a-a a-b a-z aaa aab aam aao aas aaz ab- aba abb abm abo abs abz ama amb amm amo ams amz aoa aob aom aoo aos as- asa asb asm aso ass asz az- aza azb azm azo azs azz baa bab bam bao bas baz bba bbb bbm bbo bbs bma bmb bmm bmo bms bmz boa bob bom boo bos boz bsa bsb bsm bso bss bza bzo bzs bzz m-o maa mab mam mao mas maz mba mbb mbm mbo mbs mma mmb mmm mmo mms mmz moa mob mom moo mos moz msa msb msm mso mss mza mzb mzm oaa oab oam oao oas ob- oba obb obm obo obs om- oma omb omm omo oms omz oo- ooa oob oom ooo oos os- osa osb osm oso oss oza ozm ozo ozs ozz saa sab sam sao sas saz sba sbb sbm sbo sbs sma smb smm smo sms smz soa sob som soo sos soz ss- ssa ssb ssm sso sss ssz sza zaa zab zam zao zas zaz zbb zbm zbs zma zmb zmm zms zo- zoa zob zom zoo zos zsa zsm zsz zzs zzz