a-a a-b aaa aab aag aah aan aar ab- aba abb abg abh abn abr ag- aga agb agg agh agn agr aha ahb ahg ahh ahn ahr an- ana anb ang anh ann anr ar- ara arb arg arh arn arr baa bab bag bah ban bar bba bbb bbg bbh bbn bbr bga bgb bgg bgh bgn bgr bha bhb bhg bhh bhr bna bnb bng bnn bnr bra brb brg brh brn brr gaa gab gag gah gan gar gba gbg gbh gbn gbr gga ggb ggg ggh ggn ggr gha ghb ghg ghh ghn ghr gna gnb gnn gnr gra grb grg grh grn grr haa hab hag hah han har hba hbb hbg hbh hbn hbr hga hgb hgg hgh hgn hgr hha hhb hhg hhh hhn hhr hna hnb hng hnh hnn hr- hra hrb hrg hrh hrn hrr naa nab nag nah nan nar nba nbb nbg nbn nbr nga ngb ngg ngh ngn nha nhb nhg nhh nhn nhr nna nnb nng nnh nnn nra nrb nrg nrn nrr ra- raa rab rag rah ran rar rba rbb rbg rbh rbn rbr rga rgb rgg rgh rgn rgr rh- rha rhb rhg rhh rhn rhr rna rnb rng rnh rnn rnr rra rrb rrg rrh rrn rrr