-er b-u bbb bbd bbe bbr bbt bbu bdb bdd bde bdr bdt bdu be- beb bed bee ber bet beu brb brd bre brr brt bru btb btd bte btr btt btu bub bud bue bur but buu dbb dbd dbe dbr dbt dbu ddb ddd dde ddr ddt ddu de- deb ded dee der det deu drb drd dre drr drt dru dtb dtd dte dtr dtt dtu dub dud due dur dut ebb ebd ebe ebr ebt ebu ed- edb edd ede edr edt edu eeb eed eee eer eet erb erd ere err ert eru etb etd ete etr ett etu eu- eub eud eue eur eut rbb rbd rbe rbr rbt rbu rdb rdd rde rdr rdt rdu re- reb red ree rer ret reu rrb rrd rrr rrt rru rtb rtd rte rtr rtt rtu rub rud rue rur rut ruu tbb tbd tbe tbr tbt tbu tdb tdd tde tdr tdt tdu te- teb ted tee ter tet teu trb trd tre trr trt tru ttb ttd tte ttr ttt ttu tub tud tue tur tut tuu ubb ube ubr ubt ubu udb udd ude udr udt udu ueb ued uee uer uet ur- urb urd ure urr urt uru utb utd ute utr utt utu uue uur uut uuu

bbbb bbdd bbeb bbet bd-r bebb bebe bede bedu beeb beed beer beet berd bere berr bert beru bete bett betu beur brdt breb bred bree brer bret brrr brud brue brut btdt btrt bttb bubb bube bubu budb budd bude budu buer bueu bur- burb burd bure burr burt buru but- bute butt dbtt dddd ddre ddub debe debt debu dedd dede dedu deeb deed deer deet der- derb dere derr dete detr deue deur deut dred dree dret drub drue drut druu dted dub- dubb dube dubu dudd dude dudu duer duet dure durt duru dute duur duut ebbr ebed eber ebru ebur edde ede- eder edru edur eede eedu eeee eete eetu erbb erbe erde ereb ered erer eret erre ertu erub erur etbr etee eter etre ette ettu eude euer eur- eure eurt rbbb rbbr rder rebb rebe rebu redd rede redr redu reeb reed reet rerd rere rert reru retd rete retr rett reue reut reuu rred rrrr rtdt rtee rubb rube rubu rudd rude rued ruer ruet rurd rure ruru rute rutt rutu ruud tbrb tddb tebu tedd tede teed teer teet ter- tere terr teru tete tetr tett tetu teut tre- tred tree tret treu trte trtr trub trud true trut truu ttbb tter tttt tubb tube tubr tubu tude tudu tuer tuet turb turd ture turr turt turu tute tutt tutu ubbe uber ubet ubud uder udet urbe urde urdu ure- ured uret urre urte urur urut uter uttu uuuu

-tree b-e-d bbbee bd-re be-er bebed beber bedde bedee beder bedet bedub bedue beebe beede beerd beete beeut berbe berde berdu bered beret berre berru berte betee beter betre bett- bette beuer beure beute brebu bredd brede bredt breed breer breet brerd brere brett breu- brrrr brud- brude brued bruer bruet brute btr-d btr-t bubbe buber budde buddu budur burde buret burru burte burtt burud burut buter butte butut ddddd debed deber debet debte debut dedde dedee deder dedur dedut deede deere derbe derde dered derre derub derue deter detre dette detur deure deut- drdre dredd drede dreed drere drude dubee duded duder duere duerr duete duett durbe dured duree durer duret durre durte durtu dutte e-dee ebbed ebber ebbet ebert ebure edder eddre edere edred eeeee eerde erbbe erber erdre erdut erede erere erred errtu erte erter etete etree etter etude eturu eurre rebbe reber rebet rebud rebut redbd redde reder redub redur reede reere rerde rere- reree reret reted retee reter rette reuer reuet reute rubee ruber ruder ruede ruere ruete rurde ruter rutte ruutu tbtbt tbutt teber tebet teder teerd teret tereu terre tert- teter tetr- tette treed treer treet trere trete trett treut trubu trude trued truer trute ttttt tubed tuber tuder tudre tudur turbe turbt turet turre turtu turut tutee tutte tuuru u-dub uber- udder udert urdee urter urubu urutu uter- utrdb utter uttur utube uturu uuuuu

b-tree bbbbbb bedded bedder bedebt beduru beebee beedee beerde beeter berbee berber berede bereet berere berrer berret bertre berube betere betete betrue betted bettee better betutu beurre bredde breded breder breede breere brette breuer brubru bruder brurde bruree bruted bubber bububu budded budder burbet burbur burder burdet burdur burred burree burrer burret burutu butere butted butter dbette de-err debdeb debere debert debete debret debted debtee deburr dedute deeded deedee deeder derere derrer derure deterr detete detter deturb deubre deuter dreder druber dubbed dubber dubdub dudder duerer dueted duetee duette duttee ebbert eburru eebree erbree errett ettutu eutere r-tree rebred rebute redbed redbud redded redder reddur redere redred redted redure reeded reeder reteed reteer reteet retere retree retret retted retter rettur retube returu reuere reuter reutte rubbed rubbee rubber rubutu rudder rudrur rurutu rutted ruttee rutter rutube t-tree t-tube tebedu tedded tedder tedure teebee teeder teetee teeter terete terrer terret terter tertre tetede tetete tetter trebur treder treete tretee trette truett tubbed tubber tudder turbet turret turtur tururu tuteur tutted tutter tuttut u-tube ubered udburu urdeur ureter urette uteute

bbbbbbb bebeeru beddred bedered beduer beetred beetree berbere bereted berrett bertree breeded breeder brerded brutter burbure burdett burette debrete debrett debuted deedeed derrett deterre detrude deubert deuter- drebber drubbed drubber dudette duetted duetter duterte eddered etudede rebreed red-bud redbeet reddeer reddere reddure redtube reedbed reteere reterre retrete retrude rettert retubed reutter tebbutt terere tereted terreer terrere tettete treetee trettre truebut turbett tut-tut ub-tree ubberud uddered uttered utterer

bbbbbbbb bebetter bebutter bederede bee-butt beedered berebere bertrude betbeder bettered betterer bruterer bubertre bur-tree burdette buruburu buttered deburred deterred deterrer detruded deturbed duddered dutertre etbetter rebutted rebutter red-deer redberet reddeber redubbed redubber reed-bed reedreed retruded rubbered rubetude ruddered teddered teetered teruteru tettered treduder truebred turreted

beebeebee butterbur ddddddddd ettubrute tebe-tebe true-bred tubedebut

berberburr betterbeer betterbred butterbeer debbeebbed etudebrute