-er -ey c-- ccc cce cck cco ccr ccs cct ce- cec cee cek ceo cer ces cet cey ckc cko cks ckt cky co- coc coe cok coo cor cos cot coy crc cre crk cro crr crs crt cry csc cse csk cso csr css cst csy ctc cte ctk cto ctr cts ctt cty cyc cye cyk cyo cyr cys cyt ec- ecc ece eck eco ecr ecs ect eec eee eek eeo eer ees eet eey ekc eke eko ekr eks ekt eky eo- eoc eoe eok eoo eor eos eot erc ere erk ero err ers ert ery es- esc ese esk eso esr ess est esy etc ete etk eto etr ets ett ety eyc eye eyo eyr eys eyt k-t kcc kce kck kcr kcs kct ke- kec kee kek keo ker kes ket key kkc kke kkk kkr kks kkt kky koc koe kok koo kor kos kot koy krc krk kro krr krs krt kry ksc kse ksk kso ksr kss kst ktc kte ktk kto ktr kts ktt kyc kye kyo kyr kys kyt oc- occ ock oco ocr ocs oct oec oee oeo oer oes oet oey okc oke okk oko okr oks oo- ooc ook ooo oor oos oot or- orc ore ork oro orr ors ort ory os- osc ose osk oso osr oss ost ot- otc ote otk oto otr ots ott oye oyo oys rcc rce rco rcr rcs rct re- rec ree rek reo rer res ret rey rkc rke rkk rko rks rkt rky roc roe rok roo ror ros rot roy rrc rrk rrr rrs rrt rsc rse rsk rso rsr rss rst rtc rte rtk rto rtr rts rtt rty ry- ryc rye ryk ryo ryr rys ryy scc sce sck sco scr scs sct se- sec see sek seo ser ses set sey sk- skc ske skk sko skr sks skt sky soc soe sok soo sor sos sot soy sr- src sre srk sro srr srs srt sry ss- ssc sse ssk sso ssr sss sst stc ste stk sto str sts stt sty sy- syc sye syk syr sys syt tcc tce tck tco tcr tcs tct te- tec tee tek teo ter tes tet tey tkc tke tkk tko tkr tks tkt tky to- toc toe tok too tor tos tot toy trc tre trk tro trr trs trt try tsc tse tsk tso tsr tss tst tsy ttc tte ttk tto ttr tts ttt tty tyc tye tyo tyr tys tyt ycc yce yco ycs ycy yec yee yek yeo yer yes yet yey ykk yoc yoe yok yoo yor yos yot yoy yrc yre yro yrs yrt ysc yse ysk yso ysr yss yst ysy ytc yte ytk yto ytr yts ytt yyc yye yys yyt yyy