-tree bbbee be-er beber beebe beeft beene beete beffe bence bene- benet benfe benne berbe berec beren beret berne bernt berre berte betee beten beter betne betre bett- bette brece breef breen breer breet brene brenn brent brere brett brrrr btc-e btr-t c-tec cbeff cbeft ccccc ccett ccnet cebec ceber ceene ceere cence cent- centr cerc- cerce cerec ceren cerer ceret cerne cerre certe ceten cette cnnfn cnnnn cntrc crebe crece creen creer creft cren- crete crnce crnec crner cten- ctene ctree cttee e-ten ebber ebbet ebene ebern ebert ebner eccen ectfe eeeee eence eener eenet eeten efere efetf effer effet efnet efren eften efter encre enent enete enfce enfer ennet enten enter entre erbbe erben erber erect ereen erere ernen ernet erte erter etern etete etnre etree etten etter fcent febre feere fence fener fenne ferce feren feret ferr- ferre ferte feter fette freer freet frere frett ftrtt ncree neber nebet necr- nect- neece neere nefen nefer neffe nefre nefte nente neree neret nerre nerte neten netne nette nnebe nnfcc ntete rebbe rebec reber rebet recce recen recet rect- recte reece reefe reeft reene reere refen refer refet reffe refne rence renee rener renet renfe renne rente rere- reree reret retee reter retnr rette rtenn tbtbt teber tebet tecn- tectb tefe tefen tenbc tencc tence tenen tener tenet tenne tente terce teret terne terre tert- teten teter tetr- tette tntnt treen treer treet trefe treff trenc trene trent trere trete trett ttnet ttttt