ogbe ogdh ogee oger ogge oghs oght ogod ogog ogou ogre ogro ogus ohbe ohed ohee oher ohgr ohho ohhs ohob ohoh ohos ohre ohso ohss ohte ohto ohtu ohus oobe ooer ooes ooho oohs oooh oooo ooos oord oore oort oose oost ootb oots oous orbb orbe orbo orbs orbu orde ordo ords ordu ore- oreb ored oreg oreh oreo orer ores orge orgo orgs orhe orhs oro- oroe oror oros orot orro orrs orse orso orsu orte orth orto orts orub orus osbe osed osee oseh oser oses oset oshe osho oshs oshu osoo osor osos osrd osro ossb ossd osse osso ossu oste ostr osts otbd otbs oted otee oter otes othe otho othr oths oto- otoe otog otoh otoo otor otos otre otro otrs otse otsg otso otsu otte otto otts ottu otur otus oubs oude oudh ouds oued ouer ouge ough our- oure ouro ours ourt ousd ouse oust out- outb oute outh outo outs ouu- rbbb rbbr rbbs rbds rbgh rbhs rboh rbsd rbss rbst rder rdgs rdhs rdos rdso rebb rebe rebo rebs rebu redd rede redh redo redr reds redu reeb reed rees reet regd rege rego regr regs regt regu rehb rehe rehs reht reod reog reos reot reou rerd rere rerg rero rers rert reru rese resh reso ress rest retd rete reth reto retr rets rett reue reus reut reuu rgbe rgds rghs rgtr rgts rhbg rheb rhee rheo rhes rhet rhhs rhob rhod rhog rhoh rhos rhue rhug rhus rob- robb robe robo robs robt robu rodd rode rodo rods roed roeg roer roes roet roge rogg rogh rogo rohe rohr rohs rohu roob rood roog roor roos root rore roro rort roru rose rosh roso ross rost rote rotg roth roto rotr rots rott roub roud roue rouh rous rout rred rrhs rrrr rsdd rsdg rsds rsee rsgb rshd rshs rsos rsre rsts rstu rtdt rtee rtes rtgs rths rtss rtts rubb rube rubs rubu rudd rude rudo ruds rued ruer rues ruet ruge rugg rugh rugs ruhe ruhh ruhr ruhs rurd rure ruro rurs ruru ruse rush ruso russ rust rusu rute ruth ruto ruts rutt rutu ruud s-os sbbs sbds sber sbhs sbor sbot sbsd sbse sbst sbus sdds sder sdes sdet sdge sdgs sdhb sdhd sdhs sdog sdot sdrs sdss sdsu se-d se-e se-g se-h se-o se-s se-t se-u sebe sebo sebs sebt sede sedo seds seeb seed seeg seeh seer sees seet seeu sege segg segh sego segs segu sehe sehr sehs seod serb serd sere serg sero serr sers sert seru sese sesh seso sess sest set- sete seth seto sets sett seur sger sges sggg sggs sghs sgro sgsd sgsh sgss sgts shbs shbt she- sheb shed shee sheh sheo sher shes shet sheu shgr shhh shhs shod shoe shog shoo shor shos shot shou shre shrs shtg shts shub shud shue shug shur shus shut shuu sobe sobo sobr sobs sobt sobu sodd sode sodo sods sodu soeo soes sogh sogo sogs sohh soho sohs sohu sood soog soor soos soot sorb sord sore sorg sorh soro sorr sors sort soru sose sosh soso soss sost sote soth soto sots sotu soud soue sour sous sout srde sreb sreo sres srgb srhs sros srsd srtr srub ssbr ssdd ssee sses sset ssgs ssgt sshs ssot ssrg ssrs sssb sssh ssss sstb sstd ssth ssts stbd stbs stds sted stee steg steo ster stes stet stge stgr sthg sths stob stod stoe stog stoo stor stos stot stou strd stre stro strs stru stss sttd sttr stub stud stue stug stur stus stut sub- subb subd subg subh subo subs sudd sude sudh sudo suds sued suee suer sues suet sueu sug- suge sugg sugh sugo suhb suho suhr suoh suor suos sur- surd sure surg suro surr surs surt suru sus- susd suse suso suss sust susu sute suto sutu suus tbbs tbgs tbhs tbrb tbst tddb tdes tdhs tdor tdse tdss tebo tebu tedd tede teds teed teer tees teet tegg tegh tego tegs tegt tegu teho tehr teoh teor teos ter- tere tero terr ters teru tesd tese tesh teso tess test tete teth teto tetr tets tett tetu teut tghs tgts thbs thdr thds the- theb thed thee theo ther thes thet theu thoe thog thoo thor thos thot thou thre thro thru thsd thse thsr thss thtb thtr thts thud thue thug thur thus tobe tobo tobs tobt tobu todd tode todo tods todt todu toed toee toeh toer toes toet toge togh togo togr togs togt toho tohu tood tooh toor toos toot tord tore torg toro torr tors tort toru tosb tose tosh toso toss tost tosu totd tote toth toto totr tots tott toug touh tour tous tout tre- tred tree treg treo tres tret treu trge trhs trod troe trog troo tros trot trou trsd trst trte trtr trub trud true trug trus trut truu tsbd tsdb tses tset tsgt tshb tshe tshs tsob tsos tsou tsse tssg tssr tsst tsts ttbb tteo tter ttoe ttss tttt tubb tube tubo tubr tubs tubu tude tudu tuer tues tuet tugg tugh tugs tugu tuhs tuht tuhu tuor tuos turb turd ture turg turo turr turs turt turu tusd tush tuss tust tute tuto tuts tutt tutu tuuo ubbe ubbo uber ubet ubod ubos ubud udds uder udet udgb udge udoh udoo udos udot udsd udts uers uess ugeo uggo uggs uggt ughe ughs ugod ugos ugro ugur uguu uh-d uhde uher uhoh uhrs uhss uhuh uor- uore urbe urbs urde urds urdu ure- ured ureh ures uret urge urgh urgu urho uro- uroo urre urrh urse urso urss ursu urte urth urts urur urus urut usbe usbr usbs usde usdo usds usdt used usee user uses uset usgo usho ushr ushs ushu usoe usog usos ussb usse ussr usss usst ussu ustb uste usto usts usus uter utes uthe utor utto uttu utug uuuu

-tree b-e-d bbbee bbser bbuss bd-re bdoor bdort bdser