-tree bbbee bccup be-er beber becue becut beebe beete beeut beppe beppu berbe bercu berec beret berre berru berte betee beter betre bett- bette beuer beure beute brebu brece breer breet brere brett breu- brrrr bruce bruer bruet brute btc-e btr-t bubbe buber bucet bucur burcu buret burru burte burtt buruc burut butec buter butte butut c-p-c c-tec ccccc ccett cebec ceber cebpb cebpe ceere cepet cerbu cerc- cerce cerec cerer ceret cerre certe cette cpctc crebe crece creep creer crepe crept crepu crete cretu creu- creue creup cruce cruet crupe crure cteep ctree cttee cubbe cubeb cuber cubub cueup cuper cupr- curce curer curet curre curup cutcu cutee cuter cutup ebber ebbet ebert ebure eccup eeeee eepee eperc epptb epure erbbe erber erect erept erere errtu erte erter eruct erupt etete etree etter eturu eucre eurre p-rep pcept pcert pctct pebre peebu peece peere peert peete pepee peppe pept- pepup perce perec perer peret perre perte peruc perur petbe petcu peter petr- petre petru pette petur peuce peure prece prete pruce prute ptcrb pter- ptere ptprb ptprc ptpre ptprr ptprt ptpru puber puett pupet puppe purce puree purer purre purte puter putre putt- putte puttu putup re-up rebbe rebec reber rebet rebut recce recep recet recpt rect- recte recue recur recut reece reepe reere repec repet reppe reprt repub reput rere- reree reret retee reter rette reuer reuet reute rubee ruber rubup rucer ruere ruete rupee ruper rurec ruter rutte ruutu tbtbt tbutt teber tebet tectb teepe teeup tepee tepet tepeu teppu terce teret tereu terre tert- teter tetr- tette treer treet trepp trept trere trete trett treut trubu truce truer trupt trute ttttt tuber tucep tucet tuctu tupee turbe turbt turet turre turtu turup turut tutee tutte tuuru u-cee uber- upc-e upcut upeet upper upput upter urter urubu uruce urucu urupe urutu uter- utter uttur utube uturu uuuuu