a-a a-b aaa aab aah aak aar ab- aba abb abh abk abr aha ahb ahh ahk ahr aka akb akh akk akr ar- ara arb arh ark arr baa bab bah bak bar bba bbb bbh bbk bbr bha bhb bhh bhk bhr bka bkb bkk bkr bra brb brh brk brr haa hab hah hak har hba hbb hbh hbk hbr hha hhb hhh hhk hhr hka hkb hkh hkk hkr hr- hra hrb hrh hrk hrr ka- kaa kab kah kak kar kba kbb kbh kbk kbr kha khh khk khr kkb kkh kkk kkr kra krk krr ra- raa rab rah rak rar rba rbb rbh rbk rbr rh- rha rhb rhh rhr rkb rkk rra rrb rrh rrk rrr