-th a-a a-b a-t aaa aab aad aah aao aas aat ab- aba abb abd abh abo abs abt ad- ada adb add adh ado ads adt aha ahb ahd ahh aho ahs aht aoa aob aod aoh aoo aos aot as- asa asb asd ash aso ass ast at- ata atb atd ath ato ats att baa bab bad bah bao bas bat bba bbb bbd bbh bbo bbs bbt bda bdb bdd bdh bdo bds bdt bha bhb bhd bhh bho bhs bht boa bob bod boh boo bos bot bsa bsb bsd bsh bso bss bst bta btb btd bth bto bts btt daa dab dad dah dao das dat dba dbb dbd dbh dbo dbs dbt dda ddb ddd ddh ddo dds ddt dh- dha dhb dhd dhh dho dhs dht doa dob dod doh doo dos dot dsa dsb dsd dsh dso dss dst dta dtb dtd dth dto dts dtt haa hab had hah hao has hat hba hbb hbd hbh hbo hbs hbt hda hdb hdd hdh hdo hds hdt hha hhb hhd hhh hho hhs hht hoa hob hod hoh hoo hos hot hsa hsb hsd hsh hss hst hta htb htd hth hto hts htt oaa oab oad oah oao oas oat ob- oba obb obd obh obo obs obt oda odb odd odh odo ods odt oha ohd ohh oho ohs oht oo- ooa oob ood ooh ooo oos oot os- osa osb osd osh oso oss ost ot- ota otb otd oth oto ots ott saa sab sad sah sao sas sat sba sbb sbd sbh sbo sbs sbt sda sdb sdd sdh sdo sds sdt sh- sha shb shd shh sho shs sht soa sob sod soh soo sos sot ss- ssa ssb ssd ssh sso sss sst sta stb std sth sto sts stt taa tab tad tah tao tas tat tba tbb tbd tbh tbo tbs tbt tda tdb tdd tdh tdo tds tdt th- tha thb thd thh tho ths tht to- toa tob tod toh too tos tot tsa tsb tsd tsh tso tss tst tta ttb ttd tth tto tts ttt