-er a-a a-b a-t aaa aab aad aae aan aar aas aat ab- aba abb abd abe abn abr abs abt ad- ada adb add ade adn adr ads adt aea aeb aed aee aen aer aes aet an- ana anb and ane ann anr ans ant ar- ara arb ard are arn arr ars art as- asa asb asd ase asn asr ass ast at- ata atb atd ate atn atr ats att baa bab bad bae ban bar bas bat bba bbb bbd bbe bbn bbr bbs bbt bda bdb bdd bde bdr bds bdt be- bea beb bed bee ben ber bes bet bna bnb bnd bne bnn bnr bns bnt bra brb brd bre brn brr brs brt bsa bsb bsd bse bsn bsr bss bst bta btb btd bte btn btr bts btt daa dab dad dae dan dar das dat dba dbb dbd dbe dbn dbr dbs dbt dda ddb ddd dde ddn ddr dds ddt de- dea deb ded dee den der des det dna dnb dnd dne dnn dnr dns dnt dra drb drd dre drn drr drs drt dsa dsb dsd dse dsn dsr dss dst dta dtb dtd dte dtn dtr dts dtt eaa eab ead eae ean ear eas eat eba ebb ebd ebe ebn ebr ebs ebt ed- eda edb edd ede edn edr eds edt eea eeb eed eee een eer ees eet en- ena enb end ene enn enr ens ent era erb erd ere ern err ers ert es- esa esb esd ese esn esr ess est eta etb etd ete etn etr ets ett naa nab nad nae nan nar nas nat nba nbb nbd nbe nbn nbr nbs nbt nda ndb ndd nde ndn ndr nds ndt ne- nea neb ned nee nen ner nes net nna nnb nne nnn nns nnt nra nrb nrd nre nrn nrr nrs nrt nsa nsb nsd nse nsn nsr nss nst nta ntb ntd nte ntn ntr nts ntt ra- raa rab rad rae ran rar ras rat rba rbb rbd rbe rbn rbr rbs rbt rda rdb rdd rde rdn rdr rds rdt re- rea reb red ree ren rer res ret rna rnb rnd rnn rnr rns rnt rra rrb rrd rrn rrr rrs rrt rsa rsb rsd rse rsn rsr rss rst rta rtb rtd rte rtn rtr rts rtt saa sab sad sae san sar sas sat sba sbb sbd sbe sbn sbr sbs sbt sda sdb sdd sde sdn sdr sds sdt se- sea seb sed see sen ser ses set sna snb snd sne snn snr sns snt sr- sra srb srd sre srn srr srs srt ss- ssa ssb ssd sse ssn ssr sss sst sta stb std ste stn str sts stt taa tab tad tae tan tar tas tat tba tbb tbd tbe tbn tbr tbs tbt tda tdb tdd tde tdn tdr tds tdt te- tea teb ted tee ten ter tes tet tna tnb tnd tne tnn tnr tns tnt tra trb trd tre trn trr trs trt tsa tsb tsd tse tsn tsr tss tst tta ttb ttd tte ttn ttr tts ttt