b-tree bbbbbb bebite beebee beeper beeter beiber beirut berbee berber bereet berere berrer berret berrie bertie bertre berube beruri betere betete betire betrue bettee better bettie betutu beurre bibber bibiri bibiru bieber bierut biribi biripe birpur birute biteit bitier bitter bittie bittur biuret breere breite brette breuer bribe- bribee briber bribir bribri brubru bruree brutii brutti bubber bububu buppie burbet burbur bureit burier buriti burpee burper burree burrer burret burrie burrup bururi burutu butere butter buttie buttir ebbert ebr-ii ebrie eburru eebree eerier eibert erbree erebti errett ettutu euerie euippe euripe euripi eurite eutere i-bere i-bete i-bure i-tree ipeter irrite irrupt ittiri iturbe iturbi iturup pberet pebete peepee peeper peerer peerie peeter peetre peetri peiere peiper pepper perere peretu perier perire perite perper perpet perree perret perrie perter pertie pertre peteet peteri peteru petiet petite petree petrer petri- petrie petter pettet petti- pettit pieper pierie pierre pierri pieter pietri piette piperi pipeup pipier pipipi pipiri pipper pippet pippip piree pirrie pirrip pitier pitpit pitter pittie pituri piupiu pppppp preeti preeue preier preire prepub preter pretre prette preue- preui- priere prieue prieur pruett pruitt prurit pterri pubber puerer puppet pupput purete puriri purpie purpit purpre purpur purree purrer put-up puteri putput putrer puttee putter puttie puttur puture r-tree rebbit rebite rebuit rebute reeper reiber reiter repete repier repipe repper reprie repuit repure repuru repute reteer reteet retere retire retree retret retrip retter rettur retube returu reueir reuere reuire reuter reutte ribber ribbet ribbie ribbit ribibe ribier ribupe rieber rieter riette rietti ripert ripier ripper rippet rippit rititi ritter riuere rub-up rubbee rubber rubbie rubier rubite rubrie rubutu rui-be ruiter rupert rupite rurutu ruttee rutter rutube t-tree t-tube te-uri tebbit teebee teepee teerpu teetee teeter teirei teitur teppei tepper terepi terete teribe terper terrer terret terrie territ terter tertre tetete tetter tibbit tiber- tibere tiberi tibert tibeti tibiri tibrie tie-up tierer tieret tiete tietie tieute tip-it tip-up tipbet tipiti tippee tipper tippet tippit tiptur tirret tirrit titbit titibu titipu titiri tittee titter tittie tittup trebur treete treppe tretee tretie trette tribit tribut triibe tripet trippe tripup triter tritip truett trueup truite truitt tubber tubbie tuipui tuiuti tuppee tupper turbet turbit turpie turret turtur tururu tuteur tutter tuttut u-tube up-put upreti upripe ureter urette urtite uruppu uteute utrubi