a-a a-b a-i a-t aaa aab aad aai aas aat ab- aba abb abd abi abs abt ad- ada adb add adi ads adt ai- aia aib aid aii ais ait as- asa asb asd asi ass ast at- ata atb atd ati ats att baa bab bad bai bas bat bba bbb bbd bbi bbs bbt bda bdb bdd bdi bds bdt bi- bia bib bid bii bis bit bsa bsb bsd bsi bss bst bta btb btd bti bts btt daa dab dad dai das dat dba dbb dbd dbi dbs dbt dda ddb ddd ddi dds ddt di- dia dib did dii dis dit dsa dsb dsd dsi dss dst dta dtb dtd dti dts dtt i-d ia- iaa iab iad iai ias iat iba ibb ibd ibi ibs ibt ida idb idd idi ids idt iia iib iid iii iis iit is- isa isb isd isi iss ist ita itb itd iti its itt saa sab sad sai sas sat sba sbb sbd sbi sbs sbt sda sdb sdd sdi sds sdt sia sib sid sii sis sit ss- ssa ssb ssd ssi sss sst sta stb std sti sts stt taa tab tad tai tas tat tba tbb tbd tbi tbs tbt tda tdb tdd tdi tds tdt tia tib tid tii tis tit tsa tsb tsd tsi tss tst tta ttb ttd tti tts ttt