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-tree bbbee bbser bbuss be-er beber bebes beebe beebs beefs beeft beers beest beete beets beeut beffe befur begee beget begge beggs begue begur begut berbe bereg beres beret berge bergs berre berru berse berte berts berus besee beset besse beste bests besut betee beter betes betre betrs bett- bette betts betus beuer beure beust beute brebu breef breer brees breet breg- brege bregg brere brers brese bress brest brets brett breu- brrrr bruer brues bruet bruff bruge brugg bruse bruss brust brute bsure btr-t btrfs btstu bubbe buber bufet buffe buffs buger buges bugge bugre burbs bures buret burge burgs burgu burrs burru burse burst burte burts burtt burus burut buser buses busse bussu buste busts busur busut busuu buter butes butte butts butut ebber ebbet eberg ebers ebert ebure eeeee ef-ts ef-tu efere efetf effer effet effts efter efuru efuse efutu egers egest egeus egger egres egret erbbe erber erebs erege erere erest erets erres errtu erses erste ersts erte erter ertes ertug erubs eruts esbus esere esref esser esses essse essue estee ester estes estet estre estur estus esure etest etete etree etres etter ettes eturu euges eurre eurus euser febre feebs feere feers feese feets fegue feres feret ferr- ferre ferse ferte ferus feser fesse fest- feste fests festu feter fetes fette fetus feuer feuge feurs feute fgets freer frees freet frege frere frese fress frest frets frett freur frust frute ftest ftrtt fu-fu fubbs fubus fuest fuffs fugee fuger fugue fugug fugus furrs furse furst furus fusee fuser fuses fusse fuste fusts fusus futsu futur fuuse gberg gberu gbfte geber gebet gebre gebur geere geers geert geese geest geete gefte gegge gerbe gerbs geres gerre gers- gerse gerss gerts gertt geruf geser gesse geste gests getee geter gette getts grebe greef greer grees greet grefe greff grege gregg gregs grese gress grest grete grett greut grftr grgur grrrr grubb grube grubs grues grufe gruff gruft grure gruse gruss grust gruts gruut gsbfr gsses gtsss gtube gubbe guber gubru guere guess guest guffs gurge gurre gurse gursu gurts gurur gurus guste gusts gustu gutte rebbe rebeg reber rebet rebts rebus rebut reefe reefs reeft reege reere reese reest refer refet reffe refts refus refut reger reges reget regge regts regtt regur regus regut rere- reree reres reret resee reses reset resse reste restr rests resue resus retee reter retes retrg retsu rette retts reuer reuet reuse reuss reute rsssf rsust rubee ruber rubes rubus ruegg ruere ruers ruete ruffe ruffs rufus ruger ruget rugge ruses russe ruste rusts rustu ruter rutte ruutu s-bus sebbe sebes sebet seebe seege seere seers seese seest seesu seete sefer sefes seffe sefte segeg seger seget segge segre segrt segtb segub segue segur segus serbs seref serer seres seret serfe serff serfs serge sergs sergt serre serse serss sert- serte serts serue serug serut seser seses sesse seste sestu sesue setee seter setse setsf sette setts settu setus setut seuer seuge seure seuss seute ss-gb ssgts sssrb sssss steeg steer stees steet steff steg- stege stegs stere sterr sters stert stesu stete stets steur stger stges strbe streb stree stret streu strrs strub strue strug strut stube stubs stuer stufe stuff stuft sturb sture sturt stuse stuss stute stuue subbu suber subss subst suere suers suess suest suete suets sueur sufes suffe suffr suffs suftu suger suget sugge suggs sugru sugus sugut surer sures surfs surge surgu surre surte surtr surur surus suser suses susse susus sutee suter sutes sutte suttu tbtbt tbutt teber tebet teebs teege teers teese teest teets tefe teffs teges tegre tegur tegus teres teret tereu terge tergu terre terrs terse tert- tesse teste tests teter tetes tetr- tetsu tette teuge teuts treer trees treet trefe treff trefs treg- trere tres- trese tress trest trete trets trett treus treut trubs trubu truer trues truff trugg trugs truse truss trust trute truus tsebe tsere tsets tsgts tsuge tsuru tsuur ttest ttttt ttusb tubbs tuber tubes tuffe tuffs tufte tufts turbe turbt turet turfs turre turse turss turst tursu turtu turut tutee tutte tutus tuuru uber- ubers ufere ufeus ugrug urbes urger urges urgut ursus urter urubu urutu usbeg usees users usest usses uster ustur usure usutu uter- utfse utfsf utter uttur utube uturu uuuuu

b-tree bbbbbb bbsers beebee beebes beebug beefer beegee beegfs beerse beerst beeste beeter beffes befree befret begess begets begger begtse begues berbee berber berbes bereet bereft berege berere berest berets berger berrer berres berret bersee berset bertes bertre bertus berube berust besbes besbre besege besert besets besser besses besset bessus bester besuge besure betere betete betrue bettee better bettes betutu beurre beuste brebes breefe breege breere breese breest breger bregge breres bresse breste brests brette bretts breuer breust brubru brufut bruges brugge