b-tree bbbbbb bebite beebee 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 birute biteit bitier bitter bittie bittur biuret breere breite brette breuer bribe- bribee briber bribir bribri brubru bruree brutii brutti bubber bububu burbet burbur bureit burier buriti burree burrer burret burrie bururi burutu butere butter buttie buttir ebbert ebr-ii ebrie eburru eebree eerier eibert erbree erebti errett ettutu euerie eurite eutere i-bere i-bete i-bure i-tree irrite ittiri iturbe iturbi r-tree rebbit rebite rebuit rebute reiber reiter reteer reteet retere retire retree retret retter rettur retube returu reueir reuere reuire reuter reutte ribber ribbet ribbie ribbit ribibe ribier rieber rieter riette rietti rititi ritter riuere rubbee rubber rubbie rubier rubrie rubutu rui-be ruiter rurutu ruttee rutter rutube t-tree t-tube te-uri tebbit teebee teetee teeter teirei teitur terete teribe terrer terret terrie territ terter tertre tetete tetter tibbit tiber- tibere tiberi tibert tibeti tibiri tibrie tierer tieret tiete tietie tieute tirret tirrit titbit titibu titiri tittee titter tittie trebur treete tretee tretie trette tribit tribut triibe triter truett truite truitt tubber tubbie tuiuti turbet turbit turret turtur tururu tuteur tutter tuttut u-tube ureter urette urtite uteute utrubi