a-a a-b a-i a-t aaa aab aad aae aai aas aat ab- aba abb abd abe abi abs abt ad- ada adb add ade adi ads adt aea aeb aed aee aei aes aet ai- aia aib aid aie aii ais ait as- asa asb asd ase asi ass ast at- ata atb atd ate ati ats att baa bab bad bae bai bas bat bba bbb bbd bbe bbi bbs bbt bda bdb bdd bde bdi bds bdt be- bea beb bed bee bei bes bet bi- bia bib bid bie bii bis bit bsa bsb bsd bse bsi bss bst bta btb btd bte bti bts btt daa dab dad dae dai das dat dba dbb dbd dbe dbi dbs dbt dda ddb ddd dde ddi dds ddt de- dea deb ded dee dei des det di- dia dib did die dii dis dit dsa dsb dsd dse dsi dss dst dta dtb dtd dte dti dts dtt eaa eab ead eae eai eas eat eba ebb ebd ebe ebi ebs ebt ed- eda edb edd ede edi eds edt eea eeb eed eee ees eet eia eib eid eie eii eis eit es- esa esb esd ese esi ess est eta etb etd ete eti ets ett i-d ia- iaa iab iad iae iai ias iat iba ibb ibd ibe ibi ibs ibt ida idb idd ide idi ids idt ie- iea ied iee iei ies iet iia iib iid iie iii iis iit is- isa isb isd ise isi iss ist ita itb itd ite iti its itt saa sab sad sae sai sas sat sba sbb sbd sbe sbi sbs sbt sda sdb sdd sde sdi sds sdt se- sea seb sed see sei ses set sia sib sid sie sii sis sit ss- ssa ssb ssd sse ssi sss sst sta stb std ste sti sts stt taa tab tad tae tai tas tat tba tbb tbd tbe tbi tbs tbt tda tdb tdd tde tdi tds tdt te- tea teb ted tee tei tes tet tia tib tid tie tii tis tit tsa tsb tsd tse tsi tss tst tta ttb ttd tte tti tts ttt