-er c-- ccc cce cck cco ccr ccs ccv ce- cec cee cek ceo cer ces cev ckc cko cks co- coc coe cok coo cor cos cov crc cre crk cro crr crs crv csc cse csk cso csr css csv cvc cve cvk cvo cvr cvs cvv ec- ecc ece eck eco ecr ecs ecv eec eee eek eeo eer ees eev ekc eke eko ekr eks ekv eo- eoc eoe eok eoo eor eos erc ere erk ero err ers erv es- esc ese esk eso esr ess esv evc eve evo evr evs evv kcc kce kck kcr kcs ke- kec kee kek keo ker kes kev kkc kke kkk kkr kks kkv koc koe kok koo kor kos krc krk kro krr krs krv ksc kse ksk kso ksr kss ksv kvk kvo kvr kvs kvv oc- occ ock oco ocr ocs ocv oec oee oeo oer oes okc oke okk oko okr oks oo- ooc ook ooo oor oos oov or- orc ore ork oro orr ors orv os- osc ose osk oso osr oss osv ov- ovc ove ovo ovs ovv rcc rce rco rcr rcs rcv re- rec ree rek reo rer res rev rkc rke rkk rko rks rkv roc roe rok roo ror ros rov rrc rrk rrr rrs rsc rse rsk rso rsr rss rsv rvc rve rvo rvr rvs rvv scc sce sck sco scr scs scv se- sec see sek seo ser ses sev sk- skc ske skk sko skr sks soc soe sok soo sor sos sov sr- src sre srk sro srr srs srv ss- ssc sse ssk sso ssr sss ssv svc sve svk svo svr svs svv v-e vcc vce vco vcr vcs vec vee vek veo ver ves voc voe vok voo vor vos vov vrc vre vrk vrr vrs vsc vse vsk vso vsr vss vsv vvc vvo vvr vvs vvv

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