-er b-u bbb bbe bbg bbr bbs bbt bbu be- beb bee beg ber bes bet beu bgb bge bgg bgr bgs bgt bgu brb bre brg brr brs brt bru bsb bse bsg bsr bss bst bsu btb bte btg btr bts btt btu bub bue bug bur bus but buu ebb ebe ebg ebr ebs ebt ebu eeb eee eeg eer ees eet egb ege egg egr egs egt egu erb ere erg err ers ert eru es- esb ese esg esr ess est esu etb ete etg etr ets ett etu eu- eub eue eug eur eus eut gbe gbg gbr gbs gbt gbu ge- geb gee geg ger ges get geu ggb ggg ggr ggs ggt ggu grb gre grg grr grs grt gru gsb gse gsg gsr gss gst gsu gtb gte gtg gtr gts gtt gtu gu- gub gue gug gur gus gut guu rbb rbe rbg rbr rbs rbt rbu re- reb ree reg rer res ret reu rgb rge rgg rgr rgs rgt rrb rrg rrr rrs rrt rru rsb rse rsg rsr rss rst rsu rtb rte rtg rtr rts rtt rtu rub rue rug rur rus rut ruu sbb sbe sbg sbr sbs sbt sbu se- seb see seg ser ses set seu sgb sge sgg sgr sgs sgt sgu sr- srb sre srg srr srs srt ss- ssb sse ssg ssr sss sst ssu stb ste stg str sts stt stu sub sue sug sur sus sut suu tbb tbe tbg tbr tbs tbt tbu te- teb tee teg ter tes tet teu tgb tge tgg tgr tgs tgt tgu trb tre trg trr trs trt tru tsb tse tsg tsr tss tst tsu ttb tte ttg ttr tts ttt ttu tub tue tug tur tus tut tuu ubb ube ubg ubr ubs ubt ubu ueb uee ueg uer ues uet ugb uge ugg ugr ugs ugt ugu ur- urb ure urg urr urs urt uru usb use usg usr uss ust usu utb ute utr uts utt utu uue uug uur uus uut uuu

bbbb bbbs bbeb bbet bbrg bebb bebe beeb beeg beer bees beet begg begs begu bere berg berr bers bert beru bes- bese bess best bete bets bett betu beur bggs bgst breb bree breg brer bres bret brrr brrs brsb brsr brst brue brug brus brut bseb bsee bseg bser bses bset bsgs bsse bsts btrt btss bttb btus bubb bube bubs bubu buer bueu buge bugg bugs bur- burb bure burg burr burs burt buru buse buss bust busu but- bute buts butt buus ebbr ebbs eber ebes ebru ebur ebus eeee eees eegs eerg eers eese eete eets eetu egbe egbu egee eger eggb egge eggs egre egss egte egts erbb erbe ereb erer eres eret erg- ergg ergs erre errs erse erst erts ertu erub erur erus esbs esee eser eses eset esse essg esst essu este estr ests esus etbr etee eter etes etre etsu ette ettu euer euge eur- eure eurt euse gbbs gebe geer gees geet gege gegg gerb gere gers gert geru gesg gess gest gesu getb gete getg gets gett geue ggbt gggg ggss grbr greb gree greg gres gret greu grrr grrs grss grub grue grug grur grus grut gsse gstr gsur gtbr gubb gubs gubu guer gues gugb guge gugg gugu gurb gure gurg gurr gurs gurt guru gusb guse guss gust gute guts gutt gutu guus rbbb rbbr rbbs rbss rbst rebb rebe rebs rebu reeb rees reet rege regr regs regt regu rere rerg rers rert reru rese ress rest rete retr rets rett reue reus reut reuu rgbe rgtr rgts rrrr rsee rsgb rsre rsts rstu rtee rtes rtgs rtss rtts rubb rube rubs rubu ruer rues ruet ruge rugg rugs rure rurs ruru ruse russ rust rusu rute ruts rutt rutu sbbs sber sbse sbst sbus se-e se-g se-s se-t se-u sebe sebs sebt seeb seeg seer sees seet seeu sege segg segs segu serb sere serg serr sers sert seru sese sess sest set- sete sets sett seur sger sges sggg sggs sgss sgts sreb sres srgb srtr srub ssbr ssee sses sset ssgs ssgt ssrg ssrs sssb ssss sstb ssts stbs stee steg ster stes stet stge stgr stre strs stru stss sttr stub stue stug stur stus stut sub- subb subg subs suee suer sues suet sueu sug- suge sugg sur- sure surg surr surs surt suru sus- suse suss sust susu sute sutu suus tbbs tbgs tbrb tbst tebu teer tees teet tegg tegs tegt tegu ter- tere terr ters teru tese tess test tete tetr tets tett tetu teut tgts tre- tree treg tres tret treu trge trst trte trtr trub true trug trus trut truu tses tset tsgt tsse tssg tssr tsst tsts ttbb tter ttss tttt tubb tube tubr tubs tubu tuer tues tuet tugg tugs tugu turb ture turg turr turs turt turu tuss tust tute tuts tutt tutu ubbe uber ubet uers uess uggs uggt ugur uguu urbe urbs ure- ures uret urge urgu urre urse urss ursu urte urts urur urus urut usbe usbr usbs usee user uses uset ussb usse ussr usss usst ussu ustb uste usts usus uter utes uttu utug uuuu

-tree bbbee bbser bbuss be-er beber bebes beebe beebs beers beest beete beets beeut begee beget begge beggs begue begur begut berbe bereg beres beret berge bergs berre berru berse berte berts berus besee beset besse beste bests besut betee beter betes betre betrs bett- bette betts betus beuer beure beust beute brebu breer brees breet breg- brege bregg brere brers brese bress brest brets brett breu- brrrr bruer brues bruet bruge brugg bruse bruss brust brute bsure btr-t btstu bubbe buber buger buges bugge bugre burbs bures buret burge burgs burgu burrs burru burse burst burte burts burtt burus burut buser buses busse bussu buste busts busur busut busuu buter butes butte butts butut ebber ebbet eberg ebers ebert ebure eeeee egers egest egeus