-er b-u bbb bbe bbl bbr bbt bbu be- beb bee bel ber bet beu bez blb ble bll blr blt blu blz brb bre brl brr brt bru brz btb bte btl btr btt btu btz bub bue bul bur but buu buz bze bzr bzu bzz ebb ebe ebl ebr ebt ebu eeb eee eel eer eet elb ele ell elr elt elu elz erb ere erl err ert eru erz etb ete etl etr ett etu etz eu- eub eue eul eur eut eze ezr ezz lbb lbe lbl lbr lbt lbu leb lee lel ler let leu lez llb lle lll llr llt llu llz lrb lrr lrt lru lrz ltb lte ltl ltr ltt ltu ltz lub lue lul lur lut luu luz lzr lzu rbb rbe rbl rbr rbt rbu re- reb ree rel rer ret reu rez rle rll rlr rlt rlu rrb rrl rrr rrt rru rtb rte rtl rtr rtt rtu rtz rub rue rur rut ruu ruz rzb rze tbb tbe tbl tbr tbt tbu tbz te- teb tee tel ter tet teu tez tle tll tlr tlt tlu tlz trb tre trl trr trt tru trz ttb tte ttl ttr ttt ttu tub tue tul tur tut tuu tuz tze tzu ubb ube ubl ubr ubt ubu ueb uee uel uer uet ulb ule ull ulr ult ulu ur- urb ure url urr urt uru urz utb ute utl utr utt utu utz uue uur uut uuu uzb uzu zbb zbl zbr zbt zeb zee zel zer zet zez zlr zlt zrl zte ztl ztr zub zul zur zut zuz zzr zzt zzz

bbbb bbeb bbet bblb bebb bebe beeb beel beer beet bele bell belt belu belz bere berr bert beru bete bett betu betz beur beze bezu blbt bleb blee blet bleu blub blue blur blut breb bree brel brer bret brez brrr brue brut bruz btrt bttb bubb bube bubu buel buer bueu bulb bule bull bult bulu bulz bur- burb bure burl burr burt buru burz but- bute butt butz buuz buze buzz bzer bzzt bzzz ebbr ebel eber ebru ebul ebur eeee eele eete eetu eeze el-b elbe elbu elee eler elet elle ellu elte eltz elue elul elze erbb erbe ereb erel erer eret erez erle erll erre ertl ertu ertz erub erur etbr etee etel eter etre ette ettu etuz euer eule eur- eure eurt ezel ezer ezuz lblr lbrt le-u lebu leel leer leet lele lell lelu lere lert lete lett leur leze llet lleu llll lrrr ltbl ltee lttr lube luer lule lull lulu lulz lure lurt lurz lute lutz luze lztt rbbb rbbr rble rebb rebe rebu reeb reel reet relb rele rell relt rere rert reru rete retr rett retz reue reul reut reuu reze rezu rlee rleu rrle rrrr rtee rtle rtlt rubb rube rubu ruel ruer ruet ruez rule rull rure ruru rute rutl rutt rutu ruze tbrb tebu teel teer teet teez tel- tele tell telt telu telz ter- tere terr teru tete tetr tett tetu tetz teut tezu tezz tre- tree tret treu trez trte trtr trub true trut truu ttbb tter tttt ttul tubb tube tubr tubu tuel tuer tuet tule tull tulu turb ture turr turt turu tute tutl tutt tutu tuzu tuzz tzur tzut tzzt ubbe uber ubet uble uele uell uetz uleb ulee ulez ulle ullr ultt ultz ulul urbe ure- uret urle urre urte urur urut uruz utel uter uttu uulu uuuu uzbl uzeb uzel uzer zber zebe zebu zeel zele zell zert zete zeze zrze zubr zubu zule zull zulu zulz zurb zurr zuru zuul zuzu zzzz

-tree bbbee be-er bebel beber beebe beele beete beeut beez belee belet bellb belle belue belur belut berbe berel beret berle berre berru berte berze betee betel beter betle betre bett- bette betul beuer beule beure beute bezel bezer bezle bleer bleet bleez blere blete bleue bluer bluet bluez blurb blure blurr blurt brebu breel breer breet brell brere brett bretz breu- breze brrrr bruer bruet brule brull brute bruzz btr-t bubbe buber buble buell bulb- bull- bulle bulul bulut burel buret burle burru burte burtt burut buter butle butte butut buzet buzzr bzzzt ebber ebbet ebble ebell eberl ebert eblul ebull ebure eeeee eeler eleet elele eleut ellel eller ellet ellul elulu eluru elute erbbe erber erere eretz errtu erte ertel erter etete etree ettel etter ettle eturu etzel euell euler eurel eurre euzet ezell lebel leber lebet leell leere leert leez leeze leleu lelle lerer lerez letbe letre lette letur leuze lubbe luber luble lubur lubz lulle lulte lulul lurer lurue lute- luter lutte luzer luzzu rebbe rebel reber rebet rebut reelz reere reetz reeze relee relet relte relue rere- reree reret rerez retee retel reter rette reuel reuer reuet reule reute reuze rezel rubee rubel ruber ruble ruele ruell ruere ruete ruetz ruler ruter rutle rutte rutul ruule ruutu tbtbt tbutt teber tebet teele teell tele- teler teleu tell- telle teret tereu terre tert- tetel teter tetle tetr- tette tezel tlell tlett tllbr treer treet trele trere trete trett treut trubu truel truer trule trull trute ttttt tuber tubul tuell tuelt tulet tulez tulle turbe turbt turel turet turle turre turtu turul turut turze tutee tutel tutle tutte tuuru tzere tzute ubble uber- ubrez uetze ullet ullur ultre ululu uluru urelu urtel urter urtlu urubu urutu urzut uter- utter uttur utube uturu uuuuu uzere uzzle z-ter zbure zebre zebub zebul zeele zelet zelle zerbe zerre zetel zeuet zlebe zrbtt zu-zu zuber zuelz zulte zzzzz

b-reel b-tree bbbbbb beblur beebee beeler beerze beeter beetle beezel beezer belber belett beller bellet belleu bellue beltel belter beltre belull belute belzer berbee berber bereel bereet berere berrer berret bertel bertre berube betell betelu betere betete betrue bettee bettel better bettle betutu betzet beurre bezell bezzle bleere bleeze blublu bluett blurre bluter brebel breere breeze brette breuer brubru bruel brulee bruree brutel brzuze bubber bubble bubele bububu bueler buellt bulbel bulbul bull-e bullee