-er -th bbb bbe bbh bbi bbr bbt bbx be- beb bee beh bei ber bet bex bhb bhe bhh bhi bhr bht bhx bi- bib bie bih bii bir bit bix brb bre brh bri brr brt brx btb bte bth bti btr btt btx bxb bxi bxx ebb ebe ebh ebi ebr ebt ebx eeb eee eer eet eex ehb ehe ehh ehi ehr eht eib eie eii eir eit eix erb ere erh eri err ert etb ete eth eti etr ett etx ex- exe exh exi exr ext exx h-i hbb hbe hbh hbi hbr hbt hbx he- heb hee heh hei her het hex hhb hhe hhh hhi hhr hht hib hie hih hii hir hit hix hr- hrb hre hrh hri hrr hrt htb hte hth hti htr htt htx ibb ibe ibh ibi ibr ibt ibx ie- iee iei ier iet iex ihb ihe ihh ihi ihr iht iib iie iih iii iir iit iix ir- irb ire iri irr irt irx itb ite ith iti itt itx ixe ixi rbb rbe rbh rbi rbr rbt rbx re- reb ree reh rei rer ret rex rh- rhb rhe rhh rhi rhr rht rib rie rih rii rir rit rix rrb rrh rri rrr rrt rtb rte rti rtr rtt rtx rxr t-x tbb tbe tbh tbi tbr tbt te- teb tee teh tei ter tet tex th- thb the thh thi thr tht thx tib tie tih tii tir tit tix trb tre trh tri trr trt trx ttb tte tth tti ttr ttt ttx txe txi txt xbe xbr xbx xee xer xet xex xht xie xii xit xix xrt xrx xti xtr xtx xxi xxx

bbbb bbeb bbet bebb bebe bebi beeb beer beet behr beir beit bere beri berr bert bete beth beti bett bher bhet bhie bhir bhit bhrt bibb bibe bibi bieb bier biet bihe bihi birb bire biri birr birt birx bite bith bitt bitx bixi breb bree brei brer bret brex brie brih brit brix brrr btex btie btrt bttb ebbr eber ebit ebix eeee eete eeth eext eheh eher ehre ehte eiei eier eire eitb eith eiti eitr er-x erbb erbe ereb erei erer eret erie erih erit erre erth etbr etee eter eth- ethe etix etre ette etti exer exh- exhi exit exrx exte extr h-ii hbit hebb hebe hebi hebr heeb heer heet hehe heie heih heir heit herb here heri herr hert hete heth hett hex- hexb hexe hexi hext hhex hhhh hibi hibt hiei hier hiet hihe hihi hiht hiie hiit hire hiri hirt hite hiti hitt hree hrib hrit hrtb hrte htet httr i-be ibeh ibet ibex ibie ibri ibtb ieet ieie iere ieri iett iher ihit ihre iiht iiie iiii iiit iitr iitt irbe iree irer irex iri- irie irix irre irri irte irti itbe iter itet itex ithe itie itri ixxi rbbb rbbr rebb rebe reeb reet rehb rehe rehi reht reii reir reit rere reri rert rete reth reti retr rett rexx rheb rhee rhet rhex rhib rib- ribe rier riet riex riht rire riri rite rith riti ritt rixe rrrr rtee rtei rtex tbit tbrb teer teet tehi tehr teie teir ter- tere teri terr tete teth teti tetr tett tetx text the- theb thee thei ther thet thex thi- thie thir thre thri thtb thtr tibi tie- tiee tiei tier tiet tiht tiit tirb tire tiri tirr tite tith titi titt tixt tre- tree trei tret trex tri- trib trie trit trix trte trtr ttbb tter tttt txii txtr xbee xeer xer- xert xexe xhri xibe xihe xiii xixi xtie xxii xxix xxxi xxxx

-tree bbbee be-er beber bebti beebe beeri beete beeth beher behet behie behir beibi beier beihe beire beite beith berbe bereh berei beret berhe berie berit berre berri berte berth berti betee beter bethe betie betre bett- bette betti betxi bheer bheri bibbe biber bibie bibri biebe biere bieri biert bieti biher birie birth biter bitit bitte bitti bixie bre-x breer breet breit brere breth brett bretx bribe brier brite brith britt brixx brrrr btr-t ebber ebbet ebbie ebert ebibe eeeee eerie eetti ehire ehret eirie eiter eithe eitri erbbe erber erere erier erite erith erixx erte erter erthe etete etext ether etite etree etter ettie exbi- exert exhex exite exter extre h-e-b h-iib he-he hebbe hebe- hebei heber hebri heeii heere heete hehte heihe heire heith heiti heixt herei herie herit herre herte herth herti heter hethe hette hexer hexie hexit hheth hhhhh hi-ex hi-hi hibhi hibit hibri hier- hiree hirer hirth hithe hitit hitte hrere hthrt htree i-bet ibert ibeti iebet ieiri ierei iethe iette iherb ihere ihite iiiee iiiii iitti irbit irete irite irrit itbit itete itext ithee ither itire itter itthe ittre ittti rebbe reber rebet rebit reere reerh reeth reeti reher rehet rehit rehri rehti reith rere- reree reret rerir retee reter retex rethe retie rette rexer rhett ribbi riber ribet ribie ribxi rieth rieti rihte ririe rithe rithi rtext t-rex tbeti tbtbt teber tebet tebi- teeth tehee tehri teret terex terre terri tert- teter tetex tethe tetr- tetri tette texte thebe theeb theei theer theex theie their theit theix ther- there theri thete theth thexx thibi thier thire thiri thite thre- three thret thrie thrix ti-he ti-hi ti-ti tibbi tiber tibet tieit tiere tieri tieth tiexi tiree tireh tirer tiret tirit tirth titer tithe tithi titii titre titte titti tixte treer treet treib treie treit treix trere treri trete trett tribe trieb triei trier triet trit- trite tritt ttttt xbxrx xerte xetex xexex xheet xiber xtext xtree xxiii xxxii xxxix

b-tree bbbbbb bebite beebee beeter behete behite behter beiber berbee berber bereet berere berhet berith berrer berret berrie berthe bertie bertre betere betete betire bettee better bettie bexter bibber bibiri bibtex bieber biheet biribi birthe biteit bitext bitier bitter bittie bixter breere breeth breite brethe brette brexit bribe- bribee briber bribir bribri bthree e-text ebbert ebbeth ebr-ii ebrie eebree eerier eibert either erbree erebti erreth