rbbb rbbr rcbc rccb rccc rcet rcgc rcnr rcrg rctc rctg rebb rebe rebu recc rece recr rect recu reeb reen reet rege regn regr regt regu rene reng renn rent renu rere rerg rert reru rete retr rett reue reut reuu rgbe rgtr rnbr rnnt rnut rrrr rrun rtcc rtce rtcg rtee rubb rube rubu ruce ruct ruen ruer ruet ruge rugg runc rune rung runn runt rurc rure ruru rute rutt rutu ruun tbcb tbcc tbce tbrb tccc tccu tcnn tctc tebu tecr tect teec teen teer teet tegg tegt tegu tenb tenc tene teng tenn tent tenu ter- terc tere tern terr teru tete tetr tett tetu teut tgcc tgtc tnbc tncc tneb tnge tnut trcc tre- trec tree treg tren tret treu trge trng trtc trte trtr trub truc true trug trun trut truu ttbb ttcn tten tter tttt tubb tube tubr tubu tucc tuen tuer tuet tugg tugu tunb tunc tune tung tunn tunu turb turc ture turg turn turr turt turu tute tutt tutu ubbe uber ubet ucbc ucrc ucut ugcc ugcg uggt ugne ugur uguu unbe uncc unce uncg unct uneb unec unee unen uner ungu unne untb unte unut urbe ure- uret urge urgu urne urre urte urun urur urut utec uter utne uttu utug uuen uuuu

-tree bbbee bbgun be-er beber becue becut beebe beene beete beeut begee beget begge begue begun begur begut bence bene- benet benge bengu benne bennu benue benun benur benut berbe bercu berec bereg beren beret berge berne bernt berre berru berte berun betee beten beter betne betre bett- bette beuer beure beute brebu brece breen breer breet breg- brege bregg brene breng brenn brent brere brett breu- brrrr bruce bruen bruer bruet bruge brugg brune brung brunn brunt brute bruun btc-e btr-t bubbe buben buber bucet bucur bugen buger bugge bugre bugun bunce bunge bungu bunne bunte bunun bunut burcu buren buret burge burgu burn- burne burnt burru burte burtt buruc burun burut butec buten buter butte butut c-tec ccccc ccett ccnet cebec ceber cecun ceene ceere cegge cegne cence ceneu cent- centr cerbu cerc- cerce cerec ceren cerer ceret cerge cerne cerre certe ceten cette cetun cneru cnnnn cntrc crebe crece creen creer cregg cren- crete cretu creu- creue crnce crnec crner cruce cruet crune crunt crure cten- ctene ctree cttee cubbe cubeb cuber cubub cunge cunne cunt- cunut curce curer curet curre curug cutcu cutee cuter e-ten ebber ebbet ebene eberg ebern ebert ebner ebure eccen eeeee eence eener eenet eeten egene eggen egger eggng egner egret enbun encge encre encur enent enete engen enger ennet enrge enrut enten enter entre enugu enure enurn erbbe erben erber erceg erect ereen erege erere ergen ergun ernen ernet errtu erte erter ertug ertun eruct etern etete etnre etree etrun etten etter etung eturu eucen eucre eugen eunet eurre gberg gberu geben geber gebet gebre gebur geere geert geete gegge genbu gener genet genge genre gente gentu gerbe gerce geren gerre gertt getee geten geter gette grebe grece grecu green greer greet grege gregg grenc grene greng grenn grent grete grett greut grgen grgur grrrr grubb grube grune grunt grure gruut gtube gubbe guben guber gubru guce gucer guene guere guern gugen guner gunge gungu gunne gunnr gunte guren gurge gurne gurre gurun gurur guten gutte ncree ncube neber nebet nebtu necr- nect- neece neere neetu negeb neger negre negru negun negur nente neree neret nerre nerte nerur neten netne nette neuen neuer neueu neune neur- neure ngege ngeue ngugu ngure nguru nnebe ntete nu-nu nucet nuget nunce nunet nunge nunun nurce nure- nurun nutec nutte rebbe rebec rebeg reber rebet rebun rebut recce recen recet rect- recte recue recur recut reece reege reene reere regec regen reger reget regge regne regtt regur regut rence renee reneg rener renet renge rengg renne rente rere- reree reret rerun retee reter retnr retrg rette reuen reuer reuet reune reute rngtt rtenn rtgun rubee ruben ruber rucer ruegg ruere ruete rueun rugen ruger ruget rugge runcu runec runer runet runge rungu runne runte rurec ruten ruter rutte ruutu t-nut tbtbt tbutt teber tebet tecn- tecnu tectb teege tegen tegre teguc tegur tenbc tencc tence tenen tener tenet teneu tenge tengu tenne tennu tente tenue tenur terce teret tereu terge tergu terne terre tert- teten teter tetr- tette teuge teugn tntnt treen treer treet treg- trenc trene trent trere trete trett treut trubu truce truer trugg trung trute ttnet ttttt tuber tucet tuctu tuene tugce tugen tugun tune- tuner tunge tunne tunng turbe turbt turen turet turn- turne turnt turnu turre turtu turut tutee tutte tutun tuuru u-cee ubeen uber- ucgun ugene ugrug unbet uncut unete unger unget ungur unnet unnun unnur unnut unrug unrun unten unter unurn urent urger urgun urgut urter urubu uruce urucu urutu utenn uter- utter uttur utube uturn uturu uunet uuuuu

b-tree bbbbbb bebung becune becure beebee beebug beegee beenge beerne beeter begec beggen begger begnet benben benete benett bengbu benger bengre benner bennet bennur benreu bentee benter berbee berber bereet berege berene berere bergen berger bergne berner bernet berrer berret bertre berube betere betete betrue bettee betten better betune betung beturn betutu beuren beurre bgtbcc breege breere breger bregge brener brenne bretcu brette breuer brgnng brubru bruern brugge bruner brunet brunne bruree bubber bububu buerne bugbug bugger bugget bunbeg bungee bunger bunnet bunter burbet burbur burcer bureng burgee burgen burger burn-e burner burnet burnut burree burren burrer burret burutu butene butere butner butnet butten butter butucu c-cube cebren ceecee ceener cenere center centr- centre centru centur cerete cerner cernet cernuc ceruce cetene cnbc-e creete crnece crnuce cruent cruger cubber cubert cubren cubube cucube cucuge cucurb cugtun cuguen cunen cunger cunner cunter curber curete curren currer curret curter cutcut cuttee cutten cutter ebbert eburru ecgene ectene eebree eerect egbere egbert egence egerne eggern eggert eguren enbene enberg encent enceur encunt encurb engret engure enteer entent enter- entere entete entre- entree entrer entune erbent erbree ercege erenet ergene ernee ernute errett etcetc eterne etgert ettutu eugene