a-a a-b aaa aab aad aah aak aas ab- aba abb abd abh abk abs ad- ada adb add adh adk ads aha ahb ahd ahh ahk ahs aka akb akd akh akk aks as- asa asb asd ash ask ass baa bab bad bah bak bas bba bbb bbd bbh bbk bbs bda bdb bdd bdh bdk bds bha bhb bhd bhh bhk bhs bka bkb bkk bks bsa bsb bsd bsh bsk bss daa dab dad dah dak das dba dbb dbd dbh dbk dbs dda ddb ddd ddh ddk dds dh- dha dhb dhd dhh dhk dhs dka dkb dkk dks dsa dsb dsd dsh dsk dss haa hab had hah hak has hba hbb hbd hbh hbk hbs hda hdb hdd hdh hdk hds hha hhb hhd hhh hhk hhs hka hkb hkd hkh hkk hks hsa hsb hsd hsh hsk hss ka- kaa kab kad kah kak kas kba kbb kbd kbh kbk kbs kda kdb kdh kdk kds kha khh khk khs kkb kkh kkk kks ksa ksb ksd ksh ksk kss saa sab sad sah sak sas sba sbb sbd sbh sbk sbs sda sdb sdd sdh sdk sds sh- sha shb shd shh shk shs sk- ska skb skd skh skk sks ss- ssa ssb ssd ssh ssk sss