-er -ey -ic c-- ccc cce cci cck cco ccr ccs ce- cec cee cei cek ceo cer ces cey ci- cic cie cii cik cio cir cis ckc cki cko cks cky co- coc coe coi cok coo cor cos coy crc cre cri crk cro crr crs cry csc cse csi csk cso csr css csy cyc cye cyk cyo cyr cys ec- ecc ece eci eck eco ecr ecs eec eee eek eeo eer ees eey eic eie eii eik eio eir eis ekc eke eki eko ekr eks eky eo- eoc eoe eoi eok eoo eor eos erc ere eri erk ero err ers ery es- esc ese esi esk eso esr ess esy eyc eye eyo eyr eys icc ice ici ick ico icr ics icy ie- iec iee iei iek ier ies iey iic iie iii iio iir iis ikc ike iki ikk iko ikr iks io- ioc ioe ioi ioo ior ios ir- irc ire iri irk iro irr irs iry is- isc ise isi isk iso isr iss isy iyc iye iyo iyr iys iyy kcc kce kci kck kcr kcs ke- kec kee kei kek keo ker kes key kic kie kii kik kio kir kis kkc kke kki kkk kkr kks kky koc koe koi kok koo kor kos koy krc kri krk kro krr krs kry ksc kse ksi ksk kso ksr kss kyc kye kyo kyr kys o-i oc- occ oci ock oco ocr ocs oec oee oei oeo oer oes oey oic oie oii oik oio oir ois okc oke oki okk oko okr oks oo- ooc ooi ook ooo oor oos or- orc ore ori ork oro orr ors ory os- osc ose osi osk oso osr oss oye oyi oyo oys rcc rce rci rco rcr rcs re- rec ree rei rek reo rer res rey ric rie rii rik rio rir ris riy rkc rke rkk rko rks rky roc roe roi rok roo ror ros roy rrc rri rrk rrr rrs rsc rse rsi rsk rso rsr rss ry- ryc rye ryk ryo ryr rys ryy scc sce sci sck sco scr scs se- sec see sei sek seo ser ses sey sic sie sii sik sio sir sis sk- skc ske ski skk sko skr sks sky soc soe soi sok soo sor sos soy sr- src sre sri srk sro srr srs sry ss- ssc sse ssi ssk sso ssr sss sy- syc sye syi syk syr sys ycc yce yci yco ycs ycy yec yee yei yek yeo yer yes yey yie yii yio yir yis yki ykk yoc yoe yoi yok yoo yor yos yoy yrc yre yro yrs ysc yse ysi ysk yso ysr yss ysy yyc yye yys yyy