c-- ccc ccd cch cck cco cdc cdd cdh cdk cdo cdy ch- chc chd chh chk cho chy ckc ckd ckh cko cky co- coc cod coh cok coo coy cyc cyd cyk cyo dcc dcd dck dco ddc ddd ddh ddk ddo ddy dh- dhc dhd dhh dhk dho dkc dkk dko doc dod doh dok doo doy dy- dyc dyd dyk dyo dyy hcc hcd hch hck hco hcy hdc hdd hdh hdk hdo hdy hhc hhd hhh hhk hho hhy hkd hkh hkk hko hoc hod hoh hok hoo hoy hy- hyc hyd hyh hyo hyy kcc kcd kch kck kdc kdh kdk kdo kdy khh khk kho kkc kkh kkk kky koc kod koh kok koo koy kyc kyd kyo oc- occ ocd och ock oco odc odd odh odo ohc ohd ohh oho okc okd okk oko oo- ooc ood ooh ook ooo oyd oyo ycc ycd ych yco ycy ydo ydy yhc ykk yoc yod yok yoo yoy yyc yyy