b-tree bbbbbb beebee beerze beeter beezer behete behter berbee berber bereet berere berhet berrer berret berthe bertre betere betete bettee better betzet bezeth breere breeth breeze brethe brette bthree bzhete ebbert ebbeth eebree eez-eh erbree erreth errett ethere ethete etrez hebete heebee heehee heeter hehehe hehheh herber herbet herher herter herthe heter- hether hetter hetzer hezreh 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 terzet tetete tethee tether tetteh tetter thetee thethe threet threte thrett treete trehet tretee trette tzetze zeebee zehrer zerbet zertz zezere