a-a a-b aaa aab aah aak aar aas ab- aba abb abh abk abr abs aha ahb ahh ahk ahr ahs aka akb akh akk akr aks ar- ara arb arh ark arr ars as- asa asb ash ask asr ass baa bab bah bak bar bas bba bbb bbh bbk bbr bbs bha bhb bhh bhk bhr bhs bka bkb bkk bkr bks bra brb brh brk brr brs bsa bsb bsh bsk bsr bss haa hab hah hak har has hba hbb hbh hbk hbr hbs hha hhb hhh hhk hhr hhs hka hkb hkh hkk hkr hks hr- hra hrb hrh hrk hrr hrs hsa hsb hsh hsk hsr hss ka- kaa kab kah kak kar kas kba kbb kbh kbk kbr kbs kha khh khk khr khs kkb kkh kkk kkr kks kra krk krr krs ksa ksb ksh ksk ksr kss ra- raa rab rah rak rar ras rba rbb rbh rbk rbr rbs rh- rha rhb rhh rhr rhs rkb rkk rks rra rrb rrh rrk rrr rrs rsa rsb rsh rsk rsr rss saa sab sah sak sar sas sba sbb sbh sbk sbr sbs sh- sha shb shh shk shr shs sk- ska skb skh skk skr sks sr- sra srb srh srk srr srs ss- ssa ssb ssh ssk ssr sss