bbbee be-er be-ro beber beebe bembe bembo bemer beour berbe berme bermo berob beroe berom beror berre berru berum beuer beure bo-bo bobr bobre boeme boero boeur bombe bombo bomer bomme booer boomb boore booru borbo boree borer bormo boro- borom boroo borou borre borro borum bouee bouer boure brebu breem breer breme bremm bremo breo- brere breu- brmmm brobo broer brom- brome bromo broom broue brrrr bruer brume brumm bubbe buber bumbo bumbu bumme buroo burro burru ebber eboue ebure eeeee embee ember embro embue emeer emere emmer emore emure eomer eorre erbbe erber erem- eremo erere erome eroom eroor erore error eubro eum-u euro- eurre mbebe mbere mboro mbube mburu mebbe meebo meemu meere membe memer memor merer mero- meroe merom meroo meror merre merur meuer meure meuro mmmmm mobee mobme mobor mobro moeer moeme moere moero mombo mombu momme momoe mooer moore mooro morbo moree morem morer mormo moror morou morre morro morue morum moure mreru mrmom mrorr mumbe mumbo mumme mummu mureu murom muror murre murro murru murum o-r-b oboro oboue obreb obrom oerme oerum ombe- omber ombre omemo omero omore omoro oo-er ooooo orbom oreo- orere orero ormer ormur orobe orobo oroer orome oromo orrum orube oruro oueme oumer ouoro oure- rebbe reber reeme reemo reere remee remer remor remou remue reome rere- reree rerob rerum reuer reume ro-ro robbe robbo rober robo- robor robur roero rombe romeo romer romme rooer roome roomu roore rooue rorbu rorem rorer rouer roume roumm roure rubee ruber rubor ruere rumbe rumbo rumer rummo rummu rumor ruomu uber- ubobo ubume umbe- umber umbre umbro umeer umeme umore umour uouee ureme ureo- uroob urour urubu uuuuu