bbbee be-er be-ro beber bebop beebe beour bepop beppe beppo beppu berbe berob beroe beror berre berru beuer beure bo-bo bobr bobre bobup boero boeur booer boore booru borbo boree borer boro- boroo borou borre borro borup bouee bouer boure brebu breer breo- brere breu- brobo broer broue brrrr bruer bubbe buber buroo burro burru e-pro ebber eboue ebure eeeee eepee eorre epure erbbe erber erere eroor erore error eubro euro- europ eurre o-r-b oboro oboue obreb oeppo oo-er ooooo opepe opere opobo opper oreo- orere orero orobe orobo oroer orube oruro ouoro oure- p-rep pebre peebo peebu peere pepee peppe pepup perer perou perre perro perur peure po-po pobe pooer poope poopo poore poper popop poppe poppo popup poreb porer poro- porro porur pouer poupe poure preop probe probo proer proor prop- prope propp propr prore puber pubo- puero puppe puppo puree purer puro- purre re-up rebbe reber rebop reepe reere repop repor reppe repro repub rere- reree rerob reuer ro-ro robbe robbo rober robo- robop robor robur roero rooer roope roore rooue roper roppe rorbu rorer rouer roure rprop rubee ruber rubor rubup ruere rupee ruper u-pop uber- ubobo uouee upper ureo- uroob urour urubu urupe uuuuu