a-a a-b a-z aaa aab aan aar aas aaz ab- aba abb abn abr abs abz an- ana anb ann anr ans anz ar- ara arb arn arr ars arz as- asa asb asn asr ass asz az- aza azb azn azs azz baa bab ban bar bas baz bba bbb bbn bbr bbs bna bnb bnn bnr bns bnz bra brb brn brr brs brz bsa bsb bsn bsr bss bza bzn bzr bzs bzz naa nab nan nar nas naz nba nbb nbn nbr nbs nna nnb nnn nns nnz nra nrb nrn nrr nrs nrz nsa nsb nsn nsr nss nsz nzb nzs nzz ra- raa rab ran rar ras raz rba rbb rbn rbr rbs rna rnb rnn rnr rns rnz rra rrb rrn rrr rrs rsa rsb rsn rsr rss rza rzb saa sab san sar sas saz sba sbb sbn sbr sbs sna snb snn snr sns sr- sra srb srn srr srs ss- ssa ssb ssn ssr sss ssz sza szr zaa zab zan zar zas zaz zbb zbr zbs znn zns zrs zsa zsz zzr zzs zzz