-tree b-r-k bbbee be-er bebek beber beebe beeke beene beete beeut beken beker bekke bene- benet benke benne bennu benue benuk benun benur benut berbe berek beren beret berk- berke berne bernt berre berru berte berun betee beten beter betke betne betre bett- bette beuer beure beute brebu breek breen breer breet breke brene brenk brenn brent brere brett breu- brrrr bruen bruer bruet bruke brune brunk brunn brunt brute bruun btr-t bubbe buben buber buker buket bukk- buknu bunke bunne bunte bunuk bunun bunut burek buren buret burke burn- burne burnt burru burte burtt buruk burun burut buten buter butke butte butut e-ten ebber ebbet ebene ebern ebert ebner ebure eeeee eener eenet eeten ekene ekker ekren ekuku ekuru enbun enent enete enker enku ennet enrut enten enter entre enure enurn erbbe erben erber ereen erere ernen ernet errtu erte erter ertun eruke eteke etern etete etnre etree etrek etrun etten etter eturu eunet eurre k-t-b k-ute kebbe kebek keben keber keene keere kenet kenku kenne kente kerek keren keret kerne kernu kerre kertu ketek keten keter kette kneen knete knurr knute kreek kreke krenn krete kreuk krunk kruun kubek kuben kuber kukur kunek kunen kuner kunku kunne kunur kurbu kurek kuren kurku kurne kurre kurte kuruk kutte kuttu kutur nebek neber nebet nebtu neere neetu neker nente neree neret nerre nerte nerur neten netne nette neuen neuer neueu neune neur- neure nkubu nnebe ntete nu-nu nuker nunet nunun nure- nurek nuruk nurun nutte nutuk rebbe reber rebet rebun rebut reene reere reken rekke rekne rekun renee rener renet renke renku renne rente rere- reree reret rerun retee reter retnr rette reuen reuer reuet reune reute rt-rk rtenn rubee ruben ruber rubke ruere ruete rueun ruken rukke runer runet runne runte ruten ruter rutte ruutu t-nut tbtbt tbutt teber tebet tebuk teken teket tekke tekn- ten-k tenen tener tenet teneu tenke tenne tennu tente tenue tenur terek teret tereu terne terre tert- teten teter tetr- tette tntnt trbuk treen treer treet trene trent trere trete trett treut trubu truer truke trunk trute ttnet ttttt tubek tuber tuene tukne tukur tune- tuner tunku tunne turbe turbt turek turen turet turku turn- turne turnt turnu turre turtu turut tutee tutku tutte tutun tuuru ubeen uber- ueken ukeke ukert unbet unete unken unker unket unkur unnet unnun unnur unnut unrun unten unter unurn urent urker urkun urkut urter urubu urutu utenn uter- utter uttur utube uturn uturu uunet uuuuu