a-a a-b aaa aab aah aak aas ab- aba abb abh abk abs aha ahb ahh ahk ahs aka akb akh akk aks as- asa asb ash ask ass baa bab bah bak bas bba bbb bbh bbk bbs bha bhb bhh bhk bhs bka bkb bkk bks bsa bsb bsh bsk bss haa hab hah hak has hba hbb hbh hbk hbs hha hhb hhh hhk hhs hka hkb hkh hkk hks hsa hsb hsh hsk hss ka- kaa kab kah kak kas kba kbb kbh kbk kbs kha khh khk khs kkb kkh kkk kks ksa ksb ksh ksk kss saa sab sah sak sas sba sbb sbh sbk sbs sh- sha shb shh shk shs sk- ska skb skh skk sks ss- ssa ssb ssh ssk sss