a-a a-b aaa aab aah aam aao aas ab- aba abb abh abm abo abs aha ahb ahh ahm aho ahs ama amb amh amm amo ams aoa aob aoh aom aoo aos as- asa asb ash asm aso ass baa bab bah bam bao bas bba bbb bbh bbm bbo bbs bha bhb bhh bhm bho bhs bma bmb bmh bmm bmo bms boa bob boh bom boo bos bsa bsb bsh bsm bso bss haa hab hah ham hao has hba hbb hbh hbm hbo hbs hha hhb hhh hhm hho hhs hma hmb hmh hmm hmo hms hoa hob hoh hom hoo hos hsa hsb hsh hsm hss m-o maa mab mah mam mao mas mba mbb mbh mbm mbo mbs mha mhh mhm mho mhs mma mmb mmh mmm mmo mms moa mob moh mom moo mos msa msb msh msm mso mss oaa oab oah oam oao oas ob- oba obb obh obm obo obs oha ohh ohm oho ohs om- oma omb omh omm omo oms oo- ooa oob ooh oom ooo oos os- osa osb osh osm oso oss saa sab sah sam sao sas sba sbb sbh sbm sbo sbs sh- sha shb shh shm sho shs sma smb smh smm smo sms soa sob soh som soo sos ss- ssa ssb ssh ssm sso sss