-er a-a a-b a-t aaa aab aad aae aag aar aas aat ab- aba abb abd abe abg abr abs abt ad- ada adb add ade adg adr ads adt aea aeb aed aee aeg aer aes aet ag- aga agb agd age agg agr ags agt ar- ara arb ard are arg arr ars art as- asa asb asd ase asg asr ass ast at- ata atb atd ate atg atr ats att baa bab bad bae bag bar bas bat bba bbb bbd bbe bbg bbr bbs bbt bda bdb bdd bde bdg bdr bds bdt be- bea beb bed bee beg ber bes bet bga bgb bgd bge bgg bgr bgs bgt bra brb brd bre brg brr brs brt bsa bsb bsd bse bsg bsr bss bst bta btb btd bte btg btr bts btt daa dab dad dae dag dar das dat dba dbb dbd dbe dbg dbr dbs dbt dda ddb ddd dde ddg ddr dds ddt de- dea deb ded dee deg der des det dga dgd dge dgg dgr dgs dgt dra drb drd dre drg drr drs drt dsa dsb dsd dse dsg dsr dss dst dta dtb dtd dte dtg dtr dts dtt eaa eab ead eae eag ear eas eat eba ebb ebd ebe ebg ebr ebs ebt ed- eda edb edd ede edg edr eds edt eea eeb eed eee eeg eer ees eet ega egb egd ege egg egr egs egt era erb erd ere erg err ers ert es- esa esb esd ese esg esr ess est eta etb etd ete etg etr ets ett g-d gaa gab gad gae gag gar gas gat gba gbd gbe gbg gbr gbs gbt gda gdb gdd gde gdr gds gdt ge- gea geb ged gee geg ger ges get gga ggb ggd ggg ggr ggs ggt gra grb grd gre grg grr grs grt gsa gsb gsd gse gsg gsr gss gst gta gtb gtd gte gtg gtr gts gtt ra- raa rab rad rae rag rar ras rat rba rbb rbd rbe rbg rbr rbs rbt rda rdb rdd rde rdg rdr rds rdt re- rea reb red ree reg rer res ret rga rgb rgd rge rgg rgr rgs rgt rra rrb rrd rrg rrr rrs rrt rsa rsb rsd rse rsg rsr rss rst rta rtb rtd rte rtg rtr rts rtt saa sab sad sae sag sar sas sat sba sbb sbd sbe sbg sbr sbs sbt sda sdb sdd sde sdg sdr sds sdt se- sea seb sed see seg ser ses set sga sgb sgd sge sgg sgr sgs sgt sr- sra srb srd sre srg srr srs srt ss- ssa ssb ssd sse ssg ssr sss sst sta stb std ste stg str sts stt taa tab tad tae tag tar tas tat tba tbb tbd tbe tbg tbr tbs tbt tda tdb tdd tde tdg tdr tds tdt te- tea teb ted tee teg ter tes tet tga tgb tge tgg tgr tgs tgt tra trb trd tre trg trr trs trt tsa tsb tsd tse tsg tsr tss tst tta ttb ttd tte ttg ttr tts ttt