-tree b-r-k bbbee be-er bebek bebel beber beebe beeke beele beete beeut beeve beker bekke belee belek belet bellb belle belue belur belut berbe berek berel beret berk- berke berle berre berru berte betee betel beter betke betle betre bett- bette betul beuer beule beure beute beuve bevel bever bevke bevue bleek bleer bleet bleke blekk blere blete bleue bleve bluer bluet bluke blurb blure blurr blurt brebu breek breel breer breet breke brell brere brett breu- breve brrrr bruer bruet bruke brule brull brute btr-t bubbe buber buble buell buker buket bukk- bulb- bulke bull- bulle bulul bulut burek burel buret burke burle burru burte burtt buruk burut buter butke butle butte butut ebber ebbet ebble ebell eberl ebert eblul ebull ebure eeeee eeler eevee eever ekker ekuku ekuru eleet elele eleut eleve ellek ellel eller ellet ellul eltek elulu eluru elute elver elvet erbbe erber erere ereve erkel errtu erte ertel erter eruke eteke etete etree etrek ettel etter ettle eturu euell euler eurel eurre evell evere everr evert evete evett eveve evtek k-t-b k-tel k-ute kebbe kebek keber keble keele keere keeve kelek kelle kerek kerel keret kerle kerre kertu kerve ketek ketel keter kette kevel kever kleet klerk klett kleve kluke klute kreek kreel kreke krele krell krete kreuk krull kubek kuber kubul kukel kukle kukur kullu kulte kulul kulur kurbu kurek kurku kurlu kurre kurte kuruk kutlu kutte kuttu kutur kvell lebel leber lebet leeke leell leere leert leeve lekel lekeu leleu lelle lerer letbe letek letre lette letur leuk- leuke levee level lever levet levre lubbe luber lubke luble lubur lueve luker luket lukre lukut lulle lulte lulul lurer lurue lurve lute- lutek luter lutke lutte luver rebbe rebel reber rebet rebut reere reeve rekel rekke rekle relee relek relet relte relue rere- reree reret retee retel reter rette reuel reuer reuet reule reute revel rever revet revle revue rt-rk rtrev rubee rubel ruber rubke ruble ruele ruell ruere ruete rukel rukke ruler ruter rutle rutte rutul ruule ruutu tbtbt tbutt teber tebet tebuk teele teell tekel teket tekke tele- telek teler teleu tell- telle teluk telve terek teret tereu terre tert- terve tetel teter tetle tetr- tette tevel tevet tkkev tlell tlett tllbr trbuk treer treet trele trere trete trett treut treve trubu truel truer truke trule trull trute trutv ttttt tubek tuber tubul tuell tuelt tukul tukur tulet tulku tulle turbe turbt turek turel turet turku turle turre turtu turul turut turve tutee tutel tutku tutle tutte tuuru tvtel ubble uber- ukeke ukert ulker ullet ullur ultre ululu uluru ulver urelu urkel urker urkut urtel urter urtlu urubu urutu uter- utter uttur utube uturu uuuuu uvele uvule veber vebre veele veell veere veeve vekke vekre velet velev velle veluk velur vereb verek verel verke verre verte vertu verul verve vetel vetle vette vetuk veuve vever vreel vuele vuere vukel vulv- vulve vuver