-er b-u bbb bbe bbm bbr bbt bbu be- beb bee bem ber bet beu bmb bme bmm bmr bmt bmu brb bre brm brr brt bru btb bte btm btr btt btu bub bue bum bur but buu ebb ebe ebm ebr ebt ebu eeb eee eem eer eet em- emb eme emm emr emt emu erb ere erm err ert eru etb ete etm etr ett etu eu- eub eue eur eut m-r mbb mbe mbm mbr mbt mbu meb mee mem mer met meu mmb mme mmm mmr mmt mmu mrb mre mrm mrr mrt mru mtb mte mtm mtr mtt mtu mub mue mum mur mut muu rbb rbe rbm rbr rbt rbu re- reb ree rem rer ret reu rmb rme rmm rmr rmt rrb rrm rrr rrt rru rtb rte rtm rtr rtt rtu rub rue rum rur rut ruu tbb tbe tbm tbr tbt tbu te- teb tee tem ter tet teu tmb tme tmm tmr tmt tmu trb tre trm trr trt tru ttb tte ttm ttr ttt ttu tub tue tum tur tut tuu ubb ube ubr ubt ubu ueb uee uem uer uet um- umb ume umm umr umt umu ur- urb ure urm urr urt uru utb ute utm utr utt utu uue uum uur uut uuu

bbbb bbeb bbet bebb bebe beeb beem beer beet beme bemu bere berm berr bert beru bete bett betu beur breb bree brem brer bret brrm brrr brue brum brut btrt bttb bubb bube bubu buem buer bueu bum- bumb bur- burb bure burm burr burt buru but- bute butt ebbr eber ebru ebur eeee eete eetu embe embr emer emet emeu emme emmu emre emte erbb erbe ereb erem erer eret erme erre ertu erub erum erur etbr etee etem eter etre etrm ette ettu euer eur- eure eurt mebe meem meer meet meme memr memu mer- merb mere merm mert meru met- mete mett metu meum mmmm mrbb mrbm mreb mree mrtm mrtt mtre mtrr mttr mube muee muet mume mumm mumu mure murr murt muru mute mutt mutu muut rbbb rbbr rebb rebe rebu reeb reem reet reme rere rert reru rete retr rett reue reut reuu rmtu rrrr rrum rtee rubb rube rubu ruer ruet rumb rume rumm rumt rure ruru rute rutt rutu tbrb tebu teem teer teet teme temu ter- tere term terr teru tete tetr tett tetu teut tmbr tmtt tre- tree trem tret treu trmb trmu trte trtr trub true trut truu ttbb tter tttt tubb tube tubr tubu tuer tuet tumb tume tumu turb ture turm turr turt turu tute tutt tutu tuum ubbe uber ubet umb- umbe umer umet umut urbe ure- uret urre urte urum urur urut uter utmb uttu uuuu

-tree bbbee be-er beber beebe beete beeut bembe bemer bemet berbe beret berme berre berru berte berum betee beter betre bett- bette beuer beure beute brebu breem breer breet breme bremm brere brett breu- brmmm brrrr bruer bruet brume brumm brute btr-t bubbe buber bumbu bumme buret burru burte burtt burut buter butme butte butut ebber ebbet ebert ebure eeeee embee ember embue emeer emere emert emmer emmet emtee emure erbbe erber erem- erere errtu erte erter etete etree etter eturu eum-u eurre mbebe mbere mbret mbube mburu mebbe meemu meere meete membe memer merer meret merre merte merur meter metr- metre mette metur meuer meure meute mmmmm mreru mrmet mt-te mt-tm mt-tr mt-tt mtree mtume mumbe mumme mummu muret mureu murre murru murum murut muter mutet mutum rebbe reber rebet rebut reeme reere remee remer remet remue rere- reree reret rerum retee retem reter rette reuer reuet reume reute rmutt rubee ruber ruere ruete rumbe rumer rummu ruter rutte ruutu tbtbt tbutt teber tebet teeme teemu tembe tembu terem teret tereu terme terre tert- teter tetr- tette treer treet treme trere trete trett treut trubu truer trume trute ttttt tuber tumbe tumbu tumut turbe turbt turem turet turre turtu turut tutee tutte tuuru uber- ubume umbe- umber umbre umeer umeme ureme urter urubu urutu uter- utmer utrum utter uttur utube uturu uuuuu

b-tree bbbbbb beebee beebem beembe beemer beerme beeter bemeet bemete bemute berbee berber bereet berere bermet berrer berret bertem bertre berube beteem betere betete betrue bettee better betutu beumer beurre breere bremer brette breuer brubru bruree brutum bubber bububu bumbee bummer burbet burbur burree burrer burret burutu butere butter ebbert eburru eburum eebree embree embrue embute emeere emeter emeute emmert emmett emmure erbree eretum errett ettutu eutere m-tree mbembe meerut meeter meetme meetre member membre mememe memere merete mermer mermet merrem merret merter merure meteer metrer metrum metter mettet mettur meurte muerte muette mummer murmur murree murter mutere mutter muttur mutuum muumuu r-tree rebute remeet remete remeue reteer reteet retere reterm retree retret retter rettur retube returu reuere reuter reutte reutum rubbee rubber rubrum rubutu rumber rumbur rummer rurutu ruttee rutter rutube t-tree t-tube teebee teemer teerme teetee teeter tembre temere terete termer terrer terret terter tertre tetete tetter trebur treete tremet tretee trette truett trumbe tubber tumer tummer tumtum turbet turmer turmut turret turrum turtur tururu tuteur tutter tuttut tutume u-tube ureter urette uteute

bbbbbbb bebeeru beetree berbere berrett bertemu bertree betemme brember bremete bremmer brummer brutter bum-bee burbure burette burtrum butembe e-meter eemmeer embrute emebert meemure membrum memmert mereret merrett mertert metreme metrete metteur mtembur murmure muu-muu r-meter rembert remeber remueur reteere reterre retrete rettert reutter rum-tum tebbutt temburu temettu terere terreer terrere tettete treetee tremeur trettre truebut trummer tum-tum tumburu turbett tut-tut ub-tree umbrere umbrete umuerum utterer

bbbbbbbb bebetter bebutter bee-butt bemurmur berebere berumbur betterer bremette bruterer bubertre bumburet bur-tree buruburu embetter erembert etbetter mbumburu memurubu meremere murmurer murumuru mutterer rebutter remember remembre remurmur terebrum teruteru tremembe umberere umbrette

beebeebee butterbur emmermeer ettubrute tebe-tebe

berberburr betterbeer butterbeer buttermere mememememe mettembert mumme-tree rememberer rememberme rubbertree

ettutubrute ueberreuter

mmmmmmmmmmmm

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