-er bbb bbe bbg bbr bbs bbt be- beb bee beg ber bes bet bgb bge bgg bgr bgs bgt brb bre brg brr brs brt bsb bse bsg bsr bss bst btb bte btg btr bts btt ebb ebe ebg ebr ebs ebt eeb eee eeg eer ees eet egb ege egg egr egs egt erb ere erg err ers ert es- esb ese esg esr ess est etb ete etg etr ets ett gbe gbg gbr gbs gbt ge- geb gee geg ger ges get ggb ggg ggr ggs ggt grb gre grg grr grs grt gsb gse gsg gsr gss gst gtb gte gtg gtr gts gtt rbb rbe rbg rbr rbs rbt re- reb ree reg rer res ret rgb rge rgg rgr rgs rgt rrb rrg rrr rrs rrt rsb rse rsg rsr rss rst rtb rte rtg rtr rts rtt sbb sbe sbg sbr sbs sbt se- seb see seg ser ses set sgb sge sgg sgr sgs sgt sr- srb sre srg srr srs srt ss- ssb sse ssg ssr sss sst stb ste stg str sts stt tbb tbe tbg tbr tbs tbt te- teb tee teg ter tes tet tgb tge tgg tgr tgs tgt trb tre trg trr trs trt tsb tse tsg tsr tss tst ttb tte ttg ttr tts ttt

bbbb bbbs bbeb bbet bbrg bebb bebe beeb beeg beer bees beet begg begs bere berg berr bers bert bes- bese bess best bete bets bett bggs bgst breb bree breg brer bres bret brrr brrs brsb brsr brst bseb bsee bseg bser bses bset bsgs bsse bsts btrt btss bttb ebbr ebbs eber ebes eeee eees eegs eerg eers eese eete eets egbe egee eger eggb egge eggs egre egss egte egts erbb erbe ereb erer eres eret erg- ergg ergs erre errs erse erst erts esbs esee eser eses eset esse essg esst este estr ests etbr etee eter etes etre ette gbbs gebe geer gees geet gege gegg gerb gere gers gert gesg gess gest getb gete getg gets gett ggbt gggg ggss grbr greb gree greg gres gret grrr grrs grss gsse gstr gtbr rbbb rbbr rbbs rbss rbst rebb rebe rebs reeb rees reet rege regr regs regt rere rerg rers rert rese ress rest rete retr rets rett rgbe rgtr rgts rrrr rsee rsgb rsre rsts rtee rtes rtgs rtss rtts sbbs sber sbse sbst se-e se-g se-s se-t sebe sebs sebt seeb seeg seer sees seet sege segg segs serb sere serg serr sers sert sese sess sest set- sete sets sett sger sges sggg sggs sgss sgts sreb sres srgb srtr ssbr ssee sses sset ssgs ssgt ssrg ssrs sssb ssss sstb ssts stbs stee steg ster stes stet stge stgr stre strs stss sttr tbbs tbgs tbrb tbst teer tees teet tegg tegs tegt ter- tere terr ters tese tess test tete tetr tets tett tgts tre- tree treg tres tret trge trst trte trtr tses tset tsgt tsse tssg tssr tsst tsts ttbb tter ttss tttt

-tree bbbee bbser be-er beber bebes beebe beebs beers beest beete beets begee beget begge beggs berbe bereg beres beret berge bergs berre berse berte berts besee beset besse beste bests betee beter betes betre betrs bett- bette betts breer brees breet breg- brege bregg brere brers brese bress brest brets brett brrrr btr-t ebber ebbet eberg ebers ebert eeeee egers egest egger egres egret erbbe erber erebs erege erere erest erets erres erses erste ersts erte erter ertes esere esser esses essse estee ester estes estet estre etest etete etree etres etter ettes gberg geber gebet gebre geere geers geert geese geest geete gegge gerbe gerbs geres gerre gers- gerse gerss gerts gertt geser gesse geste gests getee geter gette getts grebe greer grees greet grege gregg gregs grese gress grest grete grett grrrr gsses gtsss rebbe rebeg reber rebet rebts reege reere reese reest reger reges reget regge regts regtt rere- reree reres reret resee reses reset resse reste restr rests retee reter retes retrg rette retts sebbe sebes sebet seebe seege seere seers seese seest seete segeg seger seget segge segre segrt segtb serbs serer seres seret serge sergs sergt serre serse serss sert- serte serts seser seses sesse seste setee seter setse sette setts ss-gb ssgts sssrb sssss steeg steer stees steet steg- stege stegs stere sterr sters stert stete stets stger stges strbe streb stree stret strrs tbtbt teber tebet teebs teege teers teese teest teets teges tegre teres teret terge terre terrs terse tert- tesse teste tests teter tetes tetr- tette treer trees treet treg- trere tres- trese tress trest trete trets trett tsebe tsere tsets tsgts ttest ttttt

b-tree bbbbbb bbsers beebee beebes beegee beerse beerst beeste beeter begess begets begger begtse berbee berber berbes bereet berege berere berest berets berger berrer berres berret bersee berset bertes bertre besbes besbre besege besert besets besser besses besset bester betere betete bettee better bettes brebes breege breere breese breest breger bregge breres bresse breste brests brette bretts bs-tbs ebbers ebbert ebbest ebbets eberts eebree egbere egbert egests eggers eggert egress egrets erbree eretes ergste errest errett erster essebt essert essess essgee esssse estees esters estree estreg estres estter esttes etgert g-test gbegbe gebbet gebert geegee geerts geeste geests gegger gerber gerbes gerege gerger gerges gerres gerret gertte gesbte gesees gesser gester gestes getrse getset getter grebes greers greese greest greete greets greger greges gregge greggs gregre gresse greter grette gteter r-tree rebbes rebegs rebets reeser reeses reests regess regest regret rerees resees resets rester restes restte reteer retees reteet retere retest retree retret retter seberg sebete sebree sebseb see-er seeger seerge seesee segers segert segger segreg segres serere serers serest serger serges serre- serres serret sesser sesses sester sestet sestre setees seters settee setter steber steere steers steger stere- sterer steres sterre sterte street stress strete t-test t-tree tbtest teebee teerts teests teetee teeter terese terete terets terrer terres terret terser terset terter tertre tesser tesses testee