a-a a-c aaa aac aak aam aao aas ac- aca acc ack acm aco acs aka akc akk akm ako aks ama amc amk amm amo ams aoa aoc aok aom aoo aos as- asa asc ask asm aso ass c-- caa cac cak cam cao cas cca ccc cck ccm cco ccs cka ckc ckm cko cks cma cmc cmk cmm cmo cms co- coa coc cok com coo cos csa csc csk csm cso css ka- kaa kac kak kam kao kas kca kcc kck kcm kcs kkc kkk kkm kks kma kmc kmk kmm kmo kms koa koc kok kom koo kos ksa ksc ksk ksm kso kss m-o maa mac mak mam mao mas mc- mca mcc mck mcm mco mcs mka mkc mkk mkm mko mks mma mmc mmk mmm mmo mms moa moc mok mom moo mos msa msc msk msm mso mss oaa oac oak oam oao oas oc- oca occ ock ocm oco ocs oka okc okk oko oks om- oma omc omm omo oms oo- ooa ooc ook oom ooo oos os- osa osc osk osm oso oss saa sac sak sam sao sas sca scc sck scm sco scs sk- ska skc skk skm sko sks sma smc smk smm smo sms soa soc sok som soo sos ss- ssa ssc ssk ssm sso sss