c-- ccc ccd cck ccm cco cdc cdd cdk cdm cdo cdy ckc ckd ckm cko cky cmc cmd cmk cmm cmo cmy co- coc cod cok com coo coy cyc cyd cyk cym cyo dcc dcd dck dcm dco ddc ddd ddk ddm ddo ddy dkc dkk dkm dko dmc dmd dmk dmm dmo doc dod dok dom doo doy dy- dyc dyd dyk dym dyo dyy kcc kcd kck kcm kdc kdk kdm kdo kdy kkc kkk kkm kky kmc kmd kmk kmm kmo koc kod kok kom koo koy kyc kyd kym kyo m-o mc- mcc mcd mck mcm mco mdc mdd mdk mdm mdo mdy mkc mkd mkk mkm mko mky mmc mmd mmk mmm mmo moc mod mok mom moo moy my- myc myd myk mym myo oc- occ ocd ock ocm oco odc odd odm odo okc okd okk oko om- omc omd omm omo omy oo- ooc ood ook oom ooo oyd oyo ycc ycd yco ycy ydo ydy ykk ykm ymc ymm ymo yoc yod yok yom yoo yoy yyc yyy