b-tree bbbbbb beebee beerne beeter beever benben benete benett benner bennet bentee benter berbee berber bereet berene berere berner bernet berrer berret bertre betere betete bettee betten better bevern breere brener brenne brette brever brevet ebbert eebree enbene enerve enteer entent enter- entere entete entre- entree entrer erbent erbree erenet ernee errett eterne evener everte nberet nebber neener neerve nerrer nerver nervve netter nevern nevren r-tree rebent reever renner rennet renren rentee renter rerent reteer reteet retene retent retere retree retret retter revene revent reverb revere revert revver t-tree teebee teener teetee teeter teevee tenent tenner tennet tenten tenter tereen terene terete terner terren terrer terret terter tertre tetete tetter tevere tntnet treben treene treete trenet trenne trente tretee trette treven trevet ttrent vebret veerer veneer venene venere venett vennen venner venter ventr- ventre vereen verene verner vernet verree verren verrer verret vertre verven verver vervet vetere vetren vetter vreven vvvvvv