a-a a-b aaa aab aag aah aak aar ab- aba abb abg abh abk abr ag- aga agb agg agh agk agr aha ahb ahg ahh ahk ahr aka akb akg akh akk akr ar- ara arb arg arh ark arr baa bab bag bah bak bar bba bbb bbg bbh bbk bbr bga bgb bgg bgh bgk bgr bha bhb bhg bhh bhk bhr bka bkb bkg bkk bkr bra brb brg brh brk brr gaa gab gag gah gak gar gba gbg gbh gbk gbr gga ggb ggg ggh ggr gha ghb ghg ghh ghr gka gkb gkh gra grb grg grh grk grr haa hab hag hah hak har hba hbb hbg hbh hbk hbr hga hgb hgg hgh hgk hgr hha hhb hhg hhh hhk hhr hka hkb hkg hkh hkk hkr hr- hra hrb hrg hrh hrk hrr ka- kaa kab kag kah kak kar kba kbb kbh kbk kbr kga kgb kgh kha khh khk khr kkb kkh kkk kkr kra krg krk krr ra- raa rab rag rah rak rar rba rbb rbg rbh rbk rbr rga rgb rgg rgh rgk rgr rh- rha rhb rhg rhh rhr rkb rkg rkk rra rrb rrg rrh rrk rrr