-er b-u bbb bbe bbn bbr bbt bbu be- beb bee ben ber bet beu bnb bne bnn bnr bnt bnu brb bre brn brr brt bru btb bte btn btr btt btu bub bue bun bur but buu ebb ebe ebn ebr ebt ebu eeb eee een eer eet en- enb ene enn enr ent enu erb ere ern err ert eru etb ete etn etr ett etu eu- eub eue eun eur eut nbb nbe nbn nbr nbt nbu ne- neb nee nen ner net neu nnb nne nnn nnt nnu nrb nre nrn nrr nrt nru ntb nte ntn ntr ntt ntu nub nue nun nur nut nuu rbb rbe rbn rbr rbt rbu re- reb ree ren rer ret reu rnb rnn rnr rnt rnu rrb rrn rrr rrt rru rtb rte rtn rtr rtt rtu rub rue run rur rut ruu tbb tbe tbn tbr tbt tbu te- teb tee ten ter tet teu tnb tne tnn tnr tnt trb tre trn trr trt tru ttb tte ttn ttr ttt ttu tub tue tun tur tut tuu ubb ube ubn ubr ubt ubu ueb uee uen uer uet un- unb une unn unr unt unu ur- urb ure urn urr urt uru utb ute utn utr utt utu uue uun uur uut uuu

-ene bbbb bbeb bbet bebb bebe beeb been beer beet bene benn bent benu bere bern berr bert beru bete bett betu beur bner bnet bnrr breb bree bren brer bret brrr brue brun brut bten btrt bttb bubb bube bubu buen buer bueu bunb bune bunn bunt bunu bur- burb bure burn burr burt buru but- bute butt ebbr eben eber ebru ebur eeee eent eete eetu enb- enbn enbr enee ener enne ennu ent- ente entr enue enur enut erbb erbe ereb eren erer eret erne erre ertu erub erur etbr etee eten eter etne etnr etre ette ettn ettu etun euer eur- eure eurt nber nebb nebe nebn nebr nebu neeb neen neer neet nene nent nenu nere nerr nert neru net- netb nete nett neue neun neur neut neuu nnnn nntn nren nter nteu ntnu ntru nttr nube nuee nuer nune nunn nunt nure nurn nurr nurt nuru nute nutt nutu rbbb rbbr rebb rebe rebu reeb reen reet rene renn rent renu rere rert reru rete retr rett reue reut reuu rnbr rnnt rnut rrrr rrun rtee rubb rube rubu ruen ruer ruet rune runn runt rure ruru rute rutt rutu ruun tbrb tebu teen teer teet tenb tene tenn tent tenu ter- tere tern terr teru tete tetr tett tetu teut tneb tnut tre- tree tren tret treu trte trtr trub true trun trut truu ttbb tten tter tttt tubb tube tubr tubu tuen tuer tuet tunb tune tunn tunu turb ture turn turr turt turu tute tutt tutu ubbe uber ubet unbe uneb unee unen uner unne untb unte unut urbe ure- uret urne urre urte urun urur urut uter utne uttu uuen uuuu

-tree bbbee be-er beber beebe beene beete beeut bene- benet benne bennu benue benun benur benut berbe beren beret berne bernt berre berru berte berun betee beten beter betne betre bett- bette beuer beure beute brebu breen breer breet brene brenn brent brere brett breu- brrrr bruen bruer bruet brune brunn brunt brute bruun btr-t bubbe buben buber bunne bunte bunun bunut buren buret burn- burne burnt burru burte burtt burun burut buten buter butte butut e-ten ebber ebbet ebene ebern ebert ebner ebure eeeee eener eenet eeten enbun enent enete ennet enrut enten enter entre enure enurn erbbe erben erber ereen erere ernen ernet errtu erte erter ertun etern etete etnre etree etrun etten etter eturu eunet eurre neber nebet nebtu neere neetu nente neree neret nerre nerte nerur neten netne nette neuen neuer neueu neune neur- neure nnebe ntete nu-nu nunet nunun nure- nurun nutte rebbe reber rebet rebun rebut reene reere renee rener renet renne rente rere- reree reret rerun retee reter retnr rette reuen reuer reuet reune reute rtenn rubee ruben ruber ruere ruete rueun runer runet runne runte ruten ruter rutte ruutu t-nut tbtbt tbutt teber tebet tenen tener tenet teneu tenne tennu tente tenue tenur teret tereu terne terre tert- teten teter tetr- tette tntnt treen treer treet trene trent trere trete trett treut trubu truer trute ttnet ttttt tuber tuene tune- tuner tunne turbe turbt turen turet turn- turne turnt turnu turre turtu turut tutee tutte tutun tuuru ubeen uber- unbet unete unnet unnun unnur unnut unrun unten unter unurn urent urter urubu urutu utenn uter- utter uttur utube uturn uturu uunet uuuuu

b-tree bbbbbb beebee beerne beeter benben benete benett benner bennet bennur benreu bentee benter berbee berber bereet berene berere berner bernet berrer berret bertre berube betere betete betrue bettee betten better betune beturn betutu beuren beurre breere brener brenne brette breuer brubru bruern bruner brunet brunne bruree bubber bububu buerne bunnet bunter burbet burbur burn-e burner burnet burnut burree burren burrer burret burutu butene butere butner butnet butten butter ebbert eburru eebree enbene enteer entent enter- entere entete entre- entree entrer entune erbent erbree erenet ernee ernute errett eterne ettutu eutere nberet nebber nebeur neener nennur nerrer netter nettur neuent neuere neueue neuner neuter ntuntu nubber nuberu nuenen nunter nutter r-tree re-run rebent reburn rebute renner rennet renren rentee renter rerent reteer reteet retene retent retenu retere retree retret retter rettur retube retune return returu reuben reuere reuter reutte rubbee rubber rubent rubutu rueben ruente runner runnet rurutu ruttee rutten rutter rutube t-tree t-tube teebee teener teetee teeter tenbun tenent teneur tenner tennet tennur tenten tenter tenure tereen terene terete terner terren terrer terret terter tertre tetete tetter tntnet treben trebur treene treete trenet trenne trente tretee trette treuen treunt truett truten ttrent tubber tunner turben turbet tureen turnen turner turnet turret turtur tururu tuteur tutter tuttut u-tube u-turn ubuntu unbeen unbene unbent unburn unrent untent untree untrue untune unturn ureter urette urturn uteute

bbbbbbb bebeeru beerrun beetree benburb bennent bennett