c-- ccc ccd cce cch cck cco cdc cdd cde cdh cdk cdo ce- cec ced cee ceh cek ceo ch- chc chd che chh chk cho ckc ckd ckh cko co- coc cod coe coh cok coo dcc dcd dce dck dco ddc ddd dde ddh ddk ddo de- dec ded dee deh dek deo dh- dhc dhd dhe dhh dhk dho dkc dke dkk dko doc dod doe doh dok doo ec- ecc ecd ece ech eck eco ed- edc edd ede edh edk edo eec eed eee eek eeo ehc ehd ehe ehh eho ekc ekd eke ekh eko eo- eoc eod eoe eoh eok eoo hcc hcd hce hch hck hco hdc hdd hde hdh hdk hdo he- hec hed hee heh hek heo hhc hhd hhe hhh hhk hho hkd hkh hkk hko hoc hod hoe hoh hok hoo kcc kcd kce kch kck kdc kde kdh kdk kdo ke- kec ked kee keh kek keo khe khh khk kho kkc kke kkh kkk koc kod koe koh kok koo oc- occ ocd och ock oco odc odd ode odh odo oec oed oee oeh oeo ohc ohd ohe ohh oho okc okd oke okk oko oo- ooc ood ooh ook ooo