-er c-- ccc cce cch cck cco ccr ce- cec cee ceh cek ceo cer ch- chc che chh chk cho chr ckc ckh cko co- coc coe coh cok coo cor crc cre crh crk cro crr ec- ecc ece ech eck eco ecr eec eee eek eeo eer ehc ehe ehh eho ehr ekc eke ekh eko ekr eo- eoc eoe eoh eok eoo eor erc ere erh erk ero err hcc hce hch hck hco hcr he- hec hee heh hek heo her hhc hhe hhh hhk hho hhr hkh hkk hko hkr hoc hoe hoh hok hoo hor hr- hrc hre hrh hrk hro hrr kcc kce kch kck kcr ke- kec kee keh kek keo ker khe khh khk kho khr kkc kke kkh kkk kkr koc koe koh kok koo kor krc krk kro krr oc- occ och ock oco ocr oec oee oeh oeo oer ohc ohe ohh oho ohr okc oke okk oko okr oo- ooc ooh ook ooo oor or- orc ore orh ork oro orr rcc rce rch rco rcr re- rec ree reh rek reo rer rh- rhc rhe rhh rho rhr rkc rke rkk rko roc roe roh rok roo ror rrc rrh rrk rrr