-tree b-e-d bbbee bd-re be-er bebed beber bedde bedee beder bedet bedub bedue bedug beebe beede beerd beete beeut begee beget begge begue begur begut berbe berde berdu bered bereg beret berge berre berru berte betee beter betre bett- bette beuer beure beute brebu bredd brede bredt breed breer breet breg- brege bregg brerd brere brett breu- brrrr brud- brude brued bruer bruet bruge brugg brute btr-d btr-t bubbe buber budde buddu budge budur buger bugge bugre burde buret burge burgu burru burte burtt burud burut buter butte butut ddddd debed deber debet debte debug debut dedde dedee deder dedur dedut deede deere degre degut derbe derde dered dereg derge derre derub derue deter detre dette detur deure deut- drdre dredd drede dredg dreed drere drude drugu dubee duded duder duere duerr duete duett durbe dured duree durer duret durre durte durtu dutte e-dee ebbed ebber ebbet eberg ebert ebure edder eddre edere edged edger edred eeeee eerde egede egged egger egret erbbe erber erdre erdut erede erege erere erred errtu erte erter ertug etete etree etter etude eturu eurre gbedu gberg gberu geber gebet gebre gebur gedeb geder gedge gedre gedur geere geert geete gegge gerbe gerd- gerde gerdt gerdu gerre gertt getee geter gette grebe grede greed greer greet grege gregg grete grett greut grgur grrrr grubb grube grude grued grure gruut gtube gubbe guber gubru guddu gudeg guder gudge gudur guede guere guged gurge gurre gurur gutte rebbe rebeg reber rebet rebud rebut redbd redde reder redub redug redur reede reege reere reger reget regge regtt regur regut rerde rere- reree reret reted retee reter retrg rette reuer reuet reute rubee ruber ruder rudge ruede ruegg ruere ruete ruger ruget rugge rurde ruter rutte ruutu tbtbt tbutt teber tebet teder tedge teege teerd tegre tegur teret tereu terge tergu terre tert- teter tetr- tette teuge treed treer treet treg- trere trete trett treut trubu trude trued truer trugg trute ttttt tubed tuber tuder tudre tudur turbe turbt turet turre turtu turut tutee tutte tuuru u-dub uber- udder udege udert udged ugrug urdee urged urger urgut urter urubu urutu uter- utrdb utter uttur utube uturu uuuuu