b-tree bbbbbb bbqrub bebite beebee beeter beiber beirut beqiri bequit 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 buique 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 qerret queere queite querie querre queter queuer quibib quiere quiete quique quirer quirie quirre quiter quitit quitri qutrit qutrub r-tree rebbit rebite rebuit rebute reiber reiter requit 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 riquet rititi ritter riuere rubbee rubber rubbie rubier rubite rubrie rubutu rui-be ruiter rurutu ruttee rutter rutube t-tree t-tube te-uri tebbit teebee teetee teeter teirei teitur terete teribe terque terrer terret terrie territ terter tertre tetete tetter tibbit tiber- tibere tiberi tibert tibeti tibiri tibrie tierer tieret tiete tietie tieute tiquet tirret tirrit titbit titibu titiri tittee titter tittie trebur treete tretee tretie trette tribiq tribit tribut triibe trique triqui triter truett truite truitt tubber tubbie tuiuti turbet turbit turque turret turtur tururu tuteur tutter tuttut u-tube ubique ureter urette urique urtite uteute utrubi