-er eee eef eer ees eet ef- efe eff efr efs eft ere erf err ers ert eru es- ese esf esr ess est esu ete etf etr ets ett etu eu- eue euf eur eus eut fee fef fer fes fet feu ffe fff ffr ffs fft ffu fre frf frr frs frt fru fse fsf fsr fss fst fsu fte ftf ftr fts ftt ftu fue fuf fur fus fut fuu re- ree ref rer res ret reu rfe rff rfr rfs rft rfu rrf rrr rrs rrt rru rse rsf rsr rss rst rsu rte rtf rtr rts rtt rtu rue ruf rur rus rut ruu se- see sef ser ses set seu sfe sff sfr sfs sft sfu sr- sre srf srr srs srt ss- sse ssf ssr sss sst ssu ste stf str sts stt stu sue suf sur sus sut suu te- tee tef ter tes tet teu tfe tff tfr tfs tft tfu tre trf trr trs trt tru tse tsf tsr tss tst tsu tte ttf ttr tts ttt ttu tue tuf tur tus tut tuu uee uef uer ues uet ufe uff ufr ufs uft ufu ur- ure urf urr urs urt uru use usf usr uss ust usu ute utf utr uts utt utu uue uur uus uut uuu

eeee eees eefe eers eese eete eets eetu efes efet effs eft- efts eftu erer eres eret erfs erft erre errs erse erst erts ertu erur erus esee eser eses eset esfs esse esst essu este estr ests esuf esus etee eter etes etfe etre etsu ette ettu euer eur- eure eurt euse feer fees feet fefe feff fere ferr fers fert feru fese fess fest fete fetr fets fett fetu feus ffee ffff ffrr ffss fftf free fres fret frst frue fssf fter ftrs ftse ftsr fuet fuff fufu fur- fure furr furs furt fuse fuss fust fusu fute futs futu reef rees reet refe reff refr refs reft refu rere rers rert reru rese ress rest rete retr rets rett reue reuf reus reut reuu rfef rrrr rsee rsre rsts rstu rtee rtes rtss rtts ruer rues ruet rufe ruff ruft rure rurs ruru ruse russ rust rusu rute ruts rutt rutu se-e se-f se-s se-t se-u seef seer sees seet seeu seff seft sere serf serr sers sert seru sese sess sest set- sete setf sets sett seur sfer sfss sfsu sfts sres srtr ssee sses sset ssrs sssf ssss ssts stee stef ster stes stet stfu stre strs stru stsf stss sttr stue stuf stur stus stut suee suer sues suet sueu suf- suff sufr sufs sufu sur- sure surf surr surs surt suru sus- suse suss sust susu sute sutu suus teef teer tees teet teff teft ter- tere terf terr ters teru tese tess test tete tetr tets tett tetu teut tfrs tfss tre- tree tref tres tret treu trfr trst trte trtr true trus trut truu tses tset tsse tssf tssr tsst tsts tter ttff ttss tttt tuer tues tuet tufe tuff tuft tufu ture turf turr turs turt turu tuss tust tute tuts tutt tutu uers uess ufer uffe ure- ures uret urfe urff urft urre urse urss ursu urte urts urur urus urut usee usef user uses uset usfs usse ussf ussr usss usst ussu uste usts usus uter utes uttu uutf uuuu

-tree eeeee ef-ts ef-tu efere efetf effer effet effts efter efuru efuse efutu erere erest erets erres errtu erses erste ersts erte erter ertes eruts esere esref esser esses essse essue estee ester estes estet estre estur estus esure etest etete etree etres etter ettes eturu eurre eurus euser feere feers feese feets feres feret ferr- ferre ferse ferte ferus feser fesse fest- feste fests festu feter fetes fette fetus feuer feurs feute freer frees freet frere frese fress frest frets frett freur frust frute ftest ftrtt fu-fu fuest fuffs furrs furse furst furus fusee fuser fuses fusse fuste fusts fusus futsu futur fuuse reefe reefs reeft reere reese reest refer refet reffe refts refus refut rere- reree reres reret resee reses reset resse reste restr rests resue resus retee reter retes retsu rette retts reuer reuet reuse reuss reute rsssf rsust ruere ruers ruete ruffe ruffs rufus ruses russe ruste rusts rustu ruter rutte ruutu seere seers seese seest seesu seete sefer sefes seffe sefte seref serer seres seret serfe serff serfs serre serse serss sert- serte serts serue serut seser seses sesse seste sestu sesue setee seter setse setsf sette setts settu setus setut seuer seure seuss seute sssss steer stees steet steff stere sterr sters stert stesu stete stets steur stree stret streu strrs strue strut stuer stufe stuff stuft sture sturt stuse stuss stute stuue suere suers suess suest suete suets sueur sufes suffe suffr suffs suftu surer sures surfs surre surte surtr surur surus suser suses susse susus sutee suter sutes sutte suttu teers teese teest teets tefe teffs teres teret tereu terre terrs terse tert- tesse teste tests teter tetes tetr- tetsu tette teuts treer trees treet trefe treff trefs trere tres- trese tress trest trete trets trett treus treut truer trues truff truse truss trust trute truus tsere tsets tsuru tsuur ttest ttttt tuffe tuffs tufte tufts turet turfs turre turse turss turst tursu turtu turut tutee tutte tutus tuuru ufere ufeus ursus urter urutu usees users usest usses uster ustur usure usutu uter- utfse utfsf utter uttur uturu uuuuu

effere effete effuse effutu efreet efter- efters erestu eresus eretes erfurt errest errett erster ersure essert essess esssse essure estees esters estree estres estrus estter esttes esture ettutu eutere f-test feeres feeses ferfer ferrer ferres ferret ferrur ferrus fertee ferter fesere fesser fesses fester festue festus fetter fettes feture feuter freers freese freest frefre freres fresse fresst frette fretts freure fruste fterer fterre fuerse fuerst fuerte furfur furrer furres furrfu fusees fusers fusser fusses fuster fustet fusure futret futter futtsu future r-tree re-use reefer reeffe reeser reeses reests refeet refeff refers refert