a-a a-b aaa aab aad aah aas ab- aba abb abd abh abs ad- ada adb add adh ads aha ahb ahd ahh ahs as- asa asb asd ash ass baa bab bad bah bas bba bbb bbd bbh bbs bda bdb bdd bdh bds bha bhb bhd bhh bhs bsa bsb bsd bsh bss daa dab dad dah das dba dbb dbd dbh dbs dda ddb ddd ddh dds dh- dha dhb dhd dhh dhs dsa dsb dsd dsh dss haa hab had hah has hba hbb hbd hbh hbs hda hdb hdd hdh hds hha hhb hhd hhh hhs hsa hsb hsd hsh hss saa sab sad sah sas sba sbb sbd sbh sbs sda sdb sdd sdh sds sh- sha shb shd shh shs ss- ssa ssb ssd ssh sss