-er bbb bbe bbf bbr bbt be- beb bee bef ber bet bez bfb bfe bff bfr bft bfz brb bre brf brr brt brz btb bte btf btr btt btz bze bzf bzr bzz ebb ebe ebf ebr ebt eeb eee eef eer eet ef- efb efe eff efr eft erb ere erf err ert erz etb ete etf etr ett etz eze ezf ezr ezz fbb fbe fbf fbr fbt feb fee fef fer fet fez ffe fff ffr fft ffz frb fre frf frr frt ftb fte ftf ftr ftt ftz rbb rbe rbf rbr rbt re- reb ree ref rer ret rez rfb rfe rff rfr rft rfz rrb rrf rrr rrt rtb rte rtf rtr rtt rtz rzb rze tbb tbe tbf tbr tbt tbz te- teb tee tef ter tet tez tfb tfe tff tfr tft trb tre trf trr trt trz ttb tte ttf ttr ttt tze tzf zbb zbr zbt zeb zee zef zer zet zez zfr zte ztr zzr zzt zzz

bbbb bbeb bbet bebb bebe beeb beef beer beet befe beff beft bere berr bert bete bett betz beze bftt bftz breb bree bref brer bret brez brrr btrt bttb bzer bzzt bzzz ebbr eber eeee eefe eete eeze efbr efet eft- efze erbb erbe ereb erer eret erez erft erre ertz etbr etee eter etfb etfe etre ette ezer feeb feer feet fefe feff ferb fere ferr fert ferz fete fetr fett ffee ffff ffrr fftf free fret frzb fter fzzt rbbb rbbr rebb rebe reeb reef reet refe reff refr reft rere rert rete retr rett retz reze rfef rrrr rtbf rtee rtfb tbrb teef teer teet teez teff teft ter- tere terf terr tete tetr tett tetz tezz tfeb tre- tree tref tret trez trfr trte trtr ttbb tter ttff tttt tzzt zber zebe zeff zerf zert zete zeze zrze zzzz

-tree bbbee be-er beber beebe beeft beete beez beffe berbe beret berre berte berze betee beter betre bett- bette bezer breef breer breet brere brett bretz breze brrrr btr-t bzzzt ebber ebbet ebert eeeee efere efetf effer effet efter erbbe erber erere eretz erte erter etete etree etter febre feere feeze feret ferr- ferre ferte feter fette freer freet frere frett ftrtt fzbrf rebbe reber rebet reefe reeft reere reetz reeze refer refet reffe rere- reree reret rerez retee reter rette tbtbt teber tebet tefe teret terre tert- teter tetr- tette treer treet trefe treff trere trete trett ttttt tzere z-ter zebre zerbe zerre zfeet zrbtt zzzzz

b-tree bbbbbb beebee beefer beerze beeter beezer befree befret berbee berber bereet bereft berere berrer berret bertre betere betete bettee better betzet breefe breere breeze brette ebbert eebree effere effete efreet efter- erbree errett etrez ferber ferez ferfer ferrer ferret ferrez fertee ferter fetter fetzer freeez freeze frefre frette fterer fterre r-tree reefer reeffe refeet refeff refert refete refret refter reteer reteet retere retree retret retter t-tree teebee teetee teeter terete terfez terrer terret terter tertre terzet tetete tetter treete trefet trefte tretee trette tzetze zeebee zerbet zertz zezere

bbbbbbb be-free beetree berbere berefet berrett bertree betbeze febreze ferebee ferrere freebee freeter freezer fretter referee referer refrete rerefer reteere reterre retrete rettert terere terreer terrere tettete trebez treetee trettre zbereze zerbert

bbbbbbbb bebetter befetter befreeze berebere betterer erezee etbetter ferreter ferrette fetterer freebeer referree referrer refreeze treefree trezerer

beebeebee tebe-tebe

betterbeer ferretfeet

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