-er b-u bbb bbe bbk bbl bbr bbt bbu be- beb bee bek bel ber bet beu bkb bke bkk bkl bkr bkt blb ble blk bll blr blt blu brb bre brk brl brr brt bru btb bte btk btl btr btt btu bub bue buk bul bur but buu ebb ebe ebk ebl ebr ebt ebu eeb eee eek eel eer eet ekb eke ekl ekr ekt eku elb ele elk ell elr elt elu erb ere erk erl err ert eru etb ete etk etl etr ett etu eu- eub eue eul eur eut k-t kbb kbe kbk kbl kbr kbu ke- keb kee kek kel ker ket kkb kke kkk kkl kkr kkt kku kl- klb klr klt klu krk krl krr krt kru ktb kte ktk ktl ktr ktt ktu kub kue kuk kul kur kut kuu lbb lbe lbk lbl lbr lbt lbu leb lee lek lel ler let leu lkb lkl lkr lkt llb lle llk lll llr llt llu lrb lrk lrr lrt lru ltb lte ltk ltl ltr ltt ltu lub lue luk lul lur lut luu rbb rbe rbk rbl rbr rbt rbu re- reb ree rek rel rer ret reu rkb rke rkk rkt rku rle rll rlr rlt rlu rrb rrk rrl rrr rrt rru rtb rte rtk rtl rtr rtt rtu rub rue ruk rur rut ruu tbb tbe tbk tbl tbr tbt tbu te- teb tee tek tel ter tet teu tkb tke tkk tkl tkr tkt tle tlk tll tlr tlt tlu trb tre trk trl trr trt tru ttb tte ttk ttl ttr ttt ttu tub tue tuk tul tur tut tuu ubb ube ubk ubl ubr ubt ubu ueb uee uel uer uet ukb uke ukk ukl ukr uku ulb ule ulk ull ulr ult ulu ur- urb ure urk url urr urt uru utb ute utk utl utr utt utu uue uur uut uuu

bbbb bbeb bbet bblb bebb bebe beeb beek beel beer beet beke bele belk bell belt belu bere berk berr bert beru bete bett betu beuk beur blbt bleb blee blek blet bleu blkb blub blue blur blut breb bree brek brel brer bret brkb brrr brue brut btek btrt bttb bubb bube bubu buel buer bueu buke bukk buku bulb bule bulk bull bult bulu bur- burb bure burk burl burr burt buru but- bute butt ebbr ebel eber ebru ebul ebur eeee eeke eele eete eetu ekeb ekek eker eket ekur el-b elbe elbu elee elek eler elet elke elle ellu elte elue elul erbb erbe ereb erel erer eret erke erle erll erre ertl ertu erub erur etbr etee etel eter etre ette ettu euer eule eur- eure eurt kbbb kbbe kbbk kbbl kbbr kbbt kbbu kbeb kbee kbek kbel kber kbet kbkb kbkk kbkl kbkr kblb kble kbll kblr kblt kblu kbrb kbre kbrk kbrl kbrt kbru kbtb kbte kbtk kbtl kbtr kbtt kbub kbue kbuk kbul kbur kbut kbuu kebb kebe kebr kebt kebu keek keel keer keet kekb keke kekl keku kele kelk kell kelt kelu ker- kerb kere kerk kerl kerr kert keru ket- kete ketk ketr kett ketu keul keur kkbb kkbe kkbl kkbr kkbt kkkk kklb kkll kkrb kkre kkrk kkrl kkrr kkrt kktk kktl kktu kkut kkuu klbb klbe klbl klbt klbu kleb klee klek kler klet klkk klkl klkr kllb klle kllk klrk klrr klru kltk kltr kltt klub klue kluk klur kluu krbb krbe krbk krbl krbr krbt kreb kree krek kret kreu krke krkk krkr krku krle krlt krrb krre krrk krrl krrr krrt krtk krtr krue kruk krul krur ktbb ktbl ktbr ktbt ktbu ktee ktek ktel ktkb ktke ktkk ktkr ktkt ktku ktlb ktlk ktlr ktlt ktlu ktrb ktre ktrk ktrl ktrr ktrt ktru kttk kttr kttt kttu ktub ktul kubb kube kubr kubu kuek kuel kueu kuke kukk kukl kuku kulb kule kull kult kulu kurb kure kurk kurl kurr kurt kuru kute kutr kutt kutu kuub kuuk kuul kuur kuuu lblr lbrt le-u lebu leek leel leer leet leke lekk lele lell lelu lere lerk lert lete lett leuk leur llet lleu llll lrrr ltbl ltee ltke lttr lube luer luke lule lull lulu lure lurk lurt lute luuk rbbb rbbr rble rebb rebe rebk rebu reeb reek reel reet reke rekt relb rele rell relt rere rert reru rete retr rett reue reuk reul reut reuu rlee rleu rrle rrrr rtee rtle rtlt rubb rube rubu ruel ruer ruet ruke rukk ruku rule rulk rull rure ruru rute rutl rutt rutu tbrb tebu teek teel teer teet teke tel- tele tell telt telu ter- tere terk terr teru tete tetr tett tetu teuk teut tre- tree trek tret treu trte trtr trub true truk trut truu ttbb tter tttt ttul tubb tube tubr tubu tuel tuer tuet tuke tule tulk tull tulu turb ture turk turr turt turu tute tutl tutt tutu ubbe ubek uber ubet uble uele uell ukek ukeu ukur uleb ulee ulek ulle ullr ultt uluk ulul urbe ure- uret urke urle urre urte uruk urur urut utel uter uttu uulu uuuu

-tree b-r-k bbbee be-er bebek bebel beber beebe beeke beele beete beeut beker bekke belee belek belet bellb belle belue belur belut berbe berek berel beret berk- berke berle berre berru berte betee betel beter betke betle betre bett- bette betul beuer beule beure beute bleek bleer bleet bleke blekk blere blete bleue bluer bluet bluke blurb blure blurr blurt brebu breek breel breer breet breke brell brere brett breu- brrrr bruer bruet bruke brule brull brute btr-t bubbe buber buble buell buker buket bukk- bulb- bulke bull- bulle bulul bulut burek burel buret burke burle burru burte burtt buruk burut buter butke butle butte butut ebber ebbet ebble ebell eberl ebert eblul ebull ebure eeeee eeler ekker ekuku ekuru eleet elele eleut ellek ellel eller ellet ellul eltek elulu eluru elute erbbe erber erere erkel errtu erte ertel erter eruke eteke etete etree etrek