a-a a-b a-i a-t aaa aab aad aae aai aak aas aat ab- aba abb abd abe abi abk abs abt ad- ada adb add ade adi adk ads adt aea aeb aed aee aei aek aes aet ai- aia aib aid aie aii aik ais ait aka akb akd ake aki akk aks as- asa asb asd ase asi ask ass ast at- ata atb atd ate ati ats att baa bab bad bae bai bak bas bat bba bbb bbd bbe bbi bbk bbs bbt bda bdb bdd bde bdi bdk bds bdt be- bea beb bed bee bei bek bes bet bi- bia bib bid bie bii bik bis bit bka bkb bke bkk bks bkt bsa bsb bsd bse bsi bsk bss bst bta btb btd bte bti btk bts btt daa dab dad dae dai dak das dat dba dbb dbd dbe dbi dbk dbs dbt dda ddb ddd dde ddi ddk dds ddt de- dea deb ded dee dei dek des det di- dia dib did die dii dik dis dit dka dkb dke dki dkk dks dkt dsa dsb dsd dse dsi dsk dss dst dta dtb dtd dte dti dtk dts dtt eaa eab ead eae eai eak eas eat eba ebb ebd ebe ebi ebk ebs ebt ed- eda edb edd ede edi edk eds edt eea eeb eed eee eek ees eet eia eib eid eie eii eik eis eit eka ekb ekd eke eki eks ekt es- esa esb esd ese esi esk ess est eta etb etd ete eti etk ets ett i-d ia- iaa iab iad iae iai ias iat iba ibb ibd ibe ibi ibk ibs ibt ida idb idd ide idi idk ids idt ie- iea ied iee iei iek ies iet iia iib iid iie iii iis iit ika ikb ike iki ikk iks ikt is- isa isb isd ise isi isk iss ist ita itb itd ite iti itk its itt k-t ka- kaa kab kad kae kai kak kas kat kba kbb kbd kbe kbi kbk kbs kda kdb kde kdk kds kdt ke- kea keb ked kee kei kek kes ket kia kib kid kie kii kik kis kit kkb kke kki kkk kks kkt ksa ksb ksd kse ksi ksk kss kst kta ktb kte ktk kts ktt saa sab sad sae sai sak sas sat sba sbb sbd sbe sbi sbk sbs sbt sda sdb sdd sde sdi sdk sds sdt se- sea seb sed see sei sek ses set sia sib sid sie sii sik sis sit sk- ska skb skd ske ski skk sks skt ss- ssa ssb ssd sse ssi ssk sss sst sta stb std ste sti stk sts stt taa tab tad tae tai tak tas tat tba tbb tbd tbe tbi tbk tbs tbt tda tdb tdd tde tdi tdk tds tdt te- tea teb ted tee tei tek tes tet tia tib tid tie tii tik tis tit tka tkb tke tkk tks tkt tsa tsb tsd tse tsi tsk tss tst tta ttb ttd tte tti ttk tts ttt