-er -th bbb bbe bbh bbo bbr bbt be- beb bee beh beo ber bet bhb bhe bhh bho bhr bht bob boe boh boo bor bot brb bre brh bro brr brt btb bte bth bto btr btt ebb ebe ebh ebo ebr ebt eeb eee eeo eer eet ehb ehe ehh eho ehr eht eo- eob eoe eoh eoo eor eot erb ere erh ero err ert etb ete eth eto etr ett hbb hbe hbh hbo hbr hbt he- heb hee heh heo her het hhb hhe hhh hho hhr hht hob hoe hoh hoo hor hot hr- hrb hre hrh hro hrr hrt htb hte hth hto htr htt ob- obb obe obh obo obr obt oeb oee oeh oeo oer oet ohe ohh oho ohr oht oo- oob ooh ooo oor oot or- orb ore orh oro orr ort ot- otb ote oth oto otr ott rbb rbe rbh rbo rbr rbt re- reb ree reh reo rer ret rh- rhb rhe rhh rho rhr rht rob roe roh roo ror rot rrb rrh rrr rrt rtb rte rto rtr rtt tbb tbe tbh tbo tbr tbt te- teb tee teh teo ter tet th- thb the thh tho thr tht to- tob toe toh too tor tot trb tre trh tro trr trt ttb tte tth tto ttr ttt

bbbb bbeb bbet bebb bebe bebo beeb beer beet behr beo- beor beot bere bero berr bert bete beth beto bett bher bhet bhor bhot bhrt bobb bobe bobo boee boeo boer boet boho bohr boht boob booe booh boor boot bor- bore borh boro borr bort botb bote both boto bott breb bree breo brer bret brob broe broh broo bror brot brrr btob btor btrt bttb ebbo ebbr eber eboe eboo ebor ebro eeee eero eete eeth eheh eher ehre ehte eore eoto erbb erbe ereb erer eret erob eroe eroo erre erro erth etbr etee eter eth- ethe etho etoe etoh etre etro ette etto hebb hebe hebo hebr heeb heer heet hehe heho heor herb here hero herr hert hete heth heto hett hhhh hobe hobo hoer hohe hoho hooe hoor hoot hore horo horr hort hotb hote hoth hoto hotr hott hree hrob hrtb hrte htet htoh httr o-eo obbo ober obet oboe obor obot obre obrh obro oere ohbe ohee oher ohho ohob ohoh ohre ohte ohto oobe ooer ooho oooh oooo oore oort ootb orbb orbe orbo ore- oreb oreh oreo orer orhe oro- oroe oror orot orro orte orth orto otee oter othe otho othr oto- otoe otoh otoo otor otre otro otte otto rbbb rbbr rboh rebb rebe rebo reeb reet rehb rehe reht reot rere rero rert rete reth reto retr rett rheb rhee rheo rhet rhob rhoh rob- robb robe robo robt roer roet rohe rohr roob roor root rore roro rort rote roth roto rotr rott rrrr rtee tbrb tebo teer teet teho tehr teoh teor ter- tere tero terr tete teth teto tetr tett the- theb thee theo ther thet thoe thoo thor thot thre thro thtb thtr tobe tobo tobt toee toeh toer toet toho tooh toor toot tore toro torr tort tote toth toto totr tott tre- tree treo tret troe troo trot trte trtr ttbb tteo tter ttoe tttt

-tree bbbee be-er be-ro beber bebot beebe beete beeth beher behet behot beote beoth berbe bereh beret berhe berob beroe beror berre berte berth berto betee beter bethe betoo betor betre bett- bette betto bheer bhoot bhore bo-bo bo-ho bobet bobr bobre boero bohor bohot bohte booer boore boort booth borbo boree borer boret boro- boroo borot borre borro borth botet bothe botro botte breer breet breo- brere breth breto brett brobo broer broth broto brrrr btr-t ebber ebbet ebert eeeee ehret eorre erbbe erber erere eroor erore eroto error erte erter erthe etete ether etho- etoro etree etter h-e-b he-he he-ro hebbe hebe- heber heere heete hehte heore heroe herre herro herte herth herto heter hethe hette hetto hheth hhhhh ho-ho ho-oh hobet hoboe hobor hobro hohoe hohot hooer hoore hoort horeb horhe horre horro horth horto hothe hothr hotot hotte hotto hrere hthrt htree o-r-b obbet obert obete obhor oboro obote oboth obreb oerth oh-oh ohbot ohrob ohrot ohthe oo-er ooher ooooh ooooo oothe orbot oreo- orere orero orobe orobo oroer orret orter ortet orth- orthe ortho ortoo otere otero other othre ototo otter rebbe reber rebet reere reerh reeth reher rehet rehoe rere- reree reret rerob retee reter rethe retro rette retto rheo- rhett rhoeo ro-ro robbe robbo rober robo- robor robot robrt robte roero rohob rooer roore roote rorer roteb roter rothe rotho roto- rotor rotot rotte rotto tbtbt teber tebet teeth tehee teret teror terre terro tert- teter tethe tetr- tetro tette thebe theeb theer theo- theor ther- there thero thete theth thobe thore thoro thorr thort thoth thre- three threo thret throb throe throo throt to-be to-ho tobbe tobeh tober tobet tobor tobot tobre toerr toeto toher tohoe tohot toobe toore tooth torbe toreo toret torht torob torre torro torte torto toter tothe toto- totoe totoo totte treer treet trere trete trett troee troth trott ttttt

b-tree bbbbbb bebeto beebee beeter behete behoot behote behror behter berbee berbeo berber bereet berere berhet beroth berrer berret berthe bertre betere betete bethor bettee better bettor bo-hoo bobber bobete bobote boeber boerre bohero boober booboo booher boohoe boohoo bootee booter boothe borbor boreth boreto borore bororo borte botere botero botete bother bothr- botoro botree botter breere breeth brethe brette broter brothe brotto bthree btooth ebbert ebbeth eebree eototo erbree eroto- erreth errett ethere ethete etoeot ettore hebete heebee heehee heeter hehehe hehheh heorot heort- herber herbet herbor herebo herero hereto herher heroor herter herthe heter- hetero hether hetter hobber hobbet hobert hoebee hohhot hohoho hoohoo hooroo hooter hororo horror horter hortor hotbot hother hotoro hotter hottot htotoe oberth oberto obtree oerter oerthe ohohoh ohtobe ohtoto oohooh oooooo orrho- ortho- otherh ottoor r-tree reboot rebore rebote rehber rehete