a-a a-b a-z aaa aab aam aas aaz ab- aba abb abm abs abz ama amb amm ams amz as- asa asb asm ass asz az- aza azb azm azs azz baa bab bam bas baz bba bbb bbm bbs bma bmb bmm bms bmz bsa bsb bsm bss bza bzs bzz maa mab mam mas maz mba mbb mbm mbs mma mmb mmm mms mmz msa msb msm mss mza mzb mzm saa sab sam sas saz sba sbb sbm sbs sma smb smm sms smz ss- ssa ssb ssm sss ssz sza zaa zab zam zas zaz zbb zbm zbs zma zmb zmm zms zsa zsm zsz zzs zzz