-er a-a a-b aaa aab aad aae aag aak aan aar aas ab- aba abb abd abe abg abk abn abr abs ad- ada adb add ade adg adk adn adr ads aea aeb aed aee aeg aek aen aer aes ag- aga agb agd age agg agk agn agr ags aka akb akd ake akg akk akn akr aks an- ana anb and ane ang ank ann anr ans ar- ara arb ard are arg ark arn arr ars as- asa asb asd ase asg ask asn asr ass baa bab bad bae bag bak ban bar bas bba bbb bbd bbe bbg bbk bbn bbr bbs bda bdb bdd bde bdg bdk bdr bds be- bea beb bed bee beg bek ben ber bes bga bgb bgd bge bgg bgk bgn bgr bgs bka bkb bke bkg bkk bkn bkr bks bna bnb bnd bne bng bnk bnn bnr bns bra brb brd bre brg brk brn brr brs bsa bsb bsd bse bsg bsk bsn bsr bss daa dab dad dae dag dak dan dar das dba dbb dbd dbe dbg dbk dbn dbr dbs dda ddb ddd dde ddg ddk ddn ddr dds de- dea deb ded dee deg dek den der des dga dgd dge dgg dgk dgn dgr dgs dka dkb dke dkg dkk dkr dks dna dnb dnd dne dng dnk dnn dnr dns dra drb drd dre drg drk drn drr drs dsa dsb dsd dse dsg dsk dsn dsr dss eaa eab ead eae eag eak ean ear eas eba ebb ebd ebe ebg ebk ebn ebr ebs ed- eda edb edd ede edg edk edn edr eds eea eeb eed eee eeg eek een eer ees ega egb egd ege egg egn egr egs eka ekb ekd eke ekg ekr eks en- ena enb end ene eng enk enn enr ens era erb erd ere erg erk ern err ers es- esa esb esd ese esg esk esn esr ess g-d gaa gab gad gae gag gak gan gar gas gba gbd gbe gbg gbk gbn gbr gbs gda gdb gdd gde gdk gdn gdr gds ge- gea geb ged gee geg gek gen ger ges gga ggb ggd ggg ggn ggr ggs gka gkb gkd gkn gks gna gnb gnd gne gnn gnr gns gra grb grd gre grg grk grn grr grs gsa gsb gsd gse gsg gsk gsn gsr gss ka- kaa kab kad kae kag kak kan kar kas kba kbb kbd kbe kbk kbn kbr kbs kda kdb kde kdg kdk kdr kds ke- kea keb ked kee keg kek ken ker kes kga kgb kgd kgs kkb kke kkk kkn kkr kks kn- kna knd kne kng knk knn knr kra krd krg krk krn krr krs ksa ksb ksd kse ksg ksk ksn ksr kss naa nab nad nae nag nak nan nar nas nba nbb nbd nbe nbg nbk nbn nbr nbs nda ndb ndd nde ndg ndk ndn ndr nds ne- nea neb ned nee neg nek nen ner nes nga ngb ngd nge ngg ngk ngn ngs nka nke nkk nkn nkr nks nna nnb nne nng nnk nnn nns nra nrb nrd nre nrg nrk nrn nrr nrs nsa nsb nsd nse nsg nsk nsn nsr nss ra- raa rab rad rae rag rak ran rar ras rba rbb rbd rbe rbg rbk rbn rbr rbs rda rdb rdd rde rdg rdn rdr rds re- rea reb red ree reg rek ren rer res rga rgb rgd rge rgg rgk rgn rgr rgs rkb rke rkg rkk rks rna rnb rnd rng rnn rnr rns rra rrb rrd rrg rrk rrn rrr rrs rsa rsb rsd rse rsg rsk rsn rsr rss saa sab sad sae sag sak san sar sas sba sbb sbd sbe sbg sbk sbn sbr sbs sda sdb sdd sde sdg sdk sdn sdr sds se- sea seb sed see seg sek sen ser ses sga sgb sgd sge sgg sgk sgn sgr sgs sk- ska skb skd ske skg skk skr sks sna snb snd sne sng snk snn snr sns sr- sra srb srd sre srg srk srn srr srs ss- ssa ssb ssd sse ssg ssk ssn ssr sss