-er b-u bbb bbe bbg bbr bbt bbu be- beb bee beg ber bet beu bgb bge bgg bgr bgt bgu brb bre brg brr brt bru btb bte btg btr btt btu bub bue bug bur but buu ebb ebe ebg ebr ebt ebu eeb eee eeg eer eet egb ege egg egr egt egu erb ere erg err ert eru etb ete etg etr ett etu eu- eub eue eug eur eut gbe gbg gbr gbt gbu ge- geb gee geg ger get geu ggb ggg ggr ggt ggu grb gre grg grr grt gru gtb gte gtg gtr gtt gtu gu- gub gue gug gur gut guu rbb rbe rbg rbr rbt rbu re- reb ree reg rer ret reu rgb rge rgg rgr rgt rrb rrg rrr rrt rru rtb rte rtg rtr rtt rtu rub rue rug rur rut ruu tbb tbe tbg tbr tbt tbu te- teb tee teg ter tet teu tgb tge tgg tgr tgt tgu trb tre trg trr trt tru ttb tte ttg ttr ttt ttu tub tue tug tur tut tuu ubb ube ubg ubr ubt ubu ueb uee ueg uer uet ugb uge ugg ugr ugt ugu ur- urb ure urg urr urt uru utb ute utr utt utu uue uug uur uut uuu

bbbb bbeb bbet bbrg bebb bebe beeb beeg beer beet begg begu bere berg berr bert beru bete bett betu beur breb bree breg brer bret brrr brue brug brut btrt bttb bubb bube bubu buer bueu buge bugg bur- burb bure burg burr burt buru but- bute butt ebbr eber ebru ebur eeee eerg eete eetu egbe egbu egee eger eggb egge egre egte erbb erbe ereb erer eret erg- ergg erre ertu erub erur etbr etee eter etre ette ettu euer euge eur- eure eurt gebe geer geet gege gegg gerb gere gert geru getb gete getg gett geue ggbt gggg grbr greb gree greg gret greu grrr grub grue grug grur grut gtbr gubb gubu guer gugb guge gugg gugu gurb gure gurg gurr gurt guru gute gutt gutu rbbb rbbr rebb rebe rebu reeb reet rege regr regt regu rere rerg rert reru rete retr rett reue reut reuu rgbe rgtr rrrr rtee rubb rube rubu ruer ruet ruge rugg rure ruru rute rutt rutu tbrb tebu teer teet tegg tegt tegu ter- tere terr teru tete tetr tett tetu teut tre- tree treg tret treu trge trte trtr trub true trug trut truu ttbb tter tttt tubb tube tubr tubu tuer tuet tugg tugu turb ture turg turr turt turu tute tutt tutu ubbe uber ubet uggt ugur uguu urbe ure- uret urge urgu urre urte urur urut uter uttu utug uuuu

-tree bbbee be-er beber beebe beete beeut begee beget begge begue begur begut berbe bereg beret berge berre berru berte betee beter betre bett- bette beuer beure beute brebu breer breet breg- brege bregg brere brett breu- brrrr bruer bruet bruge brugg brute btr-t bubbe buber buger bugge bugre buret burge burgu burru burte burtt burut buter butte butut ebber ebbet eberg ebert ebure eeeee egger egret erbbe erber erege erere errtu erte erter ertug etete etree etter eturu eurre gberg gberu geber gebet gebre gebur geere geert geete gegge gerbe gerre gertt getee geter gette grebe greer greet grege gregg grete grett greut grgur grrrr grubb grube grure gruut gtube gubbe guber gubru guere gurge gurre gurur gutte rebbe rebeg reber rebet rebut reege reere reger reget regge regtt regur regut rere- reree reret retee reter retrg rette reuer reuet reute rubee ruber ruegg ruere ruete ruger ruget rugge ruter rutte ruutu tbtbt tbutt teber tebet teege tegre tegur teret tereu terge tergu terre tert- teter tetr- tette teuge treer treet treg- trere trete trett treut trubu truer trugg trute ttttt tuber turbe turbt turet turre turtu turut tutee tutte tuuru uber- ugrug urger urgut urter urubu urutu uter- utter uttur utube uturu uuuuu

b-tree bbbbbb beebee beebug beegee beeter begger berbee berber bereet berege berere berger berrer berret bertre berube betere betete betrue bettee better betutu beurre breege breere breger bregge brette breuer brubru brugge bruree bubber bububu bugbug bugger bugget burbet burbur burgee burger burree burrer burret burutu butere butter ebbert eburru eebree egbere egbert eggert erbree errett etgert ettutu eutere g-tube gbegbe gebbet gebert geegee gegger gerber gerege gereut gerger gerret gertte geruge getter greete greger gregge gregre greter grette grubbe gruber grugru gteter gubber gubeer gubgub gueber guebre guegue guerre guetre gurbru gurugu guttee gutter guttur r-tree rebute regret regueb reteer reteet retere retree retret retter rettur retube returu reuere reurge reuter reutte rubbee rubber rubutu rugetu rugger rurutu rutger ruttee rutter rutube t-tree t-tube teebee teetee teeter terete terrer terret terter tertre tetete tetter trebur treete treget tretee trette truett tubber tugger tugrug turbet turgut turret turtur tururu tuteur tutter tuttut u-tube ureter urette uteute

bbbbbbb bebeeru beergut beetree begreet berbere bergere bergger berrett bertree betberg bettger bregger breguet brugger brutter burbure burette egeberg eggbutt egrette gebette gee-gee gerbert greetee greeter gregbeu gregger gregree greuter grgeteg gru-gru grubber grutter guerbet gueret gurbrue gurue rebberg reeberg regreet regurge reteere reterre retrete rettert reuberg reutter tebbutt terere tergett terreer terrere tettete trebget treetee tregerg trettre truebut trugger tuggurt turbett tut-tut ub-tree utterer

bbbbbbbb bebetter bebutter bee-butt beerberg begetter berebere bergeret betterer breuberg bruterer bubertre buggerer buggerru bur-tree burgberg buruburu etbetter gerettet greegree re-beget rebutter teruteru trugberg tureberg

beebeebee butterbur eggburger eggerberg ettubrute getbetter regretter rutberget ruterberg tebe-tebe terbregge terguette tu-brugge

berberburr berbrugger bergerette berruguete betterbeer burgerbrug burgerregt butterbeer rubbertree treburgett

ettutubrute gettugbrute ueberreuter

bbbbbbbbbbbbbbb grrrrrrrrrrrrrr