-er b-u bbb bbe bbl bbr bbt bbu be- beb bee bel ber bet beu blb ble bll blr blt blu brb bre brl brr brt bru btb bte btl btr btt btu bub bue bul bur but buu ebb ebe ebl ebr ebt ebu eeb eee eel eer eet elb ele ell elr elt elu erb ere erl err ert eru etb ete etl etr ett etu eu- eub eue eul eur eut lbb lbe lbl lbr lbt lbu leb lee lel ler let leu llb lle lll llr llt llu lrb lrr lrt lru ltb lte ltl ltr ltt ltu lub lue lul lur lut luu rbb rbe rbl rbr rbt rbu re- reb ree rel rer ret reu rle rll rlr rlt rlu rrb rrl rrr rrt rru rtb rte rtl rtr rtt rtu rub rue rur rut ruu tbb tbe tbl tbr tbt tbu te- teb tee tel ter tet teu tle tll tlr tlt tlu trb tre trl trr trt tru ttb tte ttl ttr ttt ttu tub tue tul tur tut tuu ubb ube ubl ubr ubt ubu ueb uee uel uer uet ulb ule ull ulr ult ulu ur- urb ure url urr urt uru utb ute utl utr utt utu uue uur uut uuu

bbbb bbeb bbet bblb bebb bebe beeb beel beer beet bele bell belt belu bere berr bert beru bete bett betu beur blbt bleb blee blet bleu blub blue blur blut breb bree brel brer bret brrr brue brut btrt bttb bubb bube bubu buel buer bueu bulb bule bull bult bulu bur- burb bure burl burr burt buru but- bute butt ebbr ebel eber ebru ebul ebur eeee eele eete eetu el-b elbe elbu elee eler elet elle ellu elte elue elul erbb erbe ereb erel erer eret erle erll erre ertl ertu erub erur etbr etee etel eter etre ette ettu euer eule eur- eure eurt lblr lbrt le-u lebu leel leer leet lele lell lelu lere lert lete lett leur llet lleu llll lrrr ltbl ltee lttr lube luer lule lull lulu lure lurt lute rbbb rbbr rble rebb rebe rebu reeb reel reet relb rele rell relt rere rert reru rete retr rett reue reul reut reuu rlee rleu rrle rrrr rtee rtle rtlt rubb rube rubu ruel ruer ruet rule rull rure ruru rute rutl rutt rutu tbrb tebu teel teer teet tel- tele tell telt telu ter- tere terr teru tete tetr tett tetu teut tre- tree tret treu 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 ubbe uber ubet uble uele uell uleb ulee ulle ullr ultt ulul urbe ure- uret urle urre urte urur urut utel uter uttu uulu uuuu

-tree bbbee be-er bebel beber beebe beele beete beeut belee belet bellb belle belue belur belut berbe berel beret berle berre berru berte betee betel beter betle betre bett- bette betul beuer beule beure beute bleer bleet blere blete bleue bluer bluet blurb blure blurr blurt brebu breel breer breet brell brere brett breu- brrrr bruer bruet brule brull brute btr-t bubbe buber buble buell bulb- bull- bulle bulul bulut burel buret burle burru burte burtt burut buter butle butte butut ebber ebbet ebble ebell eberl ebert eblul ebull ebure eeeee eeler eleet elele eleut ellel eller ellet ellul elulu eluru elute erbbe erber erere errtu erte ertel erter etete etree ettel etter ettle eturu euell euler eurel eurre lebel leber lebet leell leere leert leleu lelle lerer letbe letre lette letur lubbe luber luble lubur lulle lulte lulul lurer lurue lute- luter lutte rebbe rebel reber rebet rebut reere relee relet relte relue rere- reree reret retee retel reter rette reuel reuer reuet reule reute rubee rubel ruber ruble ruele ruell ruere ruete 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 tlell tlett tllbr treer treet trele trere trete trett treut trubu truel truer trule trull trute ttttt tuber tubul tuell tuelt tulet tulle turbe turbt turel turet turle turre turtu turul turut tutee tutel tutle tutte tuuru ubble uber- ullet ullur ultre ululu uluru urelu urtel urter urtlu urubu urutu uter- utter uttur utube uturu uuuuu

b-reel b-tree bbbbbb beblur beebee beeler beeter beetle belber belett beller bellet belleu bellue beltel belter beltre belull belute berbee berber bereel bereet berere berrer berret bertel bertre berube betell betelu betere betete betrue bettee bettel better bettle betutu beurre bleere blublu bluett blurre bluter brebel breere brette breuer brubru bruel brulee bruree brutel bubber bubble bubele bububu bueler buellt bulbel bulbul bull-e bullee buller bullet bultel bulter burbet burble burbur burell burler burlet burree burrel burrer burret burtle burutu butere butler buttel butter buttle ebbert eberle eburru eebree eeuler elbert eleele ellett erbree errett ettutu eubule euller eutere lebert lebret leelee leerer leetle lerret letter lettre lubber luller lurulu lutter luttre r-tree re-let rebble rebell rebtel rebulb rebute reeler reeuel reller relleu rereel rerule reteer reteet retell retere retree retret rettel retter rettur retube returu reuele reuere reuler reulle reuter reutte rubbee rubbel rubber rubble rubell rubutu ruelle ruller rurutu ruttee rutter ruttle rutube t-tree t-tube teebee teetee teeter telele telete teleut tellee teller tellur terete terrel terrer terret terter tertre teruel tetele tetete tetter teutul trbble trebel treble trebur treete tretee trette truble truett trulle tubber tubble tubul- tubule tuelle turbel turbet turble turlet turrel turret turtle turtur tururu tutele tuteur tutter tuttle tuttul tuttut u-tube ureltu ureter urette utelle uteute

bbbbbbb bbruler bebeeru beetler beetree beletre belette belluru berbere berrett bertree berulle beutler bletter bleuler blubber bluetee bluette blurrer blutter brelett brettle brutter bubbler bubblet bueller bulblet bulbule bulette bullett bullule bulteel bultell burbler burbure burelle burette burrell buteler elbette eleuter ellerbe elteber et-tell leleble letrure lettere letterl lettret lletter lubbert rbullet re-blue rebelle reteere reterre retrete rettert reutter