-er a-a a-b a-i a-t aaa aab aad aae aai aan aar aas aat ab- aba abb abd abe abi abn abr abs abt ad- ada adb add ade adi adn adr ads adt aea aeb aed aee aei aen aer aes aet ai- aia aib aid aie aii ain air ais ait an- ana anb and ane ani ann anr ans ant ar- ara arb ard are ari arn arr ars art as- asa asb asd ase asi asn asr ass ast at- ata atb atd ate ati atn atr ats att baa bab bad bae bai ban bar bas bat bba bbb bbd bbe bbi bbn bbr bbs bbt bda bdb bdd bde bdi bdr bds bdt be- bea beb bed bee bei ben ber bes bet bi- bia bib bid bie bii bin bir bis bit bna bnb bnd bne bni bnn bnr bns bnt bra brb brd bre bri brn brr brs brt bsa bsb bsd bse bsi bsn bsr bss bst bta btb btd bte bti btn btr bts btt daa dab dad dae dai dan dar das dat dba dbb dbd dbe dbi dbn dbr dbs dbt dda ddb ddd dde ddi ddn ddr dds ddt de- dea deb ded dee dei den der des det di- dia dib did die dii din dir dis dit dna dnb dnd dne dni dnn dnr dns dnt dra drb drd dre dri drn drr drs drt dsa dsb dsd dse dsi dsn dsr dss dst dta dtb dtd dte dti dtn dtr dts dtt eaa eab ead eae eai ean ear eas eat eba ebb ebd ebe ebi ebn ebr ebs ebt ed- eda edb edd ede edi edn edr eds edt eea eeb eed eee een eer ees eet eia eib eid eie eii ein eir eis eit en- ena enb end ene eni enn enr ens ent era erb erd ere eri ern err ers ert es- esa esb esd ese esi esn esr ess est eta etb etd ete eti etn etr ets ett i-d ia- iaa iab iad iae iai ian iar ias iat iba ibb ibd ibe ibi ibn ibr ibs ibt ida idb idd ide idi idn idr ids idt ie- iea ied iee iei ien ier ies iet iia iib iid iie iii iin iir iis iit in- ina inb ind ine ini inn inr ins int ir- ira irb ird ire iri irn irr irs irt is- isa isb isd ise isi isn isr iss ist ita itb itd ite iti itn its itt n-i naa nab nad nae nai nan nar nas nat nba nbb nbd nbe nbi nbn nbr nbs nbt nda ndb ndd nde ndi ndn ndr nds ndt ne- nea neb ned nee nei nen ner nes net nia nib nid nie nii nin nir nis nit nna nnb nne nni nnn nns nnt nra nrb nrd nre nri nrn nrr nrs nrt nsa nsb nsd nse nsi nsn nsr nss nst nta ntb ntd nte nti ntn ntr nts ntt ra- raa rab rad rae rai ran rar ras rat rba rbb rbd rbe rbi rbn rbr rbs rbt rda rdb rdd rde rdi rdn rdr rds rdt re- rea reb red ree rei ren rer res ret ria rib rid rie rii rin rir ris rit rna rnb rnd rni rnn rnr rns rnt rra rrb rrd rri rrn rrr rrs rrt rsa rsb rsd rse rsi rsn rsr rss rst rta rtb rtd rte rti rtn rtr rts rtt saa sab sad sae sai san sar sas sat sba sbb sbd sbe sbi sbn sbr sbs sbt sda sdb sdd sde sdi sdn sdr sds sdt se- sea seb sed see sei sen ser ses set sia sib sid sie sii sin sir sis sit sna snb snd sne sni snn snr sns snt sr- sra srb srd sre sri srn srr srs srt ss- ssa ssb ssd sse ssi ssn ssr sss sst sta stb std ste sti stn str sts stt taa tab tad tae tai tan tar tas tat tba tbb tbd tbe tbi tbn tbr tbs tbt tda tdb tdd tde tdi tdn tdr tds tdt te- tea teb ted tee tei ten ter tes tet tia tib tid tie tii tin tir tis tit tna tnb tnd tne tni tnn tnr tns tnt tra trb trd tre tri trn trr trs trt tsa tsb tsd tse tsi tsn tsr tss tst tta ttb ttd tte tti ttn ttr tts ttt