b-tree bbbbbb beebee beerne beeter benben benete benett benner bennet bentee benter berbee berber bereet berene berere berner bernet berrer berret bertre betere betete bettee betten better breere brener brenne brette cebren ceecee ceener cenere center centr- centre cerete cerner cernet cetene cnbc-e creete crnece ebbert ectene eebree eerect enbene encent enteer entent enter- entere entete entre- entree entrer erbent erbree erenet ernee errett etcetc eterne nberet nccert nebber nectec neener nerrer netter r-tree rebbec rebent recent renner rennet renren rentee renter rerent retece reteer reteet retene retent retere retree retret retter rrence t-tree teebee teener teetee teeter tenent tenner tennet tenrec tenten tenter tercer tercet tereen terene terete terner terren terrer terret terter tertre tetete tetter tntnet tr-rec trebce treben treece treene treete trenet trenne trente tretee trette ttrent