-er a-a a-b a-t aaa aab aad aae aag aao aar aas aat ab- aba abb abd abe abg abo abr abs abt ad- ada adb add ade adg ado adr ads adt aea aeb aed aee aeg aeo aer aes aet ag- aga agb agd age agg ago agr ags agt aoa aob aod aoe aog aoo aor aos aot ar- ara arb ard are arg aro arr ars art as- asa asb asd ase asg aso asr ass ast at- ata atb atd ate atg ato atr ats att baa bab bad bae bag bao bar bas bat bba bbb bbd bbe bbg bbo bbr bbs bbt bda bdb bdd bde bdg bdo bdr bds bdt be- bea beb bed bee beg beo ber bes bet bga bgb bgd bge bgg bgo bgr bgs bgt boa bob bod boe bog boo bor bos bot bra brb brd bre brg bro brr brs brt bsa bsb bsd bse bsg bso bsr bss bst bta btb btd bte btg bto btr bts btt daa dab dad dae dag dao dar das dat dba dbb dbd dbe dbg dbo dbr dbs dbt dda ddb ddd dde ddg ddo ddr dds ddt de- dea deb ded dee deg deo der des det dga dgd dge dgg dgr dgs dgt doa dob dod doe dog doo dor dos dot dra drb drd dre drg dro drr drs drt dsa dsb dsd dse dsg dso dsr dss dst dta dtb dtd dte dtg dto dtr dts dtt eaa eab ead eae eag eao ear eas eat eba ebb ebd ebe ebg ebo ebr ebs ebt ed- eda edb edd ede edg edo edr eds edt eea eeb eed eee eeg eeo eer ees eet ega egb egd ege egg ego egr egs egt eo- eoa eob eod eoe eog eoo eor eos eot era erb erd ere erg ero err ers ert es- esa esb esd ese esg eso esr ess est eta etb etd ete etg eto etr ets ett g-d gaa gab gad gae gag gao gar gas gat gba gbd gbe gbg gbo gbr gbs gbt gda gdb gdd gde gdo gdr gds gdt ge- gea geb ged gee geg geo ger ges get gga ggb ggd ggg ggo ggr ggs ggt goa gob god goe gog goo gor gos got gra grb grd gre grg gro grr grs grt gsa gsb gsd gse gsg gso gsr gss gst gta gtb gtd gte gtg gto gtr gts gtt oaa oab oad oae oag oao oar oas oat ob- oba obb obd obe obg obo obr obs obt oda odb odd ode odg odo odr ods odt oea oeb oed oee oeg oeo oer oes oet oga ogd oge ogg ogo ogs ogt oo- ooa oob ood oog ooo oor oos oot or- ora orb ord ore org oro orr ors ort os- osa osb osd ose osg oso osr oss ost ot- ota otb otd ote otg oto otr ots ott ra- raa rab rad rae rag rao rar ras rat rba rbb rbd rbe rbg rbo rbr rbs rbt rda rdb rdd rde rdg rdo rdr rds rdt re- rea reb red ree reg reo rer res ret rga rgb rgd rge rgg rgo rgr rgs rgt roa rob rod roe rog roo ror ros rot rra rrb rrd rrg rrr rrs rrt rsa rsb rsd rse rsg rso rsr rss rst rta rtb rtd rte rtg rto rtr rts rtt saa sab sad sae sag sao sar sas sat sba sbb sbd sbe sbg sbo sbr sbs sbt sda sdb sdd sde sdg sdo sdr sds sdt se- sea seb sed see seg seo ser ses set sga sgb sgd sge sgg sgo sgr sgs sgt soa sob sod soe sog soo sor sos sot sr- sra srb srd sre srg sro srr srs srt ss- ssa ssb ssd sse ssg sso ssr sss sst sta stb std ste stg sto str sts stt taa tab tad tae tag tao tar tas tat tba tbb tbd tbe tbg tbo tbr tbs tbt tda tdb tdd tde tdg tdo tdr tds tdt te- tea teb ted tee teg teo ter tes tet tga tgb tge tgg tgo tgr tgs tgt to- toa tob tod toe tog too tor tos tot tra trb trd tre trg tro trr trs trt tsa tsb tsd tse tsg tso tsr tss tst tta ttb ttd tte ttg tto ttr tts ttt