-er eee eef eek eer ees eet ef- efe eff efr efs eft eke ekf ekr eks ekt ere erf erk err ers ert es- ese esf esk esr ess est ete etf etk etr ets ett fee fef fek fer fes fet ffe fff ffk ffr ffs fft fkf fkk fkt fre frf frk frr frs frt fse fsf fsk fsr fss fst fte ftf ftk ftr fts ftt k-t ke- kee kef kek ker kes ket kff kfs kke kkk kkr kks kkt krf krk krr krs krt kse ksf ksk ksr kss kst kte ktf ktk ktr kts ktt re- ree ref rek rer res ret rfe rff rfk rfr rfs rft rke rkf rkk rks rkt rrf rrk rrr rrs rrt rse rsf rsk rsr rss rst rte rtf rtk rtr rts rtt se- see sef sek ser ses set sfe sff sfk sfr sfs sft sk- ske skf skk skr sks skt sr- sre srf srk srr srs srt ss- sse ssf ssk ssr sss sst ste stf stk str sts stt te- tee tef tek ter tes tet tfe tff tfk tfr tfs tft tke tkk tkr tks tkt tre trf trk trr trs trt tse tsf tsk tsr tss tst tte ttf ttk ttr tts ttt

eeee eees eefe eeke eeks eers eese eesk eete eets efes efet effs efke eft- efts ekek eker ekes eket erer eres eret erfs erft erke erks erre errs erse erst erts esee esek eser eses eset esfs eske esks esse esst este estr ests etee eter etes etfe etre ette f--k feek feer fees feet fefe feff feke fere ferk ferr fers fert fese fess fest fete fetr fets fett ffee ffff ffrr ffss fftf free fres fret frst fssf fter ftrs ftse ftsr keef keek keer kees keet keff kefr kefs keft keke keks ker- kere kerf kerk kerr kers kert kesk kesr kess kest ket- kete ketf ketk ketr kets kett kfer kfff kffk kfre kfrr kfrs kfse kfsk kfsr kfst kfte kftk kftt kkfr kkfs kkft kkkk kkre kkrf kkrk kkrr kkrs kkrt kkse kksf kksr kkss kkst kktk kkts kree kref krek kres kret krfe krff krfs krft krke krkk krkr krks krre krrf krrk krrr krrs krrt krse krsf krsk krsr krss krst krtk krtr krts ksee ksek kser kset ksfe ksfr ksft kske kskf kskk kskr ksks ksrf ksrr ksrs ksrt ksse kssr ksss ksst kste kstk kstr ksts kstt ktee ktek ktfs ktke ktkk ktkr ktks ktkt ktre ktrf ktrk ktrr ktrs ktrt ktsf ktsr ktst kttf kttk kttr ktts kttt reef reek rees reet refe reff refr refs reft reke reks rekt rere rers rert rese ress rest rete retr rets rett rfef rkkf rkss rkts rrrr rsee rsre rsts rtee rtes rtss rtts se-e se-f se-k se-s se-t seef seek seer sees seet seff seft seke sekk sekt sere serf serk serr sers sert sese sess sest set- sete setf sets sett sfer sfss sfts skee sker skes sket skrt skss sres srtr ssee sses sset ssrs sssf ssss ssts stee stef stek ster stes stet stks stre strk strs stsf stss sttr teef teek teer tees teet teff teft teke ter- tere terf terk terr ters tese tess test tete tetr tets tett tfrs tfss tkts tre- tree tref trek tres tret trfr trst trte trtr tses tset tsks tsse tssf tssr tsst tsts tter ttff ttss tttt

-tree eeeee ef-ts efere efetf effer effet effts efter ekers ekker erere eresk erest erets erres erses erste ersts erte erter ertes esere esker esref esser esses essse estee ester estes estet estre eteke etest etete etree etrek etres etter ettes feere feers feese feets feres feret ferr- ferre ferse ferte feser fesse fest- feste fests feter fetes fette freek freer frees freet freke frere frese fress frest frets frett fseek ftest ftrtt k-set keefe keeks keere keest keets kefee kerek keres keret kerfs kerre kerrs kerse kerss keser kesse keste ketek keter kette kfest kreef kreek krees kreke kresk kress krest krete reefe reefs reeft reeks reere reese reesk reest refer refet reffe refts rekke rere- reree reres reret resee reses reset reske resse reste restr rests retee reter retes rette retts rsssf rt-rk seeke seeks seere seers seese seest seete sefer sefes seffe sefte seker sekes sekke seref serer seres seret serfe serff serfs serke serre serse serss sert- serte serts seser seses sesse seste setee seter setse setsf sette setts skeer skees skeet skere skerf skers skete skrte sssss steek steer stees steet steff steke stere sterk sterr sters stert stete stets stker stree strek stret strrs teers teese teest teets tefe teffs tekes teket tekke terek teres teret terre terrs terse tersk tert- tesse teste tests teter tetes tetr- tette treer trees treet trefe treff trefs treks trere tres- trese tress trest trete trets trett trsek tsere tsets ttest ttttt

effere effete efreet efter- efters eretes errest errett erster eskers eskert eskett essert essess esssse estees esters estree estres estter esttes f-test feeres feeses fekete ferfer ferrer ferres ferret fertee fertek ferter fesere fesser fesses fester fetter fettes freers freese freest frefre freres fresse fresst frette fretts fterer fterre k-tree keefer keeffe keeker kefefs keftes kekes kereft kereks kerker kersee kerser kertee kesses kester ketter kreese krefft kreker kresek kresse kreste kretek r-tree reefer reeffe reeker reekes reeser reeses reests refeet refeff refers refert refete refret refter rerees reseek resees resets resket rester restes restte reteer retees reteet retere retest retree retret retter see-er seeker seesee sekere sekret serefe serere serers serest serket serre- serres serret sesser sesses sester sestet sestre setees seters setfee settee setter skeets skerre skreef skreek sssfrs steeks steere steers stere- sterer steres sterke sterks sterre sterte steske streek street streke stress strete t-test t-tree teerts teests teetee teeter tekkes terese terete terets terrer terres terret terser terset terter tertre teseke tesker tesser tesses testee tester testes teteks tetete tetter treete treets trefet trefte treker trekse tresse tretee tretes trette