b-tree bbbbbb bebeto beebee beeter berbee berbeo berber berceo bereet berere berrer berret bertre betere betete bettee better bettor bobber bobete bobote boccob boeber boerre boober booboo bootee booter borbor boreto borore bororo borte botere botero botete botoro botree botter breere brette brocco brocor brocot broter brotto ceecee cerco- cerete cerote certco cetore cobber cobbob cocco- cococo cocto- coerce coo-er coocoo cooter corbet corect corteo cortot cotote cotter crecco creete creote crobot crocco crocer croote ebbert ecobee ecobot ecotec ectro- eebree eerect eototo erbree eroto- errett etcetc etoeot ettore oberto obtect obtree ocreo- octett octree oerter oooooo otocec ottoor r-tree rebbec reboot rebore rebote recoct recore recreo recto- rector rerobe reroot retece reteer reteet reteoo retere retore retort retree retret retro- retrot retter robber robeco robert roboto rococo rocoto rooter rootte rorter rotter t-tree tecto- tector teebee teetee teeter tercer tercet terete terreo terrer terret terror terrot terter tertre tetete tetter tobeor toboot toccer toetoe tooter tootoo torcec torero tororo torret tortor totebo totoro totrot totter tr-rec trebce treboc trebor treece treete tretee trette trotec trotro trotte