-th a-a a-b a-t aaa aab aad aah aas aat ab- aba abb abd abh abs abt ad- ada adb add adh ads adt aha ahb ahd ahh ahs aht as- asa asb asd ash ass ast at- ata atb atd ath ats att baa bab bad bah bas bat bba bbb bbd bbh bbs bbt bda bdb bdd bdh bds bdt bha bhb bhd bhh bhs bht bsa bsb bsd bsh bss bst bta btb btd bth bts btt daa dab dad dah das dat dba dbb dbd dbh dbs dbt dda ddb ddd ddh dds ddt dh- dha dhb dhd dhh dhs dht dsa dsb dsd dsh dss dst dta dtb dtd dth dts dtt haa hab had hah has hat hba hbb hbd hbh hbs hbt hda hdb hdd hdh hds hdt hha hhb hhd hhh hhs hht hsa hsb hsd hsh hss hst hta htb htd hth hts htt saa sab sad sah sas sat sba sbb sbd sbh sbs sbt sda sdb sdd sdh sds sdt sh- sha shb shd shh shs sht ss- ssa ssb ssd ssh sss sst sta stb std sth sts stt taa tab tad tah tas tat tba tbb tbd tbh tbs tbt tda tdb tdd tdh tds tdt th- tha thb thd thh ths tht tsa tsb tsd tsh tss tst tta ttb ttd tth tts ttt