-er -ey c-- ccc cce cck cco ccr ce- cec cee cek ceo cer cey ckc cko cky co- coc coe cok coo cor coy crc cre crk cro crr cry cyc cye cyk cyo cyr ec- ecc ece eck eco ecr eec eee eek eeo eer eey ekc eke eko ekr eky eo- eoc eoe eok eoo eor erc ere erk ero err ery eyc eye eyo eyr kcc kce kck kcr ke- kec kee kek keo ker key kkc kke kkk kkr kky koc koe kok koo kor koy krc krk kro krr kry kyc kye kyo kyr oc- occ ock oco ocr oec oee oeo oer oey okc oke okk oko okr oo- ooc ook ooo oor or- orc ore ork oro orr ory oye oyo rcc rce rco rcr re- rec ree rek reo rer rey rkc rke rkk rko rky roc roe rok roo ror roy rrc rrk rrr ry- ryc rye ryk ryo ryr ryy ycc yce yco ycy yec yee yek yeo yer yey ykk yoc yoe yok yoo yor yoy yrc yre yro yyc yye yyy