b-tree bbbbbb beebee beegee beeter begger behete behter berbee berber bereet berege berere berger berhet berrer berret berthe bertre betere betete bettee better breege breere breeth breger bregge brethe brette bthree ebbert ebbeth eebree egbere egbert eggert erbree erreth errett etgert ethere ethete gbegbe gebbet gebert geegee gegger gerber gerege gerger gerret gerthe gertte gether getter gheber ghebre greete greger gregge gregre greter grethe grette gteter heberg hebete heebee heeger heehee heeter hehehe hehheh herber herbet herge herger herget herher herter herthe heter- hether hetter hhgttg r-tree regehr regret rehber rehete reteer reteet retere rether retree retret retter t-tree te-hee tebeth teebee teehee teerth teetee teeter teethe tegher terete terrer terret terter tertre tetete tethee tether tetteh tetter theegg thetee thethe thgttg threeg threet threte thrett treete treget trehet tretee trette