a-a a-b a-z aaa aab aag aak aar aaz ab- aba abb abg abk abr abz ag- aga agb agg agk agr agz aka akb akg akk akr ar- ara arb arg ark arr arz az- aza azb azg azz baa bab bag bak bar baz bba bbb bbg bbk bbr bga bgb bgg bgk bgr bgz bka bkb bkg bkk bkr bra brb brg brk brr brz bza bzr bzz gaa gab gag gak gar gaz gba gbg gbk gbr gbz gga ggb ggg ggr ggz gka gkb gra grb grg grk grr gza gzr k-z ka- kaa kab kag kak kar kaz kba kbb kbk kbr kbz kga kgb kkb kkk kkr kra krg krk krr ra- raa rab rag rak rar raz rba rbb rbg rbk rbr rga rgb rgg rgk rgr rkb rkg rkk rkz rra rrb rrg rrk rrr rza rzb z-g zaa zab zag zak zar zaz zbb zbr zgb zgg zka zzr zzz