c-- ccc cce cch cck cco ce- cec cee ceh cek ceo ch- chc che chh chk cho ckc ckh cko co- coc coe coh cok coo ec- ecc ece ech eck eco eec eee eek eeo ehc ehe ehh eho ekc eke ekh eko eo- eoc eoe eoh eok eoo hcc hce hch hck hco he- hec hee heh hek heo hhc hhe hhh hhk hho hkh hkk hko hoc hoe hoh hok hoo kcc kce kch kck ke- kec kee keh kek keo khe khh khk kho kkc kke kkh kkk koc koe koh kok koo oc- occ och ock oco oec oee oeh oeo ohc ohe ohh oho okc oke okk oko oo- ooc ooh ook ooo