a-a a-b a-c aaa aab aac aah aam aao aas ab- aba abb abc abh abm abo abs ac- aca acb acc ach acm aco acs aha ahb ahc ahh ahm aho ahs ama amb amc amh amm amo ams aoa aob aoc aoh aom aoo aos as- asa asb asc ash asm aso ass baa bab bac bah bam bao bas bba bbb bbc bbh bbm bbo bbs bca bcb bcc bch bcm bco bcs bha bhb bhc bhh bhm bho bhs bma bmb bmc bmh bmm bmo bms boa bob boc boh bom boo bos bsa bsb bsc bsh bsm bso bss c-- caa cab cac cah cam cao cas cba cbb cbc cbh cbm cbo cbs cca ccb ccc cch ccm cco ccs ch- cha chb chc chh chm cho chs cma cmb cmc cmh cmm cmo cms co- coa cob coc coh com coo cos csa csb csc csh csm cso css haa hab hac hah ham hao has hba hbb hbc hbh hbm hbo hbs hca hcb hcc hch hcm hco hcs hha hhb hhc hhh hhm hho hhs hma hmb hmc hmh hmm hmo hms hoa hob hoc hoh hom hoo hos hsa hsb hsc hsh hsm hss m-o maa mab mac mah mam mao mas mba mbb mbc mbh mbm mbo mbs mc- mca mcb mcc mch mcm mco mcs mha mhc mhh mhm mho mhs mma mmb mmc mmh mmm mmo mms moa mob moc moh mom moo mos msa msb msc msh msm mso mss oaa oab oac oah oam oao oas ob- oba obb obc obh obm obo obs oc- oca ocb occ och ocm oco ocs oha ohc ohh ohm oho ohs om- oma omb omc omh omm omo oms oo- ooa oob ooc ooh oom ooo oos os- osa osb osc osh osm oso oss saa sab sac sah sam sao sas sba sbb sbc sbh sbm sbo sbs sca scb scc sch scm sco scs sh- sha shb shc shh shm sho shs sma smb smc smh smm smo sms soa sob soc soh som soo sos ss- ssa ssb ssc ssh ssm sso sss