-er bbb bbe bbr bbs bbt bbx be- beb bee ber bes bet bex brb bre brr brs brt brx bsb bse bsr bss bst bsx btb bte btr bts btt btx bxb bxx ebb ebe ebr ebs ebt ebx eeb eee eer ees eet eex erb ere err ers ert es- esb ese esr ess est esx etb ete etr ets ett etx ex- exe exr exs ext exx rbb rbe rbr rbs rbt rbx re- reb ree rer res ret rex rrb rrr rrs rrt rsb rse rsr rss rst rsx rtb rte rtr rts rtt rtx rxr rxs sbb sbe sbr sbs sbt sbx se- seb see ser ses set sex sr- srb sre srr srs srt srx ss- ssb sse ssr sss sst ssx stb ste str sts stt stx sxs sxt t-x tbb tbe tbr tbs tbt te- teb tee ter tes tet tex trb tre trr trs trt trx tsb tse tsr tss tst tsx ttb tte ttr tts ttt ttx txe txs txt xbe xbr xbx xee xer xes xet xex xrt xrx xsb xss xst xtr xts xtx xxx

bbbb bbbs bbeb bbet bebb bebe beeb beer bees beet bere berr bers bert bes- bese bess best bete bets bett breb bree brer bres bret brex brrr brrs brsb brsr brst bseb bsee bser bses bset bsse bsts btex btrt btss bttb ebbr ebbs eber ebes eeee eees eers eese eete eets eext er-x erbb erbe ereb erer eres eret erre errs erse erst erts esbs esee eser eses eset esse esst este estr ests etbr etee eter etes etre ette exer exes exrx exte extr exts rbbb rbbr rbbs rbss rbst rebb rebe rebs reeb rees reet rere rers rert rese ress rest rete retr rets rett rexx rrrr rsee rsre rsts rtee rtes rtex rtss rtts rxes sbbs sber sbse sbst se-e se-s se-t se-x sebe sebs sebt seeb seer sees seet seex serb sere serr sers sert sese sess sest set- sete sets sett setx sex- sexe sext sreb sres srtr ssbr ssee sses sset ssex ssrs sssb ssss sstb ssts stbs stee ster stes stet stex stre strs stss sttr tbbs tbrb tbst teer tees teet ter- tere terr ters tese tess test tete tetr tets tett tetx text tre- tree tres tret trex trst trte trtr tses tset tsse tssr tsst tsts ttbb tter ttss tttt txtr xbee xeer xer- xers xert xexe xtbs xtsr xxxx

-tree bbbee bbser be-er beber bebes beebe beebs beers beest beete beets berbe beres beret berre berse berte berts besee beset besse beste bests betee beter betes betre betrs bett- bette betts bre-x breer brees breet brere brers brese bress brest brets brett bretx brrrr btr-t ebber ebbet ebers ebert eeeee erbbe erber erebs erere erest erets erres erses erste ersts erte erter ertes esere esser esses essex essse estee ester estes estet estre etest etete etext etree etres etter ettes exert exter extre extts rebbe reber rebet rebts reere reese reest rere- reree reres reret resee reses reset resse reste restr rests retee reter retes retex rette retts rexer rexes rtext sebbe sebes sebet seebe seere seers seese seest seete serbs serer seres seret serre serse serss sert- serte serts seser seses sesse seste setee seter setse sette setts sexer sexes sexst sext- sexte sexts sssrb sssss steer stees steet stere sterr sters stert stete stets strbe streb stree stret strrs t-rex tbtbt teber tebet teebs teers teese teest teets teres teret terex terre terrs terse tert- tesse teste tests teter tetes tetex tetr- tette texte texts treer trees treet trere tres- trese tress trest trete trets trett trexs tsebe tsere tsets ttest ttttt xbxrx xeres xerse xerte xetex xexex xtext xtree

b-tree bbbbbb bbsers beebee beebes beerse beerst beeste beeter berbee berber berbes bereet berere berest berets berrer berres berret bersee berset bertes bertre besbes besbre besert besets besser besses besset bester betere betete bettee better bettes bexter brebes breere breese breest breres bresse breste brests brette bretts bs-tbs e-text ebbers ebbert ebbest ebbets eberts eebree erbree eretes errest errett erster essebt essert essess esssse estees esters estree estres estter esttes etexts exerts exeter exsert exxset r-tree rebbes rebets reeser reeses reests rerees resees resets rester restes restte reteer retees reteet retere retest retree retret retter rexsee sebete sebree sebseb see-er seesee serere serers serest serre- serres serret sesser sesses sester sestet sestre setees seters setext settee setter sexers sextes sextet steber steere steers stere- sterer steres sterre sterte street stress strete t-test t-tree tbtest teebee teerts teests teetee teeter terese terete terets terrer terres terret terrex terser terset terter tertre tesser tesses testee tester testes tetete tetter texter trebes treete treets tresse tretee tretes trette trexes tsetse ttests x-tree xerert xerxes

b-trees bbbbbbb beetree berbere berbers beretts berrett bertree bestbet besteer bestest betrese betrest betters breeses bresser brettes bx-tree e-texts ersters es-tset essexes esterre estrees estreet estrete exeters exserts exterse rebetes reexert ressett resters restest reteere reterre retests retrete rettert seeress seesees seester sesters sestets sestett settees setters settest sexters sextets sssssss steerer sterres stetter streber streete streets streett t-tests tbtests teester teetees teeters terere terreer terrere terrets terrset tersest testees testers testest tetters tettete texters textese trebese treetee tresses trettre tsetses xererts xxxxxxx

bbbbbbbb bebetter berebere berstett besetter besserer bessette best-est bestbets betterer bretesse bteeters ess-tset essertes etbetter exertest resetter restress serretes sestette sex-text sextette sextress steerers steerest sterrett strebers streeter stresses t-street terester terestr- tresette tsessebe

beebeebee besetters betterest bretessee exerttrex resetters seeresses sex-texts sextettes tebe-tebe tebesbest terrestre tesserete tresserre tressette

betterbeer stresstest tersesteer

stresstests test-retest

berberberets retestsetter xerxessexrex xxxxxxxxxxxx

bbbbbbbbbbbbbbb sestetsetstests