-er bbb bbd bbe bbo bbr bbt bdb bdd bde bdo bdr bdt be- beb bed bee beo ber bet bob bod boe boo bor bot brb brd bre bro brr brt btb btd bte bto btr btt dbb dbd dbe dbo dbr dbt ddb ddd dde ddo ddr ddt de- deb ded dee deo der det dob dod doe doo dor dot drb drd dre dro drr drt dtb dtd dte dto dtr dtt ebb ebd ebe ebo ebr ebt ed- edb edd ede edo edr edt eeb eed eee eeo eer eet eo- eob eod eoe eoo eor eot erb erd ere ero err ert etb etd ete eto etr ett ob- obb obd obe obo obr obt odb odd ode odo odr odt oeb oed oee oeo oer oet oo- oob ood ooo oor oot or- orb ord ore oro orr ort ot- otb otd ote oto otr ott rbb rbd rbe rbo rbr rbt rdb rdd rde rdo rdr rdt re- reb red ree reo rer ret rob rod roe roo ror rot rrb rrd rrr rrt rtb rtd rte rto rtr rtt tbb tbd tbe tbo tbr tbt tdb tdd tde tdo tdr tdt te- teb ted tee teo ter tet to- tob tod toe too tor tot trb trd tre tro trr trt ttb ttd tte tto ttr ttt

bbbb bbdd bbdo bbeb bbet bd-r bebb bebe bebo bede bedo beeb beed beer beet beo- beod beor beot berd bere bero berr bert bete beto bett bobb bobe bobo bodb bode bodo boee boeo boer boet boob bood booe boor boot bor- bord bore boro borr bort botb botd bote boto bott brdo brdt breb bred bree breo brer bret brob brod broe broo bror brot brrr btdt btob btor btrt bttb d-bo dbtt dddd ddot ddre debe debt dedd dede dedo deeb deed deer deet deor der- derb dere dero derr dete deto detr dobb dobe dod- dodd dode dodo doer doob dood door doot dord dore doro dorr dort dotd dote doto dott dred dree dret drob drod drot dted dtor dtot ebbo ebbr ebed eber eboe eboo ebor ebro edde eddo ede- eder edod eede eeee eero eete eode eore eotd eoto erbb erbe erde ereb ered erer eret erob erod eroe eroo erre erro etbr etee eter etoe etre etro ette etto o-eo obbo obdt obed ober obet oboe obor obot obre obro obtd odbo oddd oded odeo oder odet odoo odor odot oedo oere oobe ooer oooo oord oore oort ootb orbb orbe orbo orde ordo ore- oreb ored oreo orer oro- oroe oror orot orro orte orto otbd oted otee oter oto- otoe otoo otor otre otro otte otto rbbb rbbr rder rebb rebe rebo redd rede redo redr reeb reed reet reod reot rerd rere rero rert retd rete reto retr rett rob- robb robe robo robt rodd rode rodo roed roer roet roob rood roor root rore roro rort rote roto rotr rott rred rrrr rtdt rtee tbrb tddb tdor tebo tedd tede teed teer teet teor ter- tere tero terr tete teto tetr tett tobe tobo tobt todd tode todo todt toed toee toer toet tood toor toot tord tore toro torr tort totd tote toto totr tott tre- tred tree treo tret trod troe troo trot trte trtr ttbb tteo tter ttoe tttt

-tree b-e-d bbbee bd-re bdoor bdort be-er be-ro bebdo bebed beber bebod bebot bedde bedee beder bedet bedot beebe beede beerd beete beode beord beote berbe berde bered beret berob beroe beror berre berte berto betee beter betoo betor betre bett- bette betto bo-bo bobet bobr bobre bodd- boded boder bodoe bodor boedo boero boode booed booer boord boore boort borbo borde bordo bored boree borer boret boro- borod boroo borot borre borro botet botro botte bredd brede bredt breed breer breet breo- brerd brere breto brett brobo brodd brode brodo broer brood broto brrrr btr-d btr-t d-dot d-rod ddddd ddebo debed deber debet debot debro debte dedde dedee deder deede deere deore deoro derbe derde dered dero- derob derre derro deter detoo detre dette do-do dobee dober dobre dobro dodoo dodro doerr doodo doore doote dordt dored doree doret dorot dorre dorte doted doter dotoo dotto drbob drdre dredd drede dreed drere drobe drobo drode drood drote drott e-dee e-otd ebbed ebber ebbet ebert edder eddoe eddre edeo- edere edoor edott edred eeeee eerde eorre erbbe erber erdor erdre erede erere erode erodr eroor erore eroto erred error erte erter etete etoro etree etter o-r-b obbet obedt obert obete obodo oboro obote obreb odder odebo odeto odore oo-er ooooo orbed orbot order ordet ordre ordro oredo oreed oreo- orere orero orobe orobo orodo oroer orret orter ortet ortoo otere otero ototo otter rebbe reber rebet redbd redde reder redor redot reede reere reord rerde rere- reree reret rerob reted retee reter retro rette retto ro-ro robbe robbo robed rober robo- robor robot robrt robte rodbo rodde roded rodeo roder rodor roero roode rooer roore roote rorer roteb roted roter roto- rotor rotot rotte rotto tbtbt teber tebet teder teerd teodo teret teror terre terro tert- teter tetr- tetro tette to-be to-do tobbe tobed tober tobet tobor tobot tobre toder todor toerr toeto toobe toode tooed toord toore torbe torde tored toreo toret torob torre torro torte torto toted toter toto- totoe totoo totte treed treer treet trere trete trett trode troee trood trott ttttt

b-tree bbbbbb be-ode bebeto bedded bedder beddoe bedebt bedote beebee beedee beerde beeter berbee berbeo berber berede bereet berere berrer berret bertre betere betete betted bettee better bettor bobbed bobber bobete bobote bodder bodett boeber boerre boobed boober booboo booder boorde booted bootee booter borbor border bordre boreto borore bororo borte botere botero botete botoro botree botted botter bredbo bredde breded breder breede breere brette broder broode broter brotto dbette de-err debdeb debere debert debete debord debret debted debtee debtor dededo deeded deedee deeder deedto deodeo deorro derere derobe derrer dertod deterr detete detort detter dobbed