a-a a-b a-z aaa aab aak aan aar aaz ab- aba abb abk abn abr abz aka akb akk akn akr an- ana anb ank ann anr anz ar- ara arb ark arn arr arz az- aza azb azn azz baa bab bak ban bar baz bba bbb bbk bbn bbr bka bkb bkk bkn bkr bna bnb bnk bnn bnr bnz bra brb brk brn brr brz bza bzn bzr bzz k-z ka- kaa kab kak kan kar kaz kba kbb kbk kbn kbr kbz kkb kkk kkn kkr kn- kna knk knn knr kra krk krn krr naa nab nak nan nar naz nba nbb nbk nbn nbr nka nkk nkn nkr nna nnb nnk nnn nnz nra nrb nrk nrn nrr nrz nzb nzz ra- raa rab rak ran rar raz rba rbb rbk rbn rbr rkb rkk rkz rna rnb rnn rnr rnz rra rrb rrk rrn rrr rza rzb zaa zab zak zan zar zaz zbb zbr zka znn zzr zzz