-er -ol b-u bbb bbe bbl bbo bbr bbt bbu be- beb bee bel beo ber bet beu blb ble bll blo blr blt blu bob boe bol boo bor bot bou brb bre brl bro brr brt bru btb bte btl bto btr btt btu bub bue bul buo bur but buu ebb ebe ebl ebo ebr ebt ebu eeb eee eel eeo eer eet elb ele ell elo elr elt elu eo- eob eoe eol eoo eor eot eou erb ere erl ero err ert eru etb ete etl eto etr ett etu eu- eub eue eul eur eut lbb lbe lbl lbo lbr lbt lbu leb lee lel leo ler let leu llb lle lll llo llr llt llu lob loe lol loo lor lot lou lrb lro lrr lrt lru ltb lte ltl lto ltr ltt ltu lub lue lul luo lur lut luu ob- obb obe obl obo obr obt obu oeb oee oel oeo oer oet olb ole oll olo olt olu oo- oob ool ooo oor oot or- orb ore orl oro orr ort oru ot- otb ote otl oto otr ott otu ou- oue oul ouo our out rbb rbe rbl rbo rbr rbt rbu re- reb ree rel reo rer ret reu rle rll rlo rlr rlt rlu rob roe rol roo ror rot rou rrb rrl rrr rrt rru rtb rte rtl rto rtr rtt rtu rub rue ruo rur rut ruu tbb tbe tbl tbo tbr tbt tbu te- teb tee tel teo ter tet teu tle tll tlo tlr tlt tlu to- tob toe tol too tor tot tou trb tre trl tro trr trt tru ttb tte ttl tto ttr ttt ttu tub tue tul tuo tur tut tuu ubb ube ubl ubo ubr ubt ubu ueb uee uel uer uet ulb ule ull ulo ulr ult ulu uob uoe uol uoo uor uot ur- urb ure url uro urr urt uru utb ute utl uto utr utt utu uue uur uut uuu

bbbb bbeb bbet bblb bebb bebe bebo beeb beel beer beet bele bell belo belt belu beo- beor beot bere bero berr bert beru bete beto bett betu beur blbt bleb blee bleo blet bleu blob bloo blot blou blub blue blur blut bobb bobe bobo bobu boee boel boeo boer boet bole boll bolo bolt bolu boob booe bool boor boot bor- bore boro borr bort boru botb bote boto bott boue boul bour bout breb bree brel breo brer bret brob broe brol broo bror brot brou brrr brue brut btob btor btrt bttb bubb bube bubo bubu buel buer bueu bulb bule bull bult bulu buol bur- burb bure burl buro burr burt buru but- bute buto butt ebbo ebbr ebel eber eboe ebol eboo ebor ebro ebru ebul ebur eeee eele eero eete eetu el-b elbe elbo elbu elee eleo eler elet elle ello ellu elro elte elto elue elul eole eolo eore eorl eoto erbb erbe ereb erel erer eret erle erll erob eroe erol eroo erre erro ertl ertu erub erur etbr etee etel eter etoe etre etro ette etto ettu euer eule eur- eure euro eurt lblr lbrt le-u lebo lebu leel leer leet lele lell lelo lelu leor leou lere lero lert lete leto lett leur llet lleu llll lloo lob- lobb lobe lobo loeb loeu lole loll lolo loob looe lool loor loot lore loro lote lotl loto lotr lott loue loul lour lout louu lrrr ltbl ltee lttr lube luer lule lull lulu lure lurt lute o-eo obbo obel ober obet oble oblu oboe obol obor obot obre obro oele oere olbo ole- oleo oler olet olle ollo olor olot oltu olur oobe ooer oolo oooo oore oort ootb orbb orbe orbo orbu ore- oreb orel oreo orer orle orlo orlu oro- oroe oror orot orro orte orto orub otee oter oto- otoe otoo otor otre otro otte otto ottu otur ouer oule oulu our- oure ouro ourt out- outb oute outo ouu- rbbb rbbr rble rebb rebe rebo rebu reeb reel reet relb rele rell relo relt reol reot reou rere rero rert reru rete reto retr rett reue reul reut reuu rlee rleu rob- robb robe robo robt robu roel roer roet role roll rolo rolt roob rool roor root rore roro rort roru rote rotl roto rotr rott roub roue roul rout rrle rrrr rtee rtle rtlt rubb rube rubu ruel ruer ruet rule rull rulo rure ruro ruru rute rutl ruto rutt rutu tbrb tebo tebu teel teer teet tel- tele tell telo telt telu teor ter- tere tero terr teru tete teto tetr tett tetu teut tobe tobo tobt tobu toee toer toet tol- tole toll tolo tolt tolu tool toor toot tore toro torr tort toru tote toto totr tott toul tour tout tre- tree treo tret treu troe troo trot trou trte trtr trub true trut truu ttbb tteo tter ttoe tttt ttul tubb tube tubo tubr tubu tuel tuer tuet tule tull tulo tulu tuor turb ture turo turr turt turu tute tutl tuto tutt tutu tuuo ubbe ubbo uber ubet uble ublo uele uell uleb ulee uleo ulle ullo ullr ulo- ulto ultt ulul uor- uore urbe ure- uret urle uro- urol uroo urre urte urur urut utel uter utor utto uttu uulu uuuu

-tree bbbee be-er be-ro bebel beber beblo bebot beebe beele beete beeut belbo belee belet bellb belle bello belot belue belur belut beote beour berbe berel beret berle berlo berob beroe berol beror berre berru berte berto betee betel beter betle betoo betor betou betre bett- bette betto betul beuer beule beure beute bleer bleet blere blete bleue bloor blorb blore blort blote bloto blott bloue blout bluer bluet blurb blure blurr blurt bluto bo-bo bobet boble bobr bobre boeol boero boeur bolbe bolel boleo boler bolet boll- bolle bollo bollu bolte bolto booer boole boore boort booru borbo boree borel borer boret borle boro- boroo borot borou borre borro borul