bbbee be-er be-ro beber bebog beebe begee begge begob begor begue begur beour berbe bereg berge berob beroe beror berre berru beuer beure bo-bo bobr bobre boege boero boeur boger bogge bogoe bogor bogu bogue bogur booer boore booru borbo boree borer borge borgo borgu boro- boroo borou borre borro bouee bouer bouge boure bourg brebu breer breg- brege bregg breo- brere breu- brobo broer broue brrrr bruer bruge brugg bubbe buber buger bugge bugoo bugre burge burgo burgu buroo burro burru ebber eberg eboue ebure eeeee egger eorre erbbe erber erege erere ergo- eroge eroor erore error erugo eubro euro- eurre gberg gberu geber gebre gebur geebo geere gegge georg gerbe gerbo gerre go-go go-oo gobbe gobbo gobeo gogro gogue goobo googe goore gorbe goree gorer gorge gorgo gorre gouge goure grebe grebo greer grege gregg grego grgur groge grogg groue grrrr grubb grube grure gubbe gubbo guber gubru guere guero guoge gurge guroo gurre gurro gurur o-r-b obegu oberg oboro oboue obreb ogogo ogugu oo-er ooooo oreo- orere orero orgue orobe orobo oroer orrgo orube oruro ouoro oure- rebbe rebeg reber reege reere reger regge reggo regur reorg rere- reree rerob reuer ro-ro robbe robbo rober robo- robor robur roero roger rogge rogue rooer rooge roore rooue rorbu rorer rouer rouge roure rubee ruber rubor ruegg ruere ruger rugge uber- ubobo ugro- ugrug uouee ureo- urger uroob urour urubu uuuuu