a-a a-b aaa aab aad aah aao aas ab- aba abb abd abh abo abs ad- ada adb add adh ado ads aha ahb ahd ahh aho ahs aoa aob aod aoh aoo aos as- asa asb asd ash aso ass baa bab bad bah bao bas bba bbb bbd bbh bbo bbs bda bdb bdd bdh bdo bds bha bhb bhd bhh bho bhs boa bob bod boh boo bos bsa bsb bsd bsh bso bss daa dab dad dah dao das dba dbb dbd dbh dbo dbs dda ddb ddd ddh ddo dds dh- dha dhb dhd dhh dho dhs doa dob dod doh doo dos dsa dsb dsd dsh dso dss haa hab had hah hao has hba hbb hbd hbh hbo hbs hda hdb hdd hdh hdo hds hha hhb hhd hhh hho hhs hoa hob hod hoh hoo hos hsa hsb hsd hsh hss oaa oab oad oah oao oas ob- oba obb obd obh obo obs oda odb odd odh odo ods oha ohd ohh oho ohs oo- ooa oob ood ooh ooo oos os- osa osb osd osh oso oss saa sab sad sah sao sas sba sbb sbd sbh sbo sbs sda sdb sdd sdh sdo sds sh- sha shb shd shh sho shs soa sob sod soh soo sos ss- ssa ssb ssd ssh sso sss