bbbee be-er be-ro beber becco beebe beffe befoe befor beofe beoff berbe berec berob beroe beror berre bo-bo boboc bobr bobre bocce bocor boece boero boffo booce booco booer boore borbo borce borec boree borer boro- boroo borre borro brece breef breer breo- breoc brere brobo broce broer brrrr c-cor cbeff ccccc cebec ceber ceco- ceere cefor ceoce ceoor cerc- cerce cerco cerec cerer cero- ceroc cerre cerro co-bo co-co cobbe cobre cocc- cocce cocco coceo cofer coffe cofre cooee cooer coore corbe corbo corce core- coree corer corfe corfo coro- corre crebe crece creer creo- croce croco crooe crore ebber ecoff eeeee efere effer efore eofor eorre erbbe erber erere eroor erore error febre feeor feere fefor feoff ferce ferr- ferre ferro focer foore force fore- foreo forro freer frere frobe frore o-fer o-r-b oboro obreb ocoee ocr-b ocree oeco- offer offof offre oo-er oocre ooooo orbec oreco oreo- orere orero orfeo orfoe orfor orobe orobo oroco oroer r-co- rebbe rebec reber recce recco reece reefe reere refco refer reffe reffo rere- reree rerob ro-ro robbe robbo robec rober robo- robor rocco rocor roero roffe rofor rooer roofe roore rorer