-er a-a a-b aaa aab aad aae aag aar aas ab- aba abb abd abe abg abr abs ad- ada adb add ade adg adr ads aea aeb aed aee aeg aer aes ag- aga agb agd age agg agr ags ar- ara arb ard are arg arr ars as- asa asb asd ase asg asr ass baa bab bad bae bag bar bas bba bbb bbd bbe bbg bbr bbs bda bdb bdd bde bdg bdr bds be- bea beb bed bee beg ber bes bga bgb bgd bge bgg bgr bgs bra brb brd bre brg brr brs bsa bsb bsd bse bsg bsr bss daa dab dad dae dag dar das dba dbb dbd dbe dbg dbr dbs dda ddb ddd dde ddg ddr dds de- dea deb ded dee deg der des dga dgd dge dgg dgr dgs dra drb drd dre drg drr drs dsa dsb dsd dse dsg dsr dss eaa eab ead eae eag ear eas eba ebb ebd ebe ebg ebr ebs ed- eda edb edd ede edg edr eds eea eeb eed eee eeg eer ees ega egb egd ege egg egr egs era erb erd ere erg err ers es- esa esb esd ese esg esr ess g-d gaa gab gad gae gag gar gas gba gbd gbe gbg gbr gbs gda gdb gdd gde gdr gds ge- gea geb ged gee geg ger ges gga ggb ggd ggg ggr ggs gra grb grd gre grg grr grs gsa gsb gsd gse gsg gsr gss ra- raa rab rad rae rag rar ras rba rbb rbd rbe rbg rbr rbs rda rdb rdd rde rdg rdr rds re- rea reb red ree reg rer res rga rgb rgd rge rgg rgr rgs rra rrb rrd rrg rrr rrs rsa rsb rsd rse rsg rsr rss saa sab sad sae sag sar sas sba sbb sbd sbe sbg sbr sbs sda sdb sdd sde sdg sdr sds se- sea seb sed see seg ser ses sga sgb sgd sge sgg sgr sgs sr- sra srb srd sre srg srr srs ss- ssa ssb ssd sse ssg ssr sss