-er b-u bbb bbe bbn bbr bbt bbu be- beb bee ben ber bet beu bjj bjn bjr bjt bju bnb bne bnj bnn bnr bnt bnu brb bre brj brn brr brt bru btb bte btn btr btt btu bub bue buj bun bur but buu ebb ebe ebj ebn ebr ebt ebu eeb eee een eer eet ejt eju en- enb ene enn enr ent enu erb ere ern err ert eru etb ete etj etn etr ett etu eu- eub eue euj eun eur eut jbj jbr jbt jbu jeb jee jej jen jer jet jeu jjb jjj jjr jju jne jnj jnn jnr jnt jnu jrb jrn jrr jrt jtb jte jtn jtr jtt jtu jub jue jun jur jut nbb nbe nbn nbr nbt nbu ne- neb nee nej nen ner net neu nje njn nju nnb nne nnn nnt nnu nrb nre nrj nrn nrr nrt nru ntb nte ntn ntr ntt ntu nub nue nuj nun nur nut nuu rbb rbe rbn rbr rbt rbu re- reb ree ren rer ret reu rjr rnb rnn rnr rnt rnu rrb rrn rrr rrt rru rtb rte rtj rtn rtr rtt rtu rub rue run rur rut ruu tbb tbe tbj tbn tbr tbt tbu te- teb tee tej ten ter tet teu tje tjr tju tnb tne tnn tnr tnt trb tre trn trr trt tru ttb tte ttn ttr ttt ttu tub tue tuj 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 utj utn utr utt utu uue uun uur uut uuu

-ene bbbb bbeb bbet bebb bebe beeb beej been beer beet bene benj benn bent benu bere bern berr bert beru bete bett betu beur bner bnet bnrr breb bree bren brer bret brje brnj brrr brue brun brut bten btrt bttb bubb bube bubu buen buer bueu buje buju bunb bune bunn bunt bunu bur- burb bure burj burn burr burt buru but- bute butt ebbr eben eber ebru ebur eeee eent eete eetu ejer enb- enbn enbr enee ener enne ennu ent- ente entj 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 jebb jebe jeer jeet jeju jene jent jenu jere jert jeru jetb jete jetn jett jeur jner jnet jrbr jube jubu juju junb june junr junt junu jure jurn jurr jute nbbj 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 teej teen teer teet tejn teju tenb tene tenn tent tenu ter- tere terj 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 bejte bene- benet benju 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 bujne bujru bunje bunju 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 ejure 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 eujet eunet eurre jebet jeetu jejur jenne jerre jerte jetee jeter jette jetut jeune jeure ju-ju jubbe jubeb juben jubet jubur jueju junee junet junju junne junte junub junun juter juuru n-jet neber nebet nebtu neere neetu nente neree neret nerre nerte nerur neten netne nette neuen neuer neueu neune neur- neure njeru nnebe nteje ntete nu-nu nunet nunun nure- nurun nutte rebbe reber rebet rebun rebut reene reere renee rener renet renju renne rente rere- reree reret rerun retee reter retje retnr rette reuen reuer reuet reune reute rtejr rtenn rubee ruben ruber ruere ruete rueun runer runet runne runte ruten ruter rutte ruutu t-nut tbtbt tbutt teber tebet tejen tenen tener tenet teneu tenju tenne tennu tente tenue tenur teret tereu terje terne terre tert- teten teter tetr- tette tjebu tntnt treen treer treet trene trent trere trete trett treut trnje trubu truer trute ttnet ttttt tuber tuene tune- tuner tunje tunne turbe turbt turen turet turje turju turn- turne turnt turnu turre turtu turut tutee tutte tutun tuuru ubeen uber- ujue 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 bejjur 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 bjerre 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