a-a a-b a-t aaa aab aad aae aao aas aat ab- aba abb abd abe abo abs abt ad- ada adb add ade ado ads adt aea aeb aed aee aeo aes aet aoa aob aod aoe aoo aos aot as- asa asb asd ase aso ass ast at- ata atb atd ate ato ats att baa bab bad bae bao bas bat bba bbb bbd bbe bbo bbs bbt bda bdb bdd bde bdo bds bdt be- bea beb bed bee beo bes bet boa bob bod boe boo bos bot bsa bsb bsd bse bso bss bst bta btb btd bte bto bts btt daa dab dad dae dao das dat dba dbb dbd dbe dbo dbs dbt dda ddb ddd dde ddo dds ddt de- dea deb ded dee deo des det doa dob dod doe doo dos dot dsa dsb dsd dse dso dss dst dta dtb dtd dte dto dts dtt eaa eab ead eae eao eas eat eba ebb ebd ebe ebo ebs ebt ed- eda edb edd ede edo eds edt eea eeb eed eee eeo ees eet eo- eoa eob eod eoe eoo eos eot es- esa esb esd ese eso ess est eta etb etd ete eto ets ett oaa oab oad oae oao oas oat ob- oba obb obd obe obo obs obt oda odb odd ode odo ods odt oea oeb oed oee oeo oes oet oo- ooa oob ood ooo oos oot os- osa osb osd ose oso oss ost ot- ota otb otd ote oto ots ott saa sab sad sae sao sas sat sba sbb sbd sbe sbo sbs sbt sda sdb sdd sde sdo sds sdt se- sea seb sed see seo ses set soa sob sod soe soo sos sot ss- ssa ssb ssd sse sso sss sst sta stb std ste sto sts stt taa tab tad tae tao tas tat tba tbb tbd tbe tbo tbs tbt tda tdb tdd tde tdo tds tdt te- tea teb ted tee teo tes tet to- toa tob tod toe too tos tot tsa tsb tsd tse tso tss tst tta ttb ttd tte tto tts ttt