-er -ey a-a a-c aaa aac aae aak aao aar aay ac- aca acc ace ack aco acr acy aea aec aee aek aeo aer aey aka akc ake akk ako akr aoa aoc aoe aok aoo aor ar- ara arc are ark aro arr ary ay- aya ayc aye ayk ayo ayr c-- caa cac cae cak cao car cay cca ccc cce cck cco ccr ce- cea cec cee cek ceo cer cey cka ckc cko cky co- coa coc coe cok coo cor coy cra crc cre crk cro crr cry cya cyc cye cyk cyo cyr eaa eac eae eak eao ear ec- eca ecc ece eck eco ecr eea eec eee eek eeo eer eey eka ekc eke eko ekr eky eo- eoa eoc eoe eok eoo eor era erc ere erk ero err ery eya eyc eye eyo eyr ka- kaa kac kae kak kao kar kay kca kcc kce kck kcr ke- kea kec kee kek keo ker key kkc kke kkk kkr kky koa koc koe kok koo kor koy kra krc krk kro krr kry kya kyc kye kyo kyr oaa oac oae oak oao oar oc- oca occ ock oco ocr oea oec oee oeo oer oey oka okc oke okk oko okr oo- ooa ooc ook ooo oor or- ora orc ore ork oro orr ory oya oye oyo ra- raa rac rae rak rao rar ray rca rcc rce rco rcr re- rea rec ree rek reo rer rey rkc rke rkk rko rky roa roc roe rok roo ror roy rra rrc rrk rrr ry- rya ryc rye ryk ryo ryr ryy yaa yac yae yak yao yar yay yca ycc yce yco ycy yea yec yee yek yeo yer yey yka ykk yoc yoe yok yoo yor yoy yra yrc yre yro yyc yye yyy