bbbee be-er be-ro bebel beber beblo beebe beele belbo belee bellb belle bello belue belur beour berbe berel berle berlo berob beroe berol beror berre berru beuer beule beure bleer blere bleue bloor blorb blore bloue bluer blurb blure blurr bo-bo boble bobr bobre boeol boero boeur bolbe bolel boleo boler boll- bolle bollo bollu booer boole boore booru borbo boree borel borer borle boro- boroo borou borre borro borul bouee bouel bouer boul- boule boulo boure brebu breel breer brell brelo breo- brere breu- brobo broer brole broll brolo brool broue brrrr bruer brule brull bubbe buber buble buell bulb- bull- bulle bulou bulul burel burle burol buroo burro burru ebber ebble ebell ebelo eberl eblul eboue ebull ebure eeeee eeler elele eleo- ellel eller elloe ellul eloee elole eloor elore eloro elrob elubo elulu eluru eorre erbbe erber erere eroor erore errol error eubro euell euler eurel euro- eurre lebel leber leell leere leleu lelle lerer leuro lobbe lobbo lober loble lobo- lobor loler lollo lolol loobu looer loore lorel loreo lorer lorre louer loule loure louro lubbe luber luble lubur luebo lulle lulul lurer lurue o-r-b obele obole obolo oboro oboue obreb oerel oerle oleo- olere olleo oller ollur olour oo-er ooooo orble orell oreo- orere orero orobe orobo oroer orolu orube oruro oullo ouoro oure- ourol rebbe rebel reber rebol reere relee rello relue rere- reree rerob reuel reuer reule ro-ro robbe robbo rober roble robo- robor robur roell roero roleo rolle rollo rooer roole roore rooue rorbu rorer rouer roule roull roure rubee rubel ruber ruble rubor ruele ruell ruere ruler rullo ruule ubble uber- ubobo ullur ululu uluru uouee urelu ureo- uroob urour urubu uuuuu