-tree bbbee be-er bebel beber beebe beele beete beeut belee belem belet bellb belle belue belum belur belut bembe bemer bemet berbe berel beret berle berme berre berru berte berum betee betel beter betle betre bett- bette betul beuer beule beure beute bleer bleet blere blete bleue bluer bluet blume blurb blure blurr blurt brebu breel breem breer breet brell breme bremm brere brett breu- brmmm brrrr bruer bruet brule brull brume brumm brute btr-t bubbe buber buble buell bulb- bull- bulle bulul bulut bumbu bumme burel buret burle burru burte burtt burut buter butle butme butte butut ebber ebbet ebble ebell eberl ebert eblul ebull ebure eeeee eeler eleet elele eleme eleut ellel eller ellet ellul elmer elmet elulu eluru elute embee embel ember emble embue emeer emele emell emere emerl emert emmer emmet emtee emtel emule emure erbbe erber erem- erere errtu erte ertel erter etete etree ettel etter ettle eturu euell euler eum-u eumel eurel eurre lebel leber lebet leell leeme leere leert leleu lelle lemel lemer lemme lemur lerer lerum letbe letem letme letre lette letur lmule lubbe luber luble lubur lulle lulte lulul lumb- lumbe lumer lumet lumle lumme lumut lurer lurue lute- luter lutte lutum m-tel mbebe mbere mbret mbube mbule mbulu mburu mebbe meble meele meell meemu meere meete melbu melee melem melet mell- melle melte melub melur melut membe memel memer merel merer meret merle merre merte merul merur metel meter metle metr- metre mette metur meuer meule meure meute mlete mmmmm mreru mrlee mrmet mt-lb mt-te mt-tm mt-tr mt-tt mtree mttle mtume muble muler mulet mulle mult- multe mulur mumbe mumle mumlu mumme mummu muret mureu murle murre murru murum murut muter mutet mutlu mutum rebbe rebel reber rebet rebut reeme reere relee relet relte relue remee remel remer remet remue rere- reree reret rerum retee retel retem reter rette reuel reuer reuet reule reume reute rmutt rubee rubel ruber ruble ruele ruell ruere ruete ruler rumbe rumer rummu ruter rutle rutte rutul ruule ruutu tbtbt tbutt teber tebet teele teell teeme teemu tele- telem teler teleu tell- telle tembe tembu temel terem teret tereu terme terre tert- tetel teter tetle tetr- tette tlell tlett tllbr tlmer treer treet trele treme trere trete trett treut trubu truel truer trule trull trume trute ttttt tuber tubul tuell tuelt tulem tulet tulle tulum tumbe tumbu tumul tumut turbe turbt turel turem turet turle turre turtu turul turut tutee tutel tutle tutte tuuru ubble uber- ubume ullet ullur ulmer ulmet ulrum ultre ululu uluru umbe- umbel umber umble umblu umbre umeer umeme umlet urelu ureme urtel urter urtlu urubu urutu uter- utmer utrum utter uttur utube uturu uuuuu