-er b-u bbb bbe bbi bbk bbr bbt bbu be- beb bee bei bek ber bet beu bi- bib bie bii bik bir bit biu bkb bke bkk bkr bkt brb bre bri brk brr brt bru btb bte bti btk btr btt btu bub bue bui buk bur but buu ebb ebe ebi ebk ebr ebt ebu eeb eee eek eer eet eib eie eii eik eir eit eiu ekb eke eki ekr ekt eku erb ere eri erk err ert eru etb ete eti etk etr ett etu eu- eub eue eui eur eut ibb ibe ibi ibk ibr ibt ibu ie- iee iei iek ier iet iib iie iii iir iit iiu ikb ike iki ikk ikr ikt iku ir- irb ire iri irk irr irt iru itb ite iti itk itt itu iu- iub iue iui iur iut k-t kbb kbe kbi kbk kbr kbu ke- keb kee kei kek ker ket kib kie kii kik kir kit kiu kkb kke kki kkk kkr kkt kku kri krk krr krt kru ktb kte ktk ktr ktt ktu kub kue kui kuk kur kut kuu rbb rbe rbi rbk rbr rbt rbu re- reb ree rei rek rer ret reu rib rie rii rik rir rit rkb rke rkk rkt rku rrb rri rrk rrr rrt rru rtb rte rti rtk rtr rtt rtu rub rue rui ruk rur rut ruu tbb tbe tbi tbk tbr tbt tbu te- teb tee tei tek ter tet teu tib tie tii tik tir tit tiu tkb tke tkk tkr tkt trb tre tri trk trr trt tru ttb tte tti ttk ttr ttt ttu tub tue tui tuk tur tut tuu ubb ube ubi ubk ubr ubt ubu ueb uee uei uer uet uib uie uii uir uit uiu ukb uke uki ukk ukr uku ur- urb ure uri urk urr urt uru utb ute uti utk utr utt utu uue uur uut uuu

bbbb bbeb bbet bebb bebe bebi beeb beek beer beet beik beir beit beke beki bere beri berk berr bert beru bete beti bett betu beuk beur bibb bibe bibi bieb bier biet bieu bike biku birb bire biri birk birr birt biru bite bitt bitu breb bree brei brek brer bret brie brik brit brkb brrr brue brut btek btie btrt bttb bubb bube bubi bubu buer bueu buie buik buir buit buiu buke buki bukk buku bur- burb bure buri burk burr burt buru but- bute buti butt ebbr eber ebit ebru ebur eeee eeke eete eetu eiei eier eike eiki eire eitb eiti eitr ekeb ekek eker eket ekki ekur erbb erbe ereb erei erer eret erie erik erit eriu erke erki erre ertu erub erur etbr etee eter etik etre ette etti ettu etui eubi euer eur- eure eurt i-be ibet ibie ibri ibtb ieet ieie iere ieri iett iiie iiii iiit iitr iitt ikee iker ikki ikri ikue irbe iree irer iri- irie irki irre irri irte irti itbe itek iter itet itie itri itur iuiu kbbb kbbe kbbi kbbk kbbr kbbt kbbu kbeb kbee kbek kber kbet kbib kbie kbik kbit kbiu kbkb kbkk kbkr kbrb kbre kbri kbrk kbrt kbru kbtb kbte kbtk kbtr kbtt kbub kbue kbuk kbur kbut kbuu kebb kebe kebi kebr kebt kebu keek keer keet keib keii keik keir kekb keke keki keku ker- kerb kere keri kerk kerr kert keru ket- kete keti ketk ketr kett ketu keur kibb kibe kibi kibr kibt kibu kier kieu kiii kiik kiit kiiu kiki kikk kikr kikt kiku kirb kiri kirk kirr kirt kiru kite kiti kitr kitt kitu kiur kiuu kkbb kkbe kkbi kkbr kkbt kkik kkit kkkk kkrb kkre kkrk kkrr kkrt kktk kktu kkut kkuu krbb krbe krbi krbk krbr krbt kreb kree krei krek kret kreu krib krik krit krke krki krkk krkr krku krrb krre krri krrk krrr krrt krti krtk krtr krue krui kruk krur ktbb ktbr ktbt ktbu ktee ktek ktib ktie ktik ktkb ktke ktkk ktkr ktkt ktku ktrb ktre ktri ktrk ktrr ktrt ktru ktti kttk kttr kttt kttu ktub ktui kubb kube kubr kubu kuei kuek kueu kuie kuik kuke kuki kukk kuku kurb kure kuri kurk kurr kurt kuru kute kuti kutr kutt kutu kuub kuuk kuur kuuu rbbb rbbr rebb rebe rebk rebu reeb reek reet reii reik reir reit reiu reke reki rekt rere reri rert reru rete reti retr rett reue reuk reut reuu rib- ribe ribu riek rier riet rieu rike riki rikk riku rire riri rite riti ritt ritu riue rrrr rtee rtei rubb rube rubi rubu ruer ruet ruit ruke ruki rukk ruku rure ruri ruru rute ruti rutt rutu tbit tbrb tebu teek teer teet teie teir teiu teke ter- tere teri terk terr teru tete teti tetr tett tetu teuk teut tibi tibu tie- tiee tiei tier tiet tiit tiiu tike tiki tiku tirb tire tiri tirr tiru tite titi titt titu tre- tree trei trek tret treu tri- trib trie trik trit trte trtr trub true truk trut truu ttbb tter tttt tubb tube tubr tubu tuei tuer tuet tuik tuit tuiu tuke turb ture turi turk turr turt turu tute tuti tutt tutu u-ie ubbe ubbi ubek uber ubet ubii ubik ubir ubit ueir ueki uirr ukek ukeu ukur urbe urbi ure- uret urib urie urik uriu urke urre urri urte uruk urur urut uter utik utri utti uttu uuri uuuu

-tree b-r-k bbbee be-er bebek beber bebti beebe beeke beeri beete beeut beibi beier beire beite beker bekir bekke bekti berbe berei berek beret berie berit beriu berk- berke berre berri berru berte berti betee beter betie betke betre bett- bette betti beuer beure beute bibbe biber bibie bibri biebe bieke biere bieri biert bieti biker bikie birie birur bitek biter bitit bitki bitru bitte bitti biure bkite brebu breek breer breet breik breit breke brere brett breu- bribe brier brike brite britt brrrr bruer bruet bruik bruit bruiu bruke bruri brute btr-t