a-a a-b a-z aaa aab aan aas aaz ab- aba abb abn abs abz an- ana anb ann ans anz as- asa asb asn ass asz az- aza azb azn azs azz baa bab ban bas baz bba bbb bbn bbs bna bnb bnn bns bnz bsa bsb bsn bss bza bzn bzs bzz naa nab nan nas naz nba nbb nbn nbs nna nnb nnn nns nnz nsa nsb nsn nss nsz nzb nzs nzz saa sab san sas saz sba sbb sbn sbs sna snb snn sns ss- ssa ssb ssn sss ssz sza zaa zab zan zas zaz zbb zbs znn zns zsa zsz zzs zzz