-tree bbbee be-er beber beebe beene beete bence bene- benet benne berbe berec beren beret berne bernt berre berte betee beten beter betne betre bett- bette brece breen breer breet brene brenn brent brere brett brrrr btc-e btr-t c-tec ccccc ccett ccnet cebec ceber ceene ceere cence cent- centr cerc- cerce cerec ceren cerer ceret cerne cerre certe ceten cette cnnnn cntrc crebe crece creen creer cren- crete crnce crnec crner cten- ctene ctree cttee e-ten ebber ebbet ebene ebern ebert ebner eccen eeeee eence eener eenet eeten encre enent enete ennet enten enter entre erbbe erben erber erect ereen erere ernen ernet erte erter etern etete etnre etree etten etter ncree neber nebet necr- nect- neece neere nente neree neret nerre nerte neten netne nette nnebe ntete rebbe rebec reber rebet recce recen recet rect- recte reece reene reere rence renee rener renet renne rente rere- reree reret retee reter retnr rette rtenn tbtbt teber tebet tecn- tectb tenbc tencc tence tenen tener tenet tenne tente terce teret terne terre tert- teten teter tetr- tette tntnt treen treer treet trenc trene trent trere trete trett ttnet ttttt