-er b-p bbb bbc bbd bbe bbp bbr bbt bbx bcb bcc bcd bce bcp bcr bct bcx bdb bdc bdd bde bdp bdr bdt bdx be- beb bec bed bee bep ber bet bex bpb bpc bpd bpe bpp bpr bpt bpx brb brd bre brp brr brt brx btb btc btd bte btp btr btt btx bxb bxd bxx c-- cbb cbc cbd cbe cbp cbr cbt cbx ccb ccc ccd cce ccp ccr cct ccx cdb cdc cdd cde cdp cdr cdt cdx ce- ceb cec ced cee cep cer cet cex cpb cpc cpd cpe cpp cpr cpt cpx crb crc crd cre crp crr crt crx ctb ctc ctd cte ctp ctr ctt ctx cxc cxp cxr cxt cxx dbb dbc dbd dbe dbp dbr dbt dbx dcb dcc dcd dce dcp dcr dct dcx ddb ddc ddd dde ddp ddr ddt ddx de- deb dec ded dee dep der det dex dpb dpc dpd dpe dpp dpr dpt drb drc drd dre drp drr drt drx dtb dtc dtd dte dtp dtr dtt dtx dxc dxd dxp dxr dxt dxx ebb ebc ebd ebe ebp ebr ebt ebx ec- ecb ecc ecd ece ecr ect ecx ed- edb edc edd ede edp edr edt edx eeb eec eed eee eep eer eet eex ep- epb epc epd epe epp epr ept epx erb erc erd ere erp err ert etb etc etd ete etp etr ett etx ex- exc exd exe exp exr ext exx p-p pbb pbc pbd pbe pbp pbr pbt pbx pcb pcc pcd pce pcp pcr pct pcx pdb pdc pdd pde pdp pdr pdt pdx peb pec ped pee pep per pet pex ppb ppc ppd ppe ppp ppr ppt ppx prb prc prd pre prp prr prt prx pt- ptb ptc ptd pte ptp ptr ptt ptx pxc pxe pxr pxt rbb rbc rbd rbe rbp rbr rbt rbx rcb rcc rcd rce rcp rcr rct rcx rdb rdc rdd rde rdp rdr rdt rdx re- reb rec red ree rep rer ret rex rpb rpc rpd rpe rpp rpr rpt rpx rrb rrc rrd rrp rrr rrt rtb rtc rtd rte rtp rtr rtt rtx rxp rxr t-x tbb tbc tbd tbe tbp tbr tbt tcb tcc tcd tce tcp tcr tct tcx tdb tdc tdd tde tdp tdr tdt tdx te- teb tec ted tee tep ter tet tex tpb tpc tpd tpe tpp tpr tpt tpx trb trc trd tre trp trr trt trx ttb ttc ttd tte ttp ttr ttt ttx txe txt xbc xbe xbr xbx xcb xcd xcp xcr xcx xdb xdc xde xdr xdt xed xee xep xer xet xex xpb xpc xpd xpe xpp xpt xrc xrd xrt xrx xtc xtp xtr xtx xxp xxx

bbbb bbdd bbeb bbet bbpr bbrc bcbc bcbp bccc bcde bcec bcer bcet bcpp bctc bd-r bdbc bddc bdpc bebb bebe bede beeb beed beep beer beet berc berd bere berr bert betc bete bett bpcp bprc bprd brcb brce brdt breb brec bred bree brep brer bret brex brrr brtc btbp btcc btcx btdt btec btex btrc btrt bttb c-cd cbbc cbcc cbce cbcp cbcr cbct cbdb cbdc cbec cbee cber cbet cbpc cbpp cbrd cbre cbrt cbtc ccbc cccb cccc cccp ccdc ccdp ccdr cced ccee ccpe ccpp ccpr ccrc ccre ccrp ccrt cctb cctc cctt cd-e cd-r cddb cddr cdec cder cdex cdre cebp cec- cece cecp cect cedd cede cedt ceeb ceec cepc cepe cepp cepr cept cer- cerc cerd cere cerp cert cet- cete cetp cexe cpbc cpce cpeb cpep cper cppd cpre cprt cptp cptr crbc crcc crce crcr crdc cre- creb crec cred cree crep cret crex crpc crrt crtc crtp ctcp ctec ctep ctpp ctrc ctrp cxxx dbcc dbcp dbpc dbpd dbtt dcbc dccb dccc dccp dcct dcdb dctc dcxx dddd ddrc ddre debe debt dec- decc decd dece dect dedd dede deeb deed deep deer deet depc depe depp depr dept der- derb derc dere derp derr dete detr dex- dexe dext dpbc dpcp dpdt dper dppc dppx drbc dred dree dret dtcc dtdp dted dttp dttx dtxt dxbc dxbe dxbr dxbt dxcb dxcc dxdc dxdr dxec dxed dxep dxrd dxre dxrp dxrr dxrt dxrx dxxr dxxx ebbc ebbr ebcc ebed eber ecbc ecbe eccb eccc ecce ecct ecdc eced ecpd ecpp ecrc ecrr ect- ectc eddc edde eddp ede- eder edex eede eeee eerc eetc eete eext epcc epec epee eper eppc eppp eprb eprp epte epxp er-x erbb erbe ercc erce ercp erde ereb erec ered erer eret erpe errc erre etbc etbr etcc etec etee eter etre ette exec exed exer expr expt exrx exte extr pbcc pbed pcbc pccc pcce pcep pcer pcpb pcpp pcrc pcrd pcre pcte pdcp pdpr pdrc pdtc pece pecr pect ped- pede peec peed peep peer peet pepd pepe per- perc perd pere perp perr pert pete petr pett ppcc ppcd pper pppd pppp pprc pptt prbc prcc prcd prcp pre- preb prec pred pree prep pret prex prpd prrd prtc prtp prtr ptcc ptdc pter ptpd ptrd pttc rbbb rbbr rcbc rccb rccc rcdc rcde rcep rcet rcpd rcpt rcrd rctc rdbp rder rdpc rebb rebe recc recd rece recp recr rect redc redd rede redr redx reeb reed reep reet repe repp repr rept rerd rere rert retd rete retr rett rexx rpdp rpet rptd rred rrrr rtcc rtce rtdt rtee rtex rttp tbcb tbcc tbcd tbce tbrb tbtp tccc tcdd tcep tctc tddb tecr tect tedd tede tedx teec teed teer teet tepe tepp ter- terc tere terp terr tete tetr tett tetx text tpcd tpcp tped tper tppd tppp tppr tpte tptp tptr trcc tre- trec tred tree tret trex trpc trpe trpp trtc trte trtr ttbb ttcp tter tttt txtr x-ed xbcd xbee xdcc xeer xer- xert xexe xpcc xper xrcd xrdb xrep xtep xxxx

-tree b-e-d bbbee bcced bd-re be-er bebed beber bedde bedee beder bedet beebe beede beerd beete beppe