-er bbb bbe bbo bbr bbt be- beb bee beo ber bet bez bob boe boo bor bot boz brb bre bro brr brt brz btb bte bto btr btt btz bze bzo bzr bzz ebb ebe ebo ebr ebt eeb eee eeo eer eet eo- eob eoe eoo eor eot erb ere ero err ert erz etb ete eto etr ett etz eze ezo ezr ezz ob- obb obe obo obr obt oeb oee oeo oer oet oo- oob ooo oor oot or- orb ore oro orr ort orz ot- otb ote oto otr ott otz oze ozo ozt ozz rbb rbe rbo rbr rbt re- reb ree reo rer ret rez rob roe roo ror rot roz rrb rrr rrt rtb rte rto rtr rtt rtz rzb rze rzo tbb tbe tbo tbr tbt tbz te- teb tee teo ter tet tez to- tob toe too tor tot toz trb tre tro trr trt trz ttb tte tto ttr ttt tze zbb zbr zbt zeb zee zeo zer zet zez zo- zob zoe zoo zor zot zro zte ztr zzr zzt zzz

bbbb bbeb bbet bebb bebe bebo beeb beer beet beo- beor beot bere bero berr bert bete beto bett betz beze bobb bobe bobo boee boeo boer boet boob booe boor boot booz bor- bore boro borr bort borz botb bote boto bott bozo breb bree breo brer bret brez brob broe broo bror brot broz brrr btob btor btrt bttb bzer bzoe bzzt bzzz ebbo ebbr eber eboe eboo ebor ebro eeee eero eete eeze eore eoto erbb erbe ereb erer eret erez erob eroe eroo erre erro ertz etbr etee eter etoe etre etro ette etto ezer ezzo o-eo obbo ober obet oboe obor obot obre obro oere oetz oobe ooer oooo oore oort ootb ooze orbb orbe orbo ore- oreb oreo orer oro- oroe oror orot oroz orro orte orto orzo otee oter oto- otoe otoo otor otre otro otte otto ozee ozer ozet rbbb rbbr rebb rebe rebo reeb reet reot rere rero rert rete reto retr rett retz reze rob- robb robe robo robt roer roet roob roor root rooz rore roro rort rote roto rotr rott roze rozz rrrr rtee tbrb tebo teer teet teez teor teoz ter- tere tero terr tete teto tetr tett tetz tezz tobe tobo tobt toee toer toet toor toot tore toro torr tort tote toto totr tott toze tozo tre- tree treo tret trez troe troo trot trte trtr ttbb tteo tter ttoe tttt tzzt z-ro zber zebe zero zert zete zeto zeze zobo zoet zoo- zoot zorb zore zoro zort zote zott zotz zozo zrze zzzz

-tree bbbee be-er be-ro beber bebot beebe beete beez beote berbe beret berob beroe beror berre berte berto berze berzo betee beter betoo betor betre bett- bette betto bezer bo-bo bobet bobr bobre boero booer boore boort booze borbo boree borer boret boro- boroo borot borre borro bortz botet botez botro botte bozer bozoo breer breet breo- brere breto brett bretz breze brobo broer broto broze brrrr btr-t bzzzt ebber ebbet ebert eeeee eorre erbbe erber erere eretz eroor erore eroto error erte erter etete etoro etree etter ezbob o-r-b obbet obert obete obetz oboro obote obreb obrez obzor oo-er ooooo orbot oreo- orere orero orobe orobo oroer orret orter ortet ortoo ortze otere otero ototo otter ozero ozoro rebbe reber rebet reere reetz reeze rere- reree reret rerez rerob retee reter retro rette retto rezzo ro-ro robbe robbo rober robo- robor robot robrt robte roero rooer roore roote rorer roteb roter roto- rotor rotot rotte rotto rotz rotzo rozet tbtbt teber tebet teret teror terre terro tert- terzo teter tetr- tetro tette to-be tobbe tober tobet tobor tobot tobre toerr toeto toobe toore tooze torbe toreo toret torez torob torre torro torte torto toter toto- totoe totoo totte tozee tozer treer treet trere trete trett troee trooz trott ttttt tzere tzero z-ter zboze zebre zeebo zeero zerbe zerbo zeror zerre zerto zetor zober zorbo zorro zotob zotto zrbtt zzzzz

b-tree b-zero bbbbbb bebeto beebee beerze beeter beezer berbee berbeo berber bereet berere berrer berret bertre betere betete bettee better bettor betzet bobber bobete bobote boeber boerre boober booboo boortz bootee booter boozer borbor boreto borore bororo borte botere botero botete botoro botree botter breere breeze brette broter brotto brotze brzoze ebbert eebree eototo erbree eroto- errett etoeot etrez ettore oberto obtree oerter oooooo ottoor ozette ozzero r-tree reboot rebore rebote rebozo rerobe reroot reteer reteet reteoo retere retore retort retree retret retro- retrot retter robber robeez robert roboto rooter rootte roozer rorter rotter rozzer t-tree t-zero teebee teetee teeter terete terreo terrer terret terror terrot terter tertre terzet tetete tetter tobeor toboot toetoe tooter tootoo toozoo torero tororo torret tortor totebo totoro totrot totter tozero trebor treete tretee trette trooze trotro trotte tzetze zberoz zeebee zerbet zertz zezere zoozoo zorzor zotero

bbbbbbb beetree berbere berrett bertero bertree betbeze bo-tree bobotee boe-bot boo-boo borbore boretto borrero borreze bottero eeeroer erbezzo ezeroto oberrot obterre orebro oroboro orzotto ottetto ottrott re-bore reteere reterre retrete rettert rettore roberto robobee rootrot rotebro rozborz terere tereto- terreer terrere tettete to-bote toe-toe too-too torbert torrert tototoo trebez treetee trettre tro-tro trottee trotter zbereze zerbert zorbeez

bbbbbbbb bebetter beetroot berebere betterer betteror betterto bo-bo-bo boortree boottree boozeroo boretree bozzetto brebotte erezee etbetter retorter robertet robertot roboteer rootbeer teetoter terzetto toetotoe toottoot torotoro totterer treeroot trezerer trzeborz zerozero

beebeebee beet-root boor-tree boot-tree borborbor retrotort robotbeer rotrooter rozerotte tebe-tebe teterboro tortoreto zero-zero

beberebozo betterbeer rotorooter toe-to-toe

roto-rooter

teetertotter

teeter-totter tetter-totter

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