a-a a-z aaa aaf aag aan aaz af- afa aff afg afn afz ag- aga agf agg agn agz an- ana anf ang ann anz az- aza azf azg azn azz faa faf fag fan faz ffa fff ffg ffn ffz fga fgf fgg fgn fgz fna fnf fng fnn fnz gaa gaf gag gan gaz gfa gff gfz gga ggg ggn ggz gna gnf gnn gza naa naf nag nan naz nfa nff nfn nga ngf ngg ngn nna nnf nng nnn nnz nzf nzg nzz z-g zaa zaf zag zan zaz zfa zfn zgg znn zzz