a-a a-b a-t aaa aab aad aak aas aat ab- aba abb abd abk abs abt ad- ada adb add adk ads adt aka akb akd akk aks as- asa asb asd ask ass ast at- ata atb atd ats att baa bab bad bak bas bat bba bbb bbd bbk bbs bbt bda bdb bdd bdk bds bdt bka bkb bkk bks bkt bsa bsb bsd bsk bss bst bta btb btd btk bts btt daa dab dad dak das dat dba dbb dbd dbk dbs dbt dda ddb ddd ddk dds ddt dka dkb dkk dks dkt dsa dsb dsd dsk dss dst dta dtb dtd dtk dts dtt k-t ka- kaa kab kad kak kas kat kba kbb kbd kbk kbs kda kdb kdk kds kdt kkb kkk kks kkt ksa ksb ksd ksk kss kst kta ktb ktk kts ktt saa sab sad sak sas sat sba sbb sbd sbk sbs sbt sda sdb sdd sdk sds sdt sk- ska skb skd skk sks skt ss- ssa ssb ssd ssk sss sst sta stb std stk sts stt taa tab tad tak tas tat tba tbb tbd tbk tbs tbt tda tdb tdd tdk tds tdt tka tkb tkk tks tkt tsa tsb tsd tsk tss tst tta ttb ttd ttk tts ttt