b-tree bbbbbb beebee beefer beerne beeter befree befret benben benete benett benfer benner bennet bennur benreu bentee benter berbee berber bereet bereft berene berere berner bernet berrer berret bertre berube betere betete betrue bettee betten better betune beturn betutu beuren beurre breefe breere brener brenne brette breuer brubru bruern brufut bruner brunet brunne bruree bubber bububu buerne buffen buffer buffet bunnet bunter burbet burbur burfee burn-e burner burnet burnut burree burren burrer burret burutu butene butere butner butnet butten butter ebbert eburru eebree effere effete effutu efreet efter- enbene enfete enfree enteer entent enter- entere entete entre- entree entrer entune enturf erbent erbree erenet erfurt ernee ernute errett eterne ettutu eutere fenner ferber ferfer ferner fernet ferren ferrer ferret ferrur fertee ferter fetter feture feuter frefre frenne frente freren frette freure frunte fterer fterre fuente fuerte funner funrun furber furfen furfur furner furrer furrfu futret futter future nberet nebber nebeur neener nefere nefert nennur nerrer netter nettur neuent neuere neueue neuner neuter ntuntu nubber nuberu nuenen nunter nutter r-tree re-run rebent rebuff reburn rebute reefer reeffe refeet refeff refert refete refnet refret refter refurb refute renner rennet renren rentee renter rerent reteer reteet retene retent retenu retere retree retret retter rettur retube retune returf return returu reuben reuere reuter reutte rubbee rubber rubent rubutu rueben ruente rufete ruffer ruffet rufter runner runnet rurutu ruttee rutten rutter rutube t-tree t-tube teebee teener teetee teeter tefnut tenbun tenent teneur tenner tennet tennur tenten tenter tenure terbuf tereen terene terete terner terren terrer terret terter tertre tetete tetter teufen tntnet treben trebur treene treete trefet trefte trenet trenne trente tretee trette treuen treunt truett trufen trufte truten ttrent tubber tuffet tufter tunner turben turbet tureen turfen turfer turnen turner turnet turret turtur tururu tuteur tutter tuttut u-tube u-turn ubuntu ufreet unbeen unbene unbent unburn unfere unfete unfree unfret unreft unrent unrufe untent untree untrue untune unturf unturn ureter urette urturn uruffe uteute