b-tree bbbbbb beebee beeter berbee berber bereet berere berrer berret bertre betere betete bettee better bewter breere brette brewer brewet c-webb ceecee cerete creete crewer crewet crwett ebbert eebree eerect erbree errett etcetc ewerer r-tree rebbec rebrew recrew retece reteer reteet retere retree retret retter rewere t-tree teebee teetee teeter tercer tercet terete terrer terret terter tertre tetete tetter tr-rec trebce treece treete treewe tretee trette trewce tweece webber weewee wertew wetere wetter wewere wrette