-er -ey c-- ccc cce cck cco ccp ccr ccs ce- cec cee cek ceo cep cer ces cey ckc cko cks cky co- coc coe cok coo cop cor cos coy cpc cpe cpk cpo cpp cpr cps crc cre crk cro crp crr crs cry csc cse csk cso csp csr css csy cyc cye cyk cyo cyp cyr cys ec- ecc ece eck eco ecr ecs eec eee eek eeo eep eer ees eey ekc eke eko ekp ekr eks eky eo- eoc eoe eok eoo eop eor eos ep- epc epe epo epp epr eps erc ere erk ero erp err ers ery es- esc ese esk eso esp esr ess esy eyc eye eyo eyp eyr eys kcc kce kck kcp kcr kcs ke- kec kee kek keo kep ker kes key kkc kke kkk kkp kkr kks kky koc koe kok koo kop kor kos koy kpc kpe kpk kpo kpp kpr kps krc krk kro krp krr krs kry ksc kse ksk kso ksp ksr kss kyc kye kyo kyp kyr kys oc- occ ock oco ocp ocr ocs oec oee oeo oep oer oes oey okc oke okk oko okp okr oks oo- ooc ook ooo oop oor oos op- opc ope opk opo opp opr ops opy or- orc ore ork oro orp orr ors ory os- osc ose osk oso osp osr oss oye oyo oys p-p pcc pce pck pco pcp pcr pcs pec pee pek peo pep per pes pey pkc pke pko pkp pkr pks pky poc poe pok poo pop por pos poy ppc ppe ppk ppo ppp ppr pps prc pre prk pro prp prr prs pry ps- psc pse psk pso psp psr pss psy py- pyc pye pyk pyo pyr pys rcc rce rco rcp rcr rcs re- rec ree rek reo rep rer res rey rkc rke rkk rko rkp rks rky roc roe rok roo rop ror ros roy rpc rpe rpk rpo rpp rpr rps rrc rrk rrp rrr rrs rsc rse rsk rso rsp rsr rss ry- ryc rye ryk ryo ryr rys ryy scc sce sck sco scp scr scs se- sec see sek seo sep ser ses sey sk- skc ske skk sko skp skr sks sky soc soe sok soo sop sor sos soy spc spe spk spo spp spr sps spy sr- src sre srk sro srp srr srs sry ss- ssc sse ssk sso ssp ssr sss sy- syc sye syk syp syr sys ycc yce yco ycp ycs ycy yec yee yek yeo yep yer yes yey ykk yoc yoe yok yoo yop yor yos yoy ypo yps yrc yre yro yrp yrs ysc yse ysk yso ysp ysr yss ysy yyc yye yys yyy