b-tree bbbbbb beebee beeter behete behter berbee berber bereet berere berhet berrer berret berthe bertre betere betete bettee better breere breeth brethe brette bthree ebbert ebbeth eebree erbree erreth errett ethere ethete hebete heebee heehee heeter hehehe hehheh herber herbet herher herter herthe heter- hether hetter r-tree rehber rehete reteer reteet retere rether retree retret retter t-tree te-hee tebeth teebee teehee teerth teetee teeter teethe terete terrer terret terter tertre tetete tethee tether tetteh tetter thetee thethe threet threte thrett treete trehet tretee trette