-er b-u bbb bbe bbi bbl bbr bbt bbu be- beb bee bei bel ber bet beu bi- bib bie bii bil bir bit biu blb ble bli bll blr blt blu brb bre bri brl brr brt bru btb bte bti btl btr btt btu bub bue bui bul bur but buu ebb ebe ebi ebl ebr ebt ebu eeb eee eel eer eet eib eie eii eil eir eit eiu elb ele eli ell elr elt elu erb ere eri erl err ert eru etb ete eti etl etr ett etu eu- eub eue eui eul eur eut ibb ibe ibi ibl ibr ibt ibu ie- iee iei iel ier iet iib iie iii iil iir iit iiu il- ilb ile ili ill ilr ilt ilu ir- irb ire iri irl irr irt iru itb ite iti itl itt itu iu- iub iue iui iur iut lbb lbe lbi lbl lbr lbt lbu leb lee lei lel ler let leu lib lie lii lil lir lit liu llb lle lli lll llr llt llu lrb lri lrr lrt lru ltb lte lti ltl ltr ltt ltu lub lue lui lul lur lut luu rbb rbe rbi rbl rbr rbt rbu re- reb ree rei rel rer ret reu rib rie rii ril rir rit rle rli rll rlr rlt rlu rrb rri rrl rrr rrt rru rtb rte rti rtl rtr rtt rtu rub rue rui rur rut ruu tbb tbe tbi tbl tbr tbt tbu te- teb tee tei tel ter tet teu tib tie tii til tir tit tiu tle tli tll tlr tlt tlu trb tre tri trl trr trt tru ttb tte tti ttl ttr ttt ttu tub tue tui tul tur tut tuu ubb ube ubi ubl ubr ubt ubu ueb uee uei uel uer uet uib uie uii uil uir uit uiu ulb ule uli ull ulr ult ulu ur- urb ure uri url urr urt uru utb ute uti utl utr utt utu uue uur uut uuu

bbbb bbeb bbet bblb bebb bebe bebi beeb beel beer beet beil beir beit bele beli bell belt belu bere beri berr bert beru bete beti bett betu beur bibb bibe bibi bibl bieb biel bier biet bieu bile bili bill bilt bilu birb bire biri birl birr birt biru bite bitt bitu blbt bleb blee blei blet bleu blir blit blub blue blur blut breb bree brei brel brer bret brie bril brit brrr brue brut btie btrt bttb bubb bube bubi bubu buel buer bueu buie buir buit buiu bulb bule buli bull bult bulu bur- burb bure buri burl burr burt buru but- bute buti butt ebbr ebel eber ebit ebli ebru ebul ebur eeee eele eete eetu eiei eier eile eire eitb eiti eitr el-b elbe elbi elbu elee eler elet elie elil elit elle elli ellu elte elue elui elul erbb erbe ereb erei erel erer eret erie eril erit eriu erle erli erll erre ertl ertu erub erur etbr etee etel eter etre ette etti ettu etui eubi euer eule eur- eure eurt i-be ibet ibie ible ibri ibtb ibtl ieet ieie iele iere ieri iett iiie iiii iiit iitr iitt ile- iler ilet ilie ilir ilit ill- ille illi illt ilre ilut irbe iree irel irer iri- irie iril irlb irre irri irte irti irul itbe itel iter itet itie itil itll itri itur iuel iuiu lblr lbrt le-u lebu leel leer leet leib leie leil leir leit lele leli lell lelu lere lert lete leti lett leur libe libr libu lieb liel lier liet lieu liii liir lilb lile lili lill lilt lilu lire liri lirl lirr lirt liru litb lite liti litl litr litt litu liue liut llet lleu llll lrrr ltbl ltee ltib lttr lube luer luit lule luli lull lulu lure luri lurt lute luti rbbb rbbr rble rebb rebe rebu reeb reel reet reii reil reir reit reiu relb rele rell relt rere reri rert reru rete reti retr rett reue reul reut reuu rib- ribe ribu riel rier riet rieu rile rill rilu rire riri rite riti ritl ritt ritu riue rlee rleu rrle rrrr rtee rtei rtle rtlt rubb rube rubi rubu ruel ruer ruet ruit rule rull rure ruri ruru rute ruti rutl rutt rutu tbil tbit tbrb tebu teel teer teet teie teil teir teiu tel- tele teli tell telt telu ter- tere teri terr teru tete teti tetr tett tetu teut tibi tibu tie- tiee tiei tiel tier tiet tiit tiiu tile till tilr tilt tirb tire tiri tirl tirr tiru tite titi titt titu tlli tre- tree trei tret treu tri- trib trie tril trit trte trtr trub true trut truu ttbb tter tttt ttul tubb tube tubr tubu tuei tuel tuer tuet tuil tuit tuiu tule tuli tull tulu turb ture turi turr turt turu tute tuti tutl tutt tutu u-ie ubbe ubbi uber ubet ubii ubir ubit uble ubli ueir uele ueli uell uile uirr uleb ulee ulie ulle ulli ullr ulti ultt ulul urbe urbi ure- uret urib urie uriu urle urre urri urte urur urut utel uter util utri utti uttu uulu uuri uuuu

-tree bbbee be-er bebel beber bebti beebe beele beeli beeri beete beeut beibi beier beire beite belee belet belie belit beliu bellb belle belli belue belur belut berbe berei berel beret berie beril berit beriu berle berli berre berri berru berte berti betee betel beter betie betle betre bett- bette betti betul beuer beuil beule beure beute bibbe bibel biber bibie bible bibri biebe biele biere bieri biert bieti bilbe bilbi bilel bili- bille billi billu bilut birel birie birle birur bitel biter bitit bitle bitru bitte bitti biure bleer bleet bleib bleit blere blete bleue blier blirt blite blitt bliue bluer bluet bluie blurb blure blurr blurt brebu breel breer breet breil breit brell brere brett breu- bribe briel brier brill brite britt brrrr bruer bruet bruit bruiu brule brull bruri brute btile btr-t bubbe buber buble