-tree bbbee be-er be-ro beber bebot becco becue becut beebe beete beeut beote beour berbe bercu berec beret berob beroe beror berre berru berte berto betee beter betoo betor betou betre bett- bette betto beuer beure beute bo-bo bobet boboc bobr bobre bocce bocet bocor boece boero boeur booce booco booer boore boort booru borbo borce borec boree borer boret boro- boroo borot borou borre borro borut botet botou botro botte bottu bouce bouee bouer bouet boure boute bouto brebu brece breer breet breo- breoc brere breto brett breu- brobo broce broer broto broue brout brrrr bruce bruer bruet brute btc-e btr-t bubbe buber bucco buceo bucet bucur burcu buret buroo burro burru burte burtt buruc burut butec buteo buter buto- butor butot butou butte butuo butut c-cor c-tec ccccc ccett cebec ceber ceco- ceere ceoce ceoor cerbu cerc- cerce cerco cerec cerer ceret cero- ceroc cerou cerre cerro certe ceto- cette co-bo co-co cobbe cobot cobre cobue cocc- cocce cocco coceo cocto cocur coete coeur cooee cooer coore coote corbe corbo corbu corce core- coree corer coreu coro- corot corre corte corto coter cott- cotte cotto cottu couco couer courb coure court couru couto coutu crebe crece creer creo- creot crete cretu creu- creue croce croco crooe croot crore crote crott crout cruce cruet cruor crure ctree cttee cubbe cubeb cuber cubo- cubot cubub cuero cueto cuoco cuore curce curer curet curre curro curto cutco cutcu cutee cuter cutro cutto ebber ebbet ebert eboue ebure ecto- ector ectot eeeee eorre erbbe erber erect erere eroor erore eroto error errtu erte erter eruct etete etoro etour etree etter eturu eubro eucre euro- eurre o-r-b obbet obert obete oboro obote oboue obout obreb occur ocoee ocote ocr-b ocree octet octo- octor oeco- oo-er oocre ooooo orbec orbot orcet oreco oreo- orere orero orobe orobo oroco oroer orout orret orter ortet ortoo orube oruce oruro orutu otcbb otere otero otoce ototo otour otter ottur oture oubut ouert ouoro ource oure- outer outre outro outto r-co- rebbe rebec reber rebet rebut recce recco recet rect- recte recto recue recur recut reece reere rere- reree reret rerob retee reter retro rette retto reuer reuet reute ro-ro robbe robbo robec rober robo- robor robot robrt robte robur rocco rocor rocou roero rooer roore roote rooue rorbu rorer roteb roter roto- rotor rotot rotte rotto roubt rouer rouet roure route routt rubee ruber rubor rucer ruere ruete rurec ruter rutte ruutu tbtbt tbutt tcobb teber tebet tecou tectb teoco terce terco teret tereu teror terre terro tert- teruo teter tetr- tetro tette teuto to-be tobbe tober tobet tobor tobot tobou tobre tocco toco- tocut toece toerr toeto toobe toore torbe torce toreo toret torob torre torro torte torto tortu torue toter toto- totoe totoo totte toure touro toute trboc treco treer treet trere trete trett treut troco troee trott troue trout trubu truce truco truer truro trute ttttt tuber tubo- tubou tucet tuctu tuero tuotu turbe turbo turbt turco turet turoc turot turre turro turtu turut tutee tuteo tutor tutte tutto tuuru u-cee uber- ubobo ucero uouee ureo- uroob urour urter urubu uruce urucu urutu utebo uter- utero utro- utror utter uttur utube uturu ututo uuuuu