-er b-u bbb bbe bbg bbo bbr bbt bbu be- beb bee beg beo ber bet beu bgb bge bgg bgo bgr bgt bgu bob boe bog boo bor bot bou brb bre brg bro brr brt bru btb bte btg bto btr btt btu bub bue bug buo bur but buu ebb ebe ebg ebo ebr ebt ebu eeb eee eeg eeo eer eet egb ege egg ego egr egt egu eo- eob eoe eog eoo eor eot eou erb ere erg ero err ert eru etb ete etg eto etr ett etu eu- eub eue eug eur eut gbe gbg gbo gbr gbt gbu ge- geb gee geg geo ger get geu ggb ggg ggo ggr ggt ggu gob goe gog goo gor got gou grb gre grg gro grr grt gru gtb gte gtg gto gtr gtt gtu gu- gub gue gug guo gur gut guu ob- obb obe obg obo obr obt obu oeb oee oeg oeo oer oet oge ogg ogo ogt oo- oob oog ooo oor oot or- orb ore org oro orr ort oru ot- otb ote otg oto otr ott otu ou- oue ouo our out rbb rbe rbg rbo rbr rbt rbu re- reb ree reg reo rer ret reu rgb rge rgg rgo rgr rgt rob roe rog roo ror rot rou rrb rrg rrr rrt rru rtb rte rtg rto rtr rtt rtu rub rue rug ruo rur rut ruu tbb tbe tbg tbo tbr tbt tbu te- teb tee teg teo ter tet teu tgb tge tgg tgo tgr tgt tgu to- tob toe tog too tor tot tou trb tre trg tro trr trt tru ttb tte ttg tto ttr ttt ttu tub tue tug tuo tur tut tuu ubb ube ubg ubo ubr ubt ubu ueb uee ueg uer uet ugb uge ugg ugo ugr ugt ugu uob uoe uog uoo uor uot ur- urb ure urg uro urr urt uru utb ute uto utr utt utu uue uug uur uut uuu

bbbb bbeb bbet bbrg bebb bebe bebo beeb beeg beer beet begg bego begu beo- beor beot bere berg bero berr bert beru bete beto bett betu beur bobb bobe bobo bobu boee boeo boer boet boge bogg bogo bogt boob booe boog boor boot bor- bore borg boro borr bort boru botb bote boto bott boue bour bout breb bree breg breo brer bret brob broe brog broo bror brot brou brrr brue brug brut btob btor btrt bttb bubb bube bubo bubu buer bueu buge bugg bugo bur- burb bure burg buro burr burt buru but- bute buto butt ebbo ebbr eber eboe eboo ebor ebro ebru ebur eeee eerg eero eete eetu egbe egbu egee eger eggb egge eggo ego- egor egot egre egte eore eoto erbb erbe ereb erer eret erg- ergg ergo erob eroe eroo erre erro ertu erub erur etbr etee eter etoe etre etro ette etto ettu euer euge eur- eure euro eurt gbbo gebe geer geet gege gegg gego geo- geog gerb gere gero gert geru getb gete getg geto gett geue ggbt gggg gobe gobo goer gogo goog goor goot gorb gore gorg goro gorr gort gote goto gott gou- goug gour gout grbr greb gree greg gret greu grob grog groo gror grot grou grrr grub grue grug grur grut gtbr gtoe gubb gubu guer gugb guge gugg gugu gurb gure gurg guro gurr gurt guru gute guto gutt gutu o-eo obbo ober obet oboe obor obot obre obro oegb oere ogb ogbe ogee oger ogge ogog ogou ogre ogro oobe ooer oooo oore oort ootb orbb orbe orbo orbu ore- oreb oreg oreo orer orge orgo oro- oroe oror orot orro orte orto orub otee oter oto- otoe otog otoo otor otre otro otte otto ottu otur ouer ouge our- oure ouro ourt out- outb oute outo ouu- rbbb rbbr rebb rebe rebo rebu reeb reet rege rego regr regt regu reog reot reou rere rerg rero rert reru rete reto retr rett reue reut reuu rgbe rgtr rob- robb robe robo robt robu roeg roer roet roge rogg rogo roob roog roor root rore roro rort roru rote rotg roto rotr rott roub roue rout rrrr rtee rubb rube rubu ruer ruet ruge rugg rure ruro ruru rute ruto rutt rutu tbrb tebo tebu teer teet tegg tego tegt tegu teor ter- tere tero terr teru tete teto tetr tett tetu teut tobe tobo tobt tobu toee toer toet toge togo togr togt toor toot tore torg toro torr tort toru tote toto totr tott toug tour tout tre- tree treg treo tret treu trge troe trog troo trot trou trte trtr trub true trug trut truu ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tuer tuet tugg tugu tuor turb ture turg turo turr turt turu tute tuto tutt tutu tuuo ubbe ubbo uber ubet ugeo uggo uggt ugro ugur uguu uor- uore urbe ure- uret urge urgu uro- uroo urre urte urur urut uter utor utto uttu utug uuuu

-tree bbbee be-er be-ro beber bebog bebot beebe beete beeut begee beget begge begob begor begot begto begue begur begut beote beour berbe bereg beret berge berob beroe beror berre berru berte berto betee beter betoo betor betou betre bett- bette betto beuer beure beute bo-bo bobet bobr bobre boege boero boeur boger boget bogge bogoe bogor bogot bogu bogue bogur bogut booer boore boort booru borbo boree borer boret borge borgo borgu boro- boroo borot borou borre borro borut botet botou botro botte bottu bouee bouer bouet bouge boure bourg boute bouto brebu breer breet breg- brege bregg breo- brere breto brett breu- brobo broer broto broue brout brrrr bruer bruet bruge brugg brute btr-t bubbe buber buger bugge bugoo bugre buret burge burgo burgu buroo burro burru burte burtt burut buteo buter buto- butor butot butou butte butuo butut ebber ebbet eberg ebert eboue ebure eeeee egger egret eorre erbbe erber erege erere ergo- ergot eroge eroor