-er b-u bbb bbe bbf bbk bbr bbt bbu be- beb bee bef bek ber bet beu bfb bfe bff bfr bft bfu bkb bke bkf bkk bkr bkt brb bre brf brk brr brt bru btb bte btf btk btr btt btu bub bue buf buk bur but buu ebb ebe ebf ebk ebr ebt ebu eeb eee eef eek eer eet ef- efb efe eff efr eft ekb eke ekf ekr ekt eku erb ere erf erk err ert eru etb ete etf etk etr ett etu eu- eub eue euf eur eut fbb fbe fbf fbk fbr fbt fbu feb fee fef fek fer fet feu ffe fff ffk ffr fft ffu fkb fkf fkk fkt frb fre frf frk frr frt fru ftb fte ftf ftk ftr ftt ftu fub fue fuf fuk fur fut fuu k-t kbb kbe kbf kbk kbr kbu ke- keb kee kef kek ker ket kff kfu kkb kke kkk kkr kkt kku krf krk krr krt kru ktb kte ktf ktk ktr ktt ktu kub kue kuk kur kut kuu rbb rbe rbf rbk rbr rbt rbu re- reb ree ref rek rer ret reu rfb rfe rff rfk rfr rft rfu rkb rke rkf rkk rkt rku rrb rrf rrk rrr rrt rru rtb rte rtf rtk rtr rtt rtu rub rue ruf ruk rur rut ruu tbb tbe tbf tbk tbr tbt tbu te- teb tee tef tek ter tet teu tfb tfe tff tfk tfr tft tfu tkb tke tkk tkr tkt trb tre trf trk trr trt tru ttb tte ttf ttk ttr ttt ttu tub tue tuf tuk tur tut tuu ubb ube ubf ubk ubr ubt ubu ueb uee uef uer uet ufe uff ufr uft ufu ukb uke ukf ukk ukr uku ur- urb ure urf urk urr urt uru utb ute utf utk utr utt utu uue uur uut uuu

bbbb bbeb bbet bebb bebe beeb beef beek beer beet befe beff beft beke bere berk berr bert beru bete bett betu beuk beur bftt breb bree bref brek brer bret brfu brkb brrr brue brut btek btrt bttb bubb bube bubu buer bueu bufe buff bufr buke bukk buku bur- burb bure burk burr burt buru but- bute butt ebbr eber ebru ebur eeee eefe eeke eete eetu efbr efet efke eft- eftu ekeb ekek eker eket ekur erbb erbe ereb erer eret erft erke erre ertu erub erur etbr etee eter etfb etfe etre ette ettu euer eur- eure eurt f--k feeb feek feer feet fefe feff feke ferb fere ferk ferr fert feru fete fetr fett fetu ffee ffff ffrr fftf free fret frub frue fter ftub fubb fubu fuet fuff fufu fuke fukk fuku fur- fure furr furt fute futu kbbb kbbe kbbf kbbk kbbr kbbt kbbu kbeb kbee kbef kbek kber kbet kbfb kbff kbfk kbfr kbft kbkb kbkf kbkk kbkr kbrb kbre kbrf kbrk kbrt kbru kbtb kbte kbtf kbtk kbtr kbtt kbub kbue kbuf kbuk kbur kbut kbuu kebb kebe kebr kebt kebu keef keek keer keet kefb keff kefr keft kekb keke keku ker- kerb kere kerf kerk kerr kert keru ket- kete ketf ketk ketr kett ketu keur kfbk kfbt kfeb kfer kffb kfff kffk kfkb kfre kfrr kfru kfte kftk kftt kftu kfut kkbb kkbe kkbr kkbt kkfr kkft kkkk kkrb kkre kkrf kkrk kkrr kkrt kktk kktu kkut kkuu krbb krbe krbk krbr krbt kreb kree kref krek kret kreu krfe krff krft krke krkk krkr krku krrb krre krrf krrk krrr krrt krtk krtr krue kruf kruk krur ktbb ktbr ktbt ktbu ktee ktek ktfb ktkb ktke ktkk ktkr ktkt ktku ktrb ktre ktrf ktrk ktrr ktrt ktru kttf kttk kttr kttt kttu ktub ktuf kubb kube kubr kubu kuek kueu kuff kufr kuke kukk kuku kurb kure kurk kurr kurt kuru kute kutf kutr kutt kutu kuub kuuk kuur kuuu rbbb rbbr rebb rebe rebk rebu reeb reef reek reet refe reff refr reft refu reke rekt rere rert reru rete retr rett reue reuf reuk reut reuu rfef rkkf rrrr rtbf rtee rtfb rubb rube rubu ruer ruet rufe ruff ruft ruke rukk ruku rure ruru rute rutt rutu tbrb tebu teef teek teer teet teff teft teke ter- tere terf terk terr teru tete tetr tett tetu teuk teut tfeb tre- tree tref trek tret treu trfr trte trtr trub true truk trut truu ttbb tter ttff tttt tubb tube tubr tubu tuer tuet tufe tuff tuft tufu tuke turb ture turf turk turr turt turu tute tutt tutu ubbe ubek uber ubet ubtf ufer uffe ufuk ukek ukeu ukur urbe ure- uret urfe urff urft urke urre urte uruk urur urut uter uttu uutf uuuu

-tree b-r-k bbbee be-er bebek beber beebe beeft beeke beete beeut beffe befur beker bekke berbe berek beret berk- berke berre berru berte betee beter betke betre bett- bette beuer beure beute brebu breef breek breer breet breke brere brett breu- brrrr bruer bruet bruff bruke brute btr-t bubbe buber bufet buffe buker buket bukk- burek buret burke burru burte burtt buruk burut buter butke butte butut ebber ebbet ebert ebure eeeee ef-tu efere efetf effer effet efter efuru efutu ekker ekuku ekuru erbbe erber erere errtu erte erter eruke eteke etete etree etrek etter eturu eurre febre feere feret ferr- ferre ferte feter fette feuer feute freek freer freet freke frere frett freur frute ftrtt fu-fu futur k-t-b k-ute kebbe kebek keber keefe keere kefee kerek keret kerre kertu ketek keter kette kreef kreek kreke krete kreuk kruft kubek kuber kukur kurbu kurek kurku kurre kurte kuruk kutte kuttu kutur rebbe reber rebet rebut reefe reeft reere refer refet reffe refut rekke rere- reree reret retee reter rette reuer reuet reute rt-rk rubee ruber rubke ruere ruete ruffe rukke ruter rutte ruutu tbtbt tbutt teber tebet tebuk tefe teket tekke terek teret tereu terre tert- teter tetr- tette trbuk treer treet trefe treff trere trete trett treut trubu truer truff