro co-bo co-co cobbe cobre cobue cocc- cocce cocco coceo cocur coeur cooee cooer coore corbe corbo corbu corce core- coree corer coreu coro- corre couco couer courb coure couru crebe crece creer creo- creu- creue croce croco crooe crore cruce cruor crure cubbe cubeb cuber cubo- cubub cuero cuoco cuore curce curer curre curro ebber eboue ebure eeeee eorre erbbe erber erere eroor erore error eubro eucre euro- eurre o-r-b oboro oboue obreb occur ocoee ocr-b ocree oeco- oo-er oocre ooooo orbec oreco oreo- orere orero orobe orobo oroco oroer orube oruce oruro ouoro ource oure- r-co- rebbe rebec reber recce recco recue recur reece reere rere- reree rerob reuer ro-ro robbe robbo robec rober robo- robor robur rocco rocor rocou roero rooer roore rooue rorbu rorer rouer roure rubee ruber rubor rucer ruere rurec u-cee uber- ubobo ucero uouee ureo- uroob urour urubu uruce urucu uuuuu