-er bbb bbd bbe bbf bbr bbs bbt bbx bdb bdd bde bdf bdr bds bdt bdx be- beb bed bee bef ber bes bet bex bfb bfd bfe bff bfr bfs bft bfx brb brd bre brf brr brs brt brx bsb bsd bse bsf bsr bss bst bsx btb btd bte btf btr bts btt btx bxb bxd bxx dbb dbd dbe dbf dbr dbs dbt dbx ddb ddd dde ddf ddr dds ddt ddx de- deb ded dee def der des det dex dfb dfd dfe dff dfr dfs dft dfx drb drd dre drr drs drt drx dsb dsd dse dsf dsr dss dst dsx dtb dtd dte dtf dtr dts dtt dtx dxd dxr dxs dxt dxx ebb ebd ebe ebf ebr ebs ebt ebx ed- edb edd ede edf edr eds edt edx eeb eed eee eef eer ees eet eex ef- efb efd efe eff efr efs eft efx erb erd ere erf err ers ert es- esb esd ese esf esr ess est esx etb etd ete etf etr ets ett etx ex- exd exe exr exs ext exx fbb fbd fbe fbf fbr fbs fbt fbx fdb fdd fde fdf fdr fds fdt fdx feb fed fee fef fer fes fet fex ffd ffe fff ffr ffs fft ffx frb frd fre frf frr frs frt fsb fsd fse fsf fsr fss fst fsx ftb ftd fte ftf ftr fts ftt ftx fxe fxr fxs fxt fxx rbb rbd rbe rbf rbr rbs rbt rbx rdb rdd rde rdf rdr rds rdt rdx re- reb red ree ref rer res ret rex rfb rfd rfe rff rfr rfs rft rrb rrd rrf rrr rrs rrt rsb rsd rse rsf rsr rss rst rsx rtb rtd rte rtf rtr rts rtt rtx rxr rxs sbb sbd sbe sbf sbr sbs sbt sbx sdb sdd sde sdf sdr sds sdt se- seb sed see sef ser ses set sex sfb sfd sfe sff sfr sfs sft sfx sr- srb srd sre srf srr srs srt srx ss- ssb ssd sse ssf ssr sss sst ssx stb std ste stf str sts stt stx sxs sxt t-x tbb tbd tbe tbf tbr tbs tbt tdb tdd tde tdf tdr tds tdt tdx te- teb ted tee tef ter tes tet tex tfb tfd tfe tff tfr tfs tft tfx trb trd tre trf trr trs trt trx tsb tsd tse tsf tsr tss tst tsx ttb ttd tte ttf ttr tts ttt ttx txe txf txs txt xbe xbr xbx xdb xde xdf xdr xds xdt xed xee xer xes xet xex xfe xfs xft xfx xrd xrf xrt xrx xsb xss xst xtf xtr xts xtx xxx

bbbb bbbs bbdd bbeb bbet bd-r bdes bdsd bebb bebe bede beds beeb beed beef beer bees beet befe beff beft berd bere berr bers bert bes- bese bess best bete bets bett bffs bfsr bfts bftt brds brdt breb bred bree bref brer bres bret brex brrr brrs brsb brsr brst bsbd bseb bsed bsee bser bses bset bsff bsfs bsrd bssd bsse bsts btdt btex btrt btss bttb dbfs dbfx dbrs dbss dbtt dddd ddes ddre ddss ddts debe debs debt dedd dede deeb deed deef deer dees deet defe deff defs deft der- derb dere derf derr ders des- dese dess dest dete detr dets dex- dexe dext dfds dfdt dfer dfrf dftr dfts dred dree dref dres dret drrs dsdr dsrr dsst dsts dted dtss dttx dtxt dxbe dxbr dxbt dxdr dxds dxed dxef dxes dxfe dxfx dxrd dxre dxrf dxrr dxrt dxrx dxss dxts dxxr dxxx ebbr ebbs ebed eber ebes edde edds ede- eder edes edex edss edts eede eeee eees eefe eers eese eete eets eext efbr efes efet effs eft- efts er-x erbb erbe erde erdf erds ereb ered erer eres eret erfs erft erfx erre errs erse erst erts esbs esds esdx esee eser eses eset esfs esrd esse esst estd este estr ests etbr etds etee eter etes etfb etfe etre ette exed exer exes exrx exte extr exts fbrs fbsd fdst febs fede feds feeb feed feer fees feet fefe feff ferb ferd fere ferr fers fert fese fess fest fete fetr fets fett fext ffee ffff ffrr ffss fftf fred free fres fret frex frsb frst fssf fter ftrs ftse ftsr fxdd rbbb rbbr rbbs rbds rbsd rbss rbst rder rebb rebe rebs redd rede redr reds redx reeb reed reef rees reet refd refe reff refr refs reft rerd rere rers rert rese ress rest retd rete retr rets rett rexx rfds rfef rred rrrr rsdd rsds rsee rsre rsts rtbf rtdt rtee rtes rtex rtfb rtss rtts rxes sbbs sbds sbef sber sbsd sbse sbst sdds sdef sder sdes sdet sdrs sdsf sdss sdxf se-d se-e se-f se-s se-t se-x sebe sebs sebt sede seds seeb seed seef seer sees seet seex seff seft serb serd sere serf serr sers sert sese sess sest set- sete setf sets sett setx sex- sexe sext sfer sfss sfts srde sreb sres srsd srtr ssbr ssdd ssdf ssee sses sset ssex ssrs sssb sssf ssss sstb sstd ssts stbd stbs stds sted stee stef ster stes stet stex strd stre strs stsf stss sttd sttr sxde tbbs tbrb tbst tddb tdes tdff tdse tdss tedd tede teds tedx teed teef teer tees teet teff teft ter- tere terf terr ters tesd tese tess test tete tetr tets tett tetx text tfeb tfrs tfsd tfss tre- tred tree tref tres tret trex trfd trfr trsd trst trte trtr tsbd tsdb tses tset tsse tssf tssr tsst tsts ttbb tter ttff ttss tttt txtr x-ed xbee xdxf xeer xefe xer- xers xert xexe xfer xrdb xrds xtbs xtsr xxxx

-tree b-e-d bbbee bbser bd-re bdser be-er bebed beber bebes bedde bedee beder bedes bedet bedse beebe beebs beede beefs beeft beerd beers beesd beest beete beets beffe berbe berde bered beres beret berre berse berte berts besed