a-a a-b aaa aab aag aak aan aar ab- aba abb abg abk abn abr ag- aga agb agg agk agn agr aka akb akg akk akn akr an- ana anb ang ank ann anr ar- ara arb arg ark arn arr baa bab bag bak ban bar bba bbb bbg bbk bbn bbr bga bgb bgg bgk bgn bgr bka bkb bkg bkk bkn bkr bna bnb bng bnk bnn bnr bra brb brg brk brn brr gaa gab gag gak gan gar gba gbg gbk gbn gbr gga ggb ggg ggn ggr gka gkb gkn gna gnb gnn gnr gra grb grg grk grn grr ka- kaa kab kag kak kan kar kba kbb kbk kbn kbr kga kgb kkb kkk kkn kkr kn- kna kng knk knn knr kra krg krk krn krr naa nab nag nak nan nar nba nbb nbg nbk nbn nbr nga ngb ngg ngk ngn nka nkk nkn nkr nna nnb nng nnk nnn nra nrb nrg nrk nrn nrr ra- raa rab rag rak ran rar rba rbb rbg rbk rbn rbr rga rgb rgg rgk rgn rgr rkb rkg rkk rna rnb rng rnn rnr rra rrb rrg rrk rrn rrr