-er bbb bbe bbm bbr bbs bbt be- beb bee bem ber bes bet bmb bme bmm bmr bms bmt brb bre brm brr brs brt bsb bse bsm bsr bss bst btb bte btm btr bts btt ebb ebe ebm ebr ebs ebt eeb eee eem eer ees eet em- emb eme emm emr ems emt erb ere erm err ers ert es- esb ese esm esr ess est etb ete etm etr ets ett m-r mbb mbe mbm mbr mbs mbt meb mee mem mer mes met mmb mme mmm mmr mms mmt mrb mre mrm mrr mrs mrt msb mse msm msr mss mst mtb mte mtm mtr mts mtt rbb rbe rbm rbr rbs rbt re- reb ree rem rer res ret rmb rme rmm rmr rms rmt rrb rrm rrr rrs rrt rsb rse rsm rsr rss rst rtb rte rtm rtr rts rtt sbb sbe sbm sbr sbs sbt se- seb see sem ser ses set smb sme smm smr sms smt sr- srb sre srm srr srs srt ss- ssb sse ssm ssr sss sst stb ste stm str sts stt tbb tbe tbm tbr tbs tbt te- teb tee tem ter tes tet tmb tme tmm tmr tms tmt trb tre trm trr trs trt tsb tse tsm tsr tss tst ttb tte ttm ttr tts ttt

bbbb bbbs bbeb bbet bebb bebe beeb beem beer bees beet beme bere berm berr bers bert bes- bese besm bess best bete bets bett bmts breb bree brem brer bres bret brrm brrr brrs brsb brsr brst bseb bsee bser bses bset bsms bsmt bsrm bsse bssm bsts btrt btss bttb ebbr ebbs eber ebes eeee eees eems eers eese eete eets embe embr embs emer emes emet emme emms emre emrs emse emst emte emts erbb erbe ereb erem erer eres eret erme erms erre errs erse erst erts esbs esee esem eser eses eset esme esmr esmt esse esst este estr ests etbr etee etem eter etes etre etrm ette mbbs mbes mbms mbrs mebe meem meer mees meet meme memr mems mer- merb mere merm mers mert mes- mese mesr mess mest met- mete mets mett mmes mmmm mmms mmse mmst mmts mrbb mrbm mrbs mreb mree mres mrse mrtm mrts mrtt msee msem msmb msmm msms msrb msrt mssm mssr msst mstr msts mtbs mtre mtrr mtss mtst mttr mtts rbbb rbbr rbbs rbms rbss rbst rebb rebe rebs reeb reem rees reet reme rems rere rers rert rese ress rest rete retr rets rett rmbs rmst rrrr rsee rsme rsre rsts rtee rtes rtms rtss rtts sbbs sber sbse sbst se-e se-s se-t sebe sebs sebt seeb seem seer sees seet seme sems serb sere serm serr sers sert sese sess sest set- sete sets sett smbe smeb smee smet smrt smss smte sreb srem sres srtr ssbr ssee ssem sses sset ssrm ssrs sssb sssm ssss sstb ssts stbs stee stem ster stes stet stms stmt stre strs stsm stss sttr tbbs tbrb tbst teem teer tees teet teme tems ter- tere term terr ters tese tess test tete tetr tets tett tmbr tmtt tre- tree trem tres tret trmb trms trst trte trtr tses tset tsse tssm tssr tsst tstm tsts ttbb tter ttms ttss tttt

-tree bbbee bbser be-er beber bebes beebe beebs beers beest beete beets bembe bemer bemet berbe beres beret berme berms berre berse berte berts besee besem beset besme besse beste bests betee beter betes betre betrs bett- bette betts bmrst breem breer brees breet breme bremm brems brere brers brese bress brest brets brett brmmm brrrr btr-t bttms ebber ebbet ebers ebert eeeee embee ember emeer emere emert emese emmer emmet emtee erbbe erber erebs erem- erere erest erets ermes erres erses erste ersts erte erter ertes esere esmes esser esses essse estee ester estes estet estre etest etete etree etres etter ettes m-set mbebe mbere mbres mbret mebbe meees meems meere meers meese meest meete meets membe memer memes merer meres meret merms merre merse merss merte mesee mesem meses messe meste meter metes metr- metre metse mette metts mmmmm mrmet mt-te mt-tm mt-tr mt-tt mtree rebbe reber rebet rebts reeme reere reese reest remee remer remet remse rere- reree reres reret resee reses reset resse reste restr rests retee retem reter retes rette retts rtems sebbe sebes sebet seebe seeem seeme seems seere seers seese seest seete semee semes semet semme serbs serer seres seret serme serre serse serss sert- serte serts seser seses sesse seste setee setem seter setme setse sette setts smees smeet smere smert smets sssrb sssss steem steer stees steet stemm stems stere sterr sters stert stete stets strbe streb stree strem stret strrs strsm tbtbt teber tebet teebs teeme teems teers teese teest teets tembe temes temse terem teres teret terme terms terre terrs terse tert- tesem tesse teste tests teter tetes tetr- tette treer trees treet treme trere tres- trese tress trest trete trets trett tsebe tsere tsets tsmmr ttest ttttt

b-tree bbbbbb bbsers beebee beebem beebes beembe beemer beerme beerse beerst beeste beeter bemeet bemete berbee berber berbes bereet berere berest berets bermet berrer berres berret bersee berset bertem bertes bertre besbes besbre beseem besert besets besser besses besset bestem bester beteem betere betete bettee better bettes brebes breere breese breest bremer bremes bremse breres bresse breste brests brette bretts bs-tbs ebbers ebbert ebbest ebbets eberts eebree embers embree emeere emeers emeese emerse emeses emeter emmers emmert emmets emmett erbree eretes errest errett erster essebt essert essess esssse esteem estees esters estree estres estter esttes m-tree mbembe meeses meeter meetme meetre member membre mememe memere merese merest merete mermer mermet merrem merret merser merter mesmer messer messes messet messrs mestee mester mestes mestre meteer meters metest metrer metres metste metter mettet mrsmee mrsmet mstest r-tree rebbes rebets reeser reeses reests remeet remete rerees resees resets restem rester restes restte reteer retees reteet retere reterm retest retree retret retter sebete sebree sebseb see-er