-er a-a a-b aaa aab aad aae aag aan aar aas ab- aba abb abd abe abg abn abr abs ad- ada adb add ade adg adn adr ads aea aeb aed aee aeg aen aer aes ag- aga agb agd age agg agn agr ags an- ana anb and ane ang ann anr ans ar- ara arb ard are arg arn arr ars as- asa asb asd ase asg asn asr ass baa bab bad bae bag ban bar bas bba bbb bbd bbe bbg bbn bbr bbs bda bdb bdd bde bdg bdr bds be- bea beb bed bee beg ben ber bes bga bgb bgd bge bgg bgn bgr bgs bna bnb bnd bne bng bnn bnr bns bra brb brd bre brg brn brr brs bsa bsb bsd bse bsg bsn bsr bss daa dab dad dae dag dan dar das dba dbb dbd dbe dbg dbn dbr dbs dda ddb ddd dde ddg ddn ddr dds de- dea deb ded dee deg den der des dga dgd dge dgg dgn dgr dgs dna dnb dnd dne dng dnn dnr dns dra drb drd dre drg drn drr drs dsa dsb dsd dse dsg dsn dsr dss eaa eab ead eae eag ean ear eas eba ebb ebd ebe ebg ebn ebr ebs ed- eda edb edd ede edg edn edr eds eea eeb eed eee eeg een eer ees ega egb egd ege egg egn egr egs en- ena enb end ene eng enn enr ens era erb erd ere erg ern err ers es- esa esb esd ese esg esn esr ess g-d gaa gab gad gae gag gan gar gas gba gbd gbe gbg gbn gbr gbs gda gdb gdd gde gdn gdr gds ge- gea geb ged gee geg gen ger ges gga ggb ggd ggg ggn ggr ggs gna gnb gnd gne gnn gnr gns gra grb grd gre grg grn grr grs gsa gsb gsd gse gsg gsn gsr gss naa nab nad nae nag nan nar nas nba nbb nbd nbe nbg nbn nbr nbs nda ndb ndd nde ndg ndn ndr nds ne- nea neb ned nee neg nen ner nes nga ngb ngd nge ngg ngn ngs nna nnb nne nng nnn nns nra nrb nrd nre nrg nrn nrr nrs nsa nsb nsd nse nsg nsn nsr nss ra- raa rab rad rae rag ran rar ras rba rbb rbd rbe rbg rbn rbr rbs rda rdb rdd rde rdg rdn rdr rds re- rea reb red ree reg ren rer res rga rgb rgd rge rgg rgn rgr rgs rna rnb rnd rng rnn rnr rns rra rrb rrd rrg rrn rrr rrs rsa rsb rsd rse rsg rsn rsr rss saa sab sad sae sag san sar sas sba sbb sbd sbe sbg sbn sbr sbs sda sdb sdd sde sdg sdn sdr sds se- sea seb sed see seg sen ser ses sga sgb sgd sge sgg sgn sgr sgs sna snb snd sne sng snn snr sns sr- sra srb srd sre srg srn srr srs ss- ssa ssb ssd sse ssg ssn ssr sss