b-tree bbbbbb bebite beebee beefer beeter befree befret beiber beirut berbee berber bereet bereft berere berrer berret berrie bertie bertre berube beruri betere betete betire betrue bettee better bettie betutu beurre bibber bibiri bibiru bieber bierut biribi birute biteit bitier bitter bittie bittur biuret breefe breere breite brette breuer bribe- bribee briber bribir bribri briefe brubru brufut bruree brutii brutti bubber bububu buffer buffet buffit burbet burbur bureit burfee burier buriti burree burrer burret burrie bururi burutu butere butter buttie buttir ebbert ebr-ii ebrie eburru eebree eerier effeir effere effete effutu efreet efter- eibert eifert er-rif erbree erebti erfurt errett ettutu euerie eurite eutere febri- feerie feifer feirie ferber ferfer ferier ferrer ferret ferri- ferrie ferrur fertee ferter fetter feture feuter fibber fieber fiebre fiefie fierte fiftie firret fitbit fitter fittie fittit frebie frefre freire frette freure fruti- frutti fterer fterie fterre fuerte furber furfie furfur furrer furrfu furtei futret futter future i-beft i-bere i-bete i-bure i-free i-tree if-bet iffier ifreet iftrue irrite ittiri iturbe iturbi r-tree rebbit rebite rebuff rebuit rebute reefer reeffe refeet refeff refert refete refire refrei refret refter refurb refute reiber reiter reteer reteet retere retief retire retree retret retter rettur retube returf returu reueir reuere reuire reuter reutte ribber ribbet ribbie ribbit ribibe ribier rieber rieter riette rietti riffer rififi rifter rititi ritter riuere rubbee rubber rubbie rubier rubite rubrie rubutu rufete ruffer ruffet ruffie rufter rui-be ruiter rurutu ruttee rutter rutube t-tree t-tube te-uri tebbit teebee teetee teeter tefibi tefui teirei teitur terbuf terete teribe terrer terret terrie terrif territ terter tertre tetete tetter teufit tibbit tiber- tibere tiberi tibert tibeti tibiri tibrie tiefer tierer tieret tiete tietie tieute tiff-f tirret tirrit titbit titeuf titfer titibu titiri tittee titter tittie trebur treete trefet trefte treife tretee tretie trette tribit tribut trifet triibe triter truett trufte truiff truite truitt tubber tubbie tuffet tuffie tufter tuiuti turbet turbit turfer turret turtur tururu tuteur tutter tuttut u-tube ufreet ureter urette urtite uruffe uteute utrubi