a-a a-c a-z aaa aac aan aas aaz ac- aca acc acn acs acz an- ana anc ann ans anz as- asa asc asn ass asz az- aza azn azs azz c-- caa cac can cas caz cca ccc ccn ccs ccz cn- cna cnc cnn cns csa csc csn css csz cz- czc naa nac nan nas naz nca ncc ncn ncs nna nnc nnn nns nnz nsa nsc nsn nss nsz nzs nzz saa sac san sas saz sca scc scn scs sna snc snn sns ss- ssa ssc ssn sss ssz sza zaa zac zan zas zaz zcs znc znn zns zsa zsz zzs zzz