b-tree bbbbbb beebee beeker beerne beeter bekenu bekker benben benete benett benken benner bennet bennur benreu bentee benter berbee berber bereet bereke berene berere berken berker berkut berner bernet berrer berret bertre berube betere betete betrue bettee betten better betune beturn betutu beuren beurre breere brekke brener brenne brette breuer brubru bruern bruker bruket bruner brunet brunke brunne bruree bubber bububu buerne bukett bukkur bukuru bunker bunnet bunter burbet burbur burket burkut burn-e burner burnet burnuk burnut burree burren burrer burret buruku burutu butene butere butner butnet butten butter ebbert eburru eebree ekeren ektene enbene enkuru enteer entent enter- entere enterk entete entre- entree entrer entune erbent erbree erenet erketu erkner ernee ernute errett eterne ettutu eutere k-tree kebber keeker keenen keener kekkut kekune kenken kennen kenner kennet kenter kenure kenutu kerben kerber kereru kerken kerker kerkuk kernen kerner kertee ketene ketnet ketter ketuke keuruu krbune kreker krenek kretek kubeer kuenen kukere kuknur kunene kunert kuneru kunkur kunnen kunnur kunter kuntur kurkun kurree kurten kururu kutke kutner kutten kutter kuurne nberet nebber nebbuk nebeur neener nennur nerrer netrek netter nettur neuent neuere neueue neuner neuter ntuntu nubber nuberu nuenen nukkuu nukunu nunter nutter r-tree re-run rebent rebuke rebunk reburn rebute reeker rekken reknen rekrut renker renner rennet renren rentee renter rerent reteer reteet retene retent retenu retere retree retret retter rettur retube retune return returu reuben reubke reuere reuter reutte rubbee rubber rubent rubutu rueben ruente rukutu runner runnet rurkee rurutu ruttee rutten rutter rutube t-tree t-tube teebee teener teetee teeter tekken tekrur tenbun teneke tenent teneur tenker tenner tennet tennur tenten tenter tenure tereen terene terete terken terner terren terrer terret terter tertre tetete tetter tntnet trebek treben trebur treene treete treker trenet trenke trenne trente tretee trette tretuk treuen treunt truett truker truten ttrent tubber tuktuk tunker tunket tunner turben turbet tureen turken turker turnen turner turnet turret turtuk turtur tururu tuteur tutter tuttut u-neek u-tube u-turn ubuntu uenuku unbeen unbene unbent unburn unkeen unkent unkert unreke unrent untent untree untrue untune unturn ureter urette urturn uteute utukku utukur