-er b-u bbb bbe bbk bbn bbr bbt bbu be- beb bee bek ben ber bet beu bkb bke bkk bkn bkr bkt bnb bne bnk bnn bnr bnt bnu brb bre brk brn brr brt bru btb bte btk btn btr btt btu bub bue buk bun bur but buu ebb ebe ebk ebn ebr ebt ebu eeb eee eek een eer eet ekb eke ekr ekt eku en- enb ene enk enn enr ent enu erb ere erk ern err ert eru etb ete etk etn etr ett etu eu- eub eue eun eur eut k-t kbb kbe kbk kbn kbr kbu ke- keb kee kek ken ker ket kkb kke kkk kkn kkr kkt kku kn- kne knk knn knr knt knu krk krn krr krt kru ktb kte ktk ktn ktr ktt ktu kub kue kuk kun kur kut kuu nbb nbe nbk nbn nbr nbt nbu ne- neb nee nek nen ner net neu nke nkk nkn nkr nkt nku nnb nne nnk nnn nnt nnu nrb nre nrk nrn nrr nrt nru ntb nte ntk ntn ntr ntt ntu nub nue nuk nun nur nut nuu rbb rbe rbk rbn rbr rbt rbu re- reb ree rek ren rer ret reu rkb rke rkk rkt rku rnb rnn rnr rnt rnu rrb rrk rrn rrr rrt rru rtb rte rtk rtn rtr rtt rtu rub rue ruk run rur rut ruu tbb tbe tbk tbn tbr tbt tbu te- teb tee tek ten ter tet teu tkb tke tkk tkr tkt tnb tne tnk tnn tnr tnt trb tre trk trn trr trt tru ttb tte ttk ttn ttr ttt ttu tub tue tuk tun tur tut tuu ubb ube ubk ubn ubr ubt ubu ueb uee uen uer uet ukb uke ukk ukn ukr uku un- unb une unk unn unr unt unu ur- urb ure urk urn urr urt uru utb ute utk utn utr utt utu uue uun uur uut uuu

-ene bbbb bbeb bbet bebb bebe beeb beek been beer beet beke bene benk benn bent benu bere berk bern berr bert beru bete bett betu beuk beur bner bnet bnrr breb bree brek bren brer bret brkb brrr brue brun brut btek bten btrt bttb bubb bube bubu buen buer bueu buke bukk buku bunb bune bunk bunn bunt bunu bur- burb bure burk burn burr burt buru but- bute butt ebbr eben eber ebru ebur eeee eeke eent eete eetu ekeb ekek eken eker eket ekne ekur enb- enbn enbr enee ener enke enkr enne ennu ent- ente entr enue enur enut erbb erbe ereb eren erer eret erke erne erre ertu erub erur etbr etee eten eter etne etnr etre ette ettn ettu etun euer eur- eure eurt kbbb kbbe kbbk kbbr kbbt kbbu kbeb kbee kbek kben kber kbet kbkb kbkk kbkr kbnn kbnr kbnu kbrb kbre kbrk kbrn kbrt kbru kbtb kbte kbtk kbtn kbtr kbtt kbub kbue kbuk kbun kbur kbut kbuu kebb kebe kebn kebr kebt kebu keek keen keer keet kekb keke keku ken- kene kenk kenn kenr kent kenu ker- kerb kere kerk kern kerr kert keru ket- kete ketk ketr kett ketu keun keur kkbb kkbe kkbn kkbr kkbt kken kkkk kknb kkne kknn kknt kknu kkrb kkre kkrk kkrn kkrr kkrt kktk kktu kkut kkuu knbb knbe knbn knbr knbt knbu kneb knee knek knen knet kneu knkk knkt knnb knnk knnr knrb knrk knte kntk kntn kntr kntu knub knue knuk knur knut krbb krbe krbk krbr krbt kreb kree krek kren kret kreu krke krkk krkn krkr krku krnb krne krnk krnn krnt krnu krrb krre krrk krrn krrr krrt krtk krtn krtr krue kruk krun krur ktbb ktbn ktbr ktbt ktbu ktee ktek kten ktkb ktke ktkk ktkn ktkr ktkt ktku ktne ktnk ktnn ktnt ktrb ktre ktrk ktrn ktrr ktrt ktru kttk kttn kttr kttt kttu ktub ktun kubb kube kubr kubu kuek kuen kueu kuke kukk kukn kuku kune kunk kunr kunt kunu kurb kure kurk kurr kurt kuru kute kutr kutt kutu kuub kuuk kuur kuuu nber nebb nebe nebn nebr nebu neeb neen neer neet neke neku nene nent nenu nere nerk nerr nert neru net- netb nete nett neue neuk neun neur neut neuu nknt nktr nnnn nntn nren nter nteu ntnu ntru nttr nube nubk nuee nuer nuke nuku nune nunk nunn nunt nure nurn nurr nurt nuru nute nutt nutu nuuk rbbb rbbr rebb rebe rebk rebu reeb reek reen reet reke rekt rene renk renn rent renu rere rert reru rete retr rett reue reuk reut reuu rnbr rnnt rnut rrrr rrun rtee rtkn rubb rube rubu ruen ruer ruet ruke rukk rukn ruku rune runk runn runt rure ruru rute rutt rutu ruun tbrb tebu teek teen teer teet teke tenb tene tenk tenn tent tenu ter- tere terk tern terr teru tete tetr tett tetu teuk teut tneb tnut tre- tree trek tren tret treu trte trtr trub true truk trun trut truu ttbb tten tter tttt tubb tube tubr tubu tuen tuer tuet tuke tunb tune tunk tunn tunu turb ture turk turn turr turt turu tute tutt tutu ubbe ubek uber ubet ukek ukeu ukur unbe uneb unee unen uner unke unkn unne untb unte unut urbe ure- uret urke urne urre urte uruk urun urur urut uter utne uttu uuen uuuu

-tree b-r-k bbbee be-er bebek beber beebe beeke beene beete beeut beken beker bekke bene- benet benke benne bennu benue benuk benun benur benut berbe berek beren beret berk- berke berne bernt berre berru berte berun betee beten beter betke betne betre bett- bette beuer beure beute brebu breek breen breer breet breke brene brenk brenn brent brere brett breu- brrrr bruen bruer bruet bruke brune brunk brunn brunt brute bruun btr-t bubbe buben buber buker buket bukk- buknu bunke bunne bunte bunuk bunun bunut burek buren buret burke burn- burne burnt burru burte burtt buruk burun burut buten buter butke butte