-tree bbbee be-er be-ro beber bebot becco beebe beeft beete beffe befoe befor beofe beoff beote berbe berec beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bo-bo bobet boboc bobr bobre bocce bocet bocor boece boero bofet boffo booce booco booer boore boort borbo borce borec boree borer boret boro- boroo borot borre borro botet botro botte brece breef breer breet breo- breoc brere breto brett brobo broce broer broft broto brrrr btc-e btr-t c-cor c-tec cbeff cbeft ccccc ccett cebec ceber ceco- ceere cefor ceoce ceoor cerc- cerce cerco cerec cerer ceret cero- ceroc cerre cerro certe ceto- cette co-bo co-co cobbe cobot cobre cocc- cocce cocco coceo cocto coete cofer coffe cofre cooee cooer coore coote corbe corbo corce core- coree corer corfe corfo coro- corot corre corte corto coter cott- cotte cotto crebe crece creer creft creo- creot crete croce croco croft crooe croot crore crote crott ctree cttee ebber ebbet ebert ecoff ectfe ecto- ector ectot eeeee efere efetf effer effet efore efter eofor eorre erbbe erber erect erere eroor erore eroto error erte erter etete etoro etree etter febre feeor feere fefor feoff ferce feret ferr- ferre ferro ferte feter feto- fetor fette focer foore foote force fore- foreo foret forro forte forto fotte freer freet frere frett frobe froot frore frote ftrtt o-fer o-r-b obbet obert obete oboro obote obreb ocftc ocoee ocote ocr-b ocree octet octo- octor oeco- offer offof offre offto ofoto ofter oo-er oocre ooooo orbec orbot orcet oreco oreo- orere orero orfeo orfoe orfor orobe orobo oroco oroer orret orter ortet ortoo otcbb otere otero otoce ototo otter r-co- rebbe rebec reber rebet recce recco recet rect- recte recto reece reefe reeft reere refco refer refet reffe reffo rere- reree reret rerob retee reter retro rette retto ro-ro robbe robbo robec rober robo- robor robot robrt robte rocco rocor roero roffe rofor rooer roofe rooft roore roote rorer roteb roter roto- rotor rotot rotte rotto tbtbt tcobb teber tebet tectb tefe teoco terce terco teret teror terre terro tert- teter tetr- tetro tette to-be tobbe tober tobet tobor tobot tobre tocco toco- toece toeof toerr toeto tofet toffo tofor tofte toobe toore torbe torce toreo toret torob torre torro torte torto toter toto- totoe totoo totte trboc treco treer treet trefe treff trere trete trett troco troee trofe troff troft trott ttttt