-er c-- ccc cce ccf cch cck cco ccr ce- cec cee cef ceh cek ceo cer cfc cfe cff cfh cfk cfo cfr ch- chc che chf chh chk cho chr ckc ckh cko co- coc coe cof coh cok coo cor crc cre crf crh crk cro crr ec- ecc ece ecf ech eck eco ecr eec eee eef eek eeo eer ef- efc efe eff efh efo efr ehc ehe ehf ehh eho ehr ekc eke ekf ekh eko ekr eo- eoc eoe eof eoh eok eoo eor erc ere erf erh erk ero err fcc fce fcf fck fco fcr fec fee fef feh fek feo fer ffc ffe fff ffh ffk ffo ffr fhc fhe fhf fhh fho fhr fkc fkf fkk foc foe fof foh fok foo for frc fre frf frh frk fro frr hcc hce hcf hch hck hco hcr he- hec hee hef heh hek heo her hfc hfe hff hfh hfk hfo hfr hhc hhe hhf hhh hhk hho hhr hkf hkh hkk hko hkr hoc hoe hof hoh hok hoo hor hr- hrc hre hrf hrh hrk hro hrr kcc kce kch kck kcr ke- kec kee kef keh kek keo ker kfc kff kfh kfo khe khf khh khk kho khr kkc kke kkh kkk kkr koc koe kof koh kok koo kor krc krf krk kro krr oc- occ ocf och ock oco ocr oec oee oef oeh oeo oer of- ofc ofe off ofo ofr ohc ohe ohf ohh oho ohr okc oke okk oko okr oo- ooc oof ooh ook ooo oor or- orc ore orf orh ork oro orr rcc rce rcf rch rco rcr re- rec ree ref reh rek reo rer rfc rfe rff rfh rfk rfo rfr rh- rhc rhe rhf rhh rho rhr rkc rke rkf rkk rko roc roe rof roh rok roo ror rrc rrf rrh rrk rrr