-tree bbbee bbqer be-er beber beebe beete beeut beque berbe beret berre berru berte betee beter betre bett- bette beuer beure beute brebu breer breet brere brett breu- brrrr bruer bruet brute btr-t bubbe buber buret burru burte burtt buruq burut buter butte butut ebber ebbet ebert ebure eeeee erbbe erber erere errtu erte erter etete etree etter eturu eurre q-tee qbert queeb queer queet quere quert quete queue qureq quruq qutub quurt rebbe reber rebet rebut reere reque rere- reree reret retee reter rette reuer reuet reute rubee ruber ruere ruete ruter rutte ruutu tbtbt tbutt teber tebet teret tereu terre tert- teter tetr- tette treer treet trere trete trett treut trubu truer trute ttttt tuber tuqtu tuque turbe turbt turet turre turtu turuq turut tutee tutte tuuru uber- urter urubu urutu uter- utter uttur utube uturu uuuuu