-er -ey c-- ccc cce cck cco ccr ccs ccv ce- cec cee cek ceo cer ces cev cey ckc cko cks cky co- coc coe cok coo cor cos cov coy crc cre crk cro crr crs crv cry csc cse csk cso csr css csv csy cvc cve cvk cvo cvr cvs cvv cyc cye cyk cyo cyr cys ec- ecc ece eck eco ecr ecs ecv eec eee eek eeo eer ees eev eey ekc eke eko ekr eks ekv eky eo- eoc eoe eok eoo eor eos erc ere erk ero err ers erv ery es- esc ese esk eso esr ess esv esy evc eve evo evr evs evv evy eyc eye eyo eyr eys kcc kce kck kcr kcs ke- kec kee kek keo ker kes kev key kkc kke kkk kkr kks kkv kky koc koe kok koo kor kos koy krc krk kro krr krs krv kry ksc kse ksk kso ksr kss ksv kvk kvo kvr kvs kvv kyc kye kyo kyr kys oc- occ ock oco ocr ocs ocv oec oee oeo oer oes oey okc oke okk oko okr oks oo- ooc ook ooo oor oos oov or- orc ore ork oro orr ors orv ory os- osc ose osk oso osr oss osv ov- ovc ove ovo ovs ovv oye oyo oys rcc rce rco rcr rcs rcv re- rec ree rek reo rer res rev rey rkc rke rkk rko rks rkv rky roc roe rok roo ror ros rov roy rrc rrk rrr rrs rsc rse rsk rso rsr rss rsv rvc rve rvo rvr rvs rvv rvy ry- ryc rye ryk ryo ryr rys ryy scc sce sck sco scr scs scv se- sec see sek seo ser ses sev sey sk- skc ske skk sko skr sks sky soc soe sok soo sor sos sov soy sr- src sre srk sro srr srs srv sry ss- ssc sse ssk sso ssr sss ssv svc sve svk svo svr svs svv svy sy- syc sye syk syr sys v-e vcc vce vco vcr vcs vcy vec vee vek veo ver ves vey voc voe vok voo vor vos vov voy vrc vre vrk vrr vrs vry vsc vse vsk vso vsr vss vsv vvc vvo vvr vvs vvv vye ycc yce yco ycs ycv ycy yec yee yek yeo yer yes yev yey ykk yoc yoe yok yoo yor yos yoy yrc yre yro yrs ysc yse ysk yso ysr yss ysy yve yvo yvr yvy yyc yye yys yyy