bbbee be-er be-ro beber beebe beeri beffe befie befoe befor befur beibi beier beife beire beofe beoff beoir beour berbe berei berie berio beriu berob beroe beror berre berri berru beuer beure bibbe bibbo biber bibie bibio bibri biebe biefe biere bieri bifer biffi biffo bifor biore bioue birie birou birur biure bo-bo bobbi bobr bobre bobri boero boeuf boeur boffi boffo boibe boier boire boiro booer boore booru borbo boree borer borio boro- boroo borou borre borro bouee bouer boure bouri brebu breef breer breo- brere breu- bribe brief brier brifu briou brobo broer broue brrrr bruer bruff bruiu bruri bubbe buber buffe buffi buffo buire burfi burie burio buroo burri burro burru ebber ebbie ebibe eboue ebrio ebure eeeee eerie efere eferi effer effie effio efore efrei efuru eieio eirie eofor eorre erbbe erber erere erier eriff erio- eroor erore error eubie eubro euro- eurre febio febre feeor feere fefor feier feoff ferie ferio ferr- ferre ferri ferro feuer fiber fibr- fibre fibro fieee fieri fiero fifer fifie fiore fiori firee firei firer firie firou firre foir- foire foore fore- foreo forio forro forur fouee fourb foure fouro freei freer freir frere freur frier frobe frore fu-fu fuero furbo furie furio furir furo- furor i-beo ibbur ibeof ibero ibibo ibore ieiri ierei ieroe if-- ifere iffou iiiee iiiii ioffe ioooi ioooo iorio irobo irori irour iurie o-fer o-r-b obeie oboro oboue obreb oeiro offer offie offir offof offre ofori ofour oo-er ooioo ooooo oorie orebi oreo- oreoi orere orero orfei orfeo orfeu orfoe orfor oribe oribi orobe orobo oroer orube oruro ouir- ouoro oure- ourie rebbe reber reefe reere refer reffe reffo reiff rere- reree rerir rerob reuer reuir ri-fi ribbi riber ribie ribo- riefe rifer riife ririe riuer ro-ro robbe robbi robbo rober robie robo- robor robur roero roffe rofor rooer roofe roore rooue rorbu rorer rouer roufe roure rubbi rubee ruber rubie rubio rubof rubor ruere ruffe ruffo rufi- rufie rufio rufo- ruiru uber- ubirr ubobo ufere uffie ufofu uforb uiro uouee ureo- uribe uroob urour urubu ururi uuuuu