b-tree bbbbbb bebeto beebee beeter berbee berbeo berber bereet berere berrer berret bertre betere betete bettee better bettor bobber bobete bobote boeber boerre boober booboo bootee booter borbor boreto borore bororo borte botere botero botete botoro botree breere brette broter brotto ebbert eebree eototo erbree eroto- errett etoeot ettore oberto obtree oerter oooooo ottoor r-tree reboot rebore rebote rerobe reroot reteer reteet reteoo retere retore retort retree retret retro- retrot retter robber robert roboto rooter rootte rorter rotter t-tree teebee teetee teeter terete terreo terrer terret terror terrot terter tertre tetete tetter tobeor toboot toetoe tooter tootoo torero tororo torret tortor totebo totoro totrot totter trebor treete tretee trette trotro trotte