-er bbb bbe bbg bbi bbr bbt bbx be- beb bee beg bei ber bet bex bgb bge bgg bgi bgr bgt bgx bi- bib bie big bii bir bit bix brb bre brg bri brr brt brx btb bte btg bti btr btt btx bxb bxi bxx ebb ebe ebg ebi ebr ebt ebx eeb eee eeg eer eet eex egb ege egg egi egr egt egx eib eie eig eii eir eit eix erb ere erg eri err ert etb ete etg eti etr ett etx ex- exe exi exr ext exx gbe gbg gbi gbr gbt gbx ge- geb gee geg gei ger get gex ggb ggg ggi ggr ggt gib gie gig gii gir git grb gre grg gri grr grt grx gtb gte gtg gti gtr gtt gtx gxt ibb ibe ibg ibi ibr ibt ibx ie- iee ieg iei ier iet iex igb ige igg igi igr igt iib iie iii iir iit iix ir- irb ire irg iri irr irt irx itb ite itg iti itt itx ixe ixi rbb rbe rbg rbi rbr rbt rbx re- reb ree reg rei rer ret rex rgb rge rgg rgi rgr rgt rgx rib rie rig rii rir rit rix rrb rrg rri rrr rrt rtb rte rtg rti rtr rtt rtx rxr t-x tbb tbe tbg tbi tbr tbt te- teb tee teg tei ter tet tex tgb tge tgg tgi tgr tgt tib tie tig tii tir tit tix trb tre trg tri trr trt trx ttb tte ttg tti ttr ttt ttx txe txi txt xbe xbr xbx xee xeg xer xet xex xge xgi xie xii xit xix xrt xrx xti xtr xtx xxi xxx

bbbb bbeb bbet bbrg bebb bebe bebi beeb beeg beer beet begg begi beir beit bere berg beri berr bert bete beti bett bibb bibe bibi bieb bier biet bigb bige bigg bigt birb bire birg biri birr birt birx bite bitt bitx bixi breb bree breg brei brer bret brex brie brig brit brix brrr btex btie btrt bttb ebbr eber ebit ebix eeee eerg eete eext egbe egee eger eggb egge eggi egir egre egri egte eiei eier eige eigg eire eitb eiti eitr er-x erbb erbe ereb erei erer eret erg- ergg ergi erie erit erre etbr etee eter etix etre ette etti exer exge exgi exit exrx exte extr gebe gebi geer geet gege gegg geie geig geir geit gerb gere geri gert getb gete getg geti gett ggbt gggg gibb gibe gier giet gige gigg gigi gire girg giri girr girt gite grbr greb gree greg gret grex grib grie grig grit grrr gtbr i-be ibeg ibet ibex ibge ibie ibri ibtb ieet ieie iere ieri iett iger iget igri iiie iiii iiit iitr iitt irbe iree irer irex iri- irie irig irix irre irri irte irti itbe iter itet itex itie itri ixxi rbbb rbbr rebb rebe reeb reet rege regi regr regt reii reir reit rere rerg reri rert rete reti retr rett rexx rgbe rgbi rgit rgtr rib- ribe rier riet riex rige rigg rigi rire riri rite riti ritt rixe rrrr rtee rtei rtex tbit tbrb teer teet tegg tegi tegt teie teir ter- tere teri terr tete teti tetr tett tetx text tibi tie- tiee tiei tier tiet tige tigi tigr tiit tirb tire tiri tirr tite titi titt tixt tre- tree treg trei tret trex trge tri- trib trie trig trit trix trte trtr ttbb tter tttt txii txtr xbee xeer xer- xert xexe xggi xibe xiii xixi xtie xxii xxix xxxi xxxx

-tree bbbee be-er beber bebti beebe beeri beete begee beget begge begti beibi beier beige beire beite berbe bereg berei beret berge bergi berie berig berit berre berri berte berti betee beter betie betre bett- bette betti betxi bibbe biber bibie bibri biebe biere bieri biert bieti big-i bigge bigig birgi birie biter bitit bitte bitti bixie bre-x breer breet breg- brege bregg breit brere brett bretx bribe brieg brier brige brigg brigi brite britt brixx brrrr btr-t ebber ebbet ebbie eberg ebert ebibe eeeee eerie eetti egger eggie eggig egret eiger eirie eiter eitri erbbe erber erege erere erier erite erixx erte erter etete etext etite etree etter ettie exbi- exert exigi exite exter extre gberg gbiti geber gebet gebre geere geert geete gegge geier geige geire geite geitt gerbe gerbi gerre gerri gertt getee geter getit gette getti gibbe gibbi giber gibi- giger gigge girei gitex gitie gitig gitit grebe greer greet grege gregg greig greit grete grett grieg grier griet grigg grite grrrr i-bet iberg ibert ibeti iebet ieiri ierei iette iggri igigi iiiee iiiii iitti irbit iregi irete irite irreg irrit itbig itbit itete itext itget itigi itire itter ittre ittti rebbe rebeg reber rebet rebit reege reere reeti reger reget regex regge regie regii regtt reigi rere- reree reret rerig rerir retee reter retex retie retrg rette rexer ribbi riber ribet ribie ribxi rieti rig-i riget ririe rtext t-rex tbeti tbtbt teber tebet tebi- teege tegbi teggi tegir tegre teige teret terex terge terre terri tert- teter tetex tetr- tetri tette texte ti-ti tibbi tiber tibet tieit tiere tieri tiexi tiger tigit tigre tigri tiigi tiree tirer tiret tirig tirit titer titig titii titre titte titti tixte treer treet treg- treib treie treit treix trere treri trete trett tribe trieb triei trier triet trige trigg trit- trite tritt ttttt xbxrx xerte xetex xexex xiber xireg xtext xtree xxiii xxxii xxxix

b-tree bbbbbb bebite beebee beegee beeter begbie begger begirt beiber beiger berbee berber bereet berege berere berger bergie berrer berret berrie bertie bertre betere betete betire bettee better bettie bexter bibber biberg bibiri bibtex bieber bierge bigbee bigbet bigger biggie biggit bigrig birger birgit birgte biribi biteit bitext bitier bitrig bitter bittie bixter breege breere breger bregge breite brette brexit bribe- bribee briber bribir bribri brigge brigit e-text ebbert ebr-ii ebrie eebree eerier egbere egbert egerie eggert eggier eibert eirigi erbree erebti errett etgert etiger exeter exibit