-er -ey c-- ccc cce cck cco ccr cct ccv ce- cec cee cek ceo cer cet cev cey ckc cko ckt cky co- coc coe cok coo cor cot cov coy crc cre crk cro crr crt crv cry ctc cte ctk cto ctr ctt ctv cty cvc cve cvk cvo cvr cvt cvv cyc cye cyk cyo cyr cyt ec- ecc ece eck eco ecr ect ecv eec eee eek eeo eer eet eev eey ekc eke eko ekr ekt ekv eky eo- eoc eoe eok eoo eor eot erc ere erk ero err ert erv ery etc ete etk eto etr ett etv ety evc eve evo evr evt evv evy eyc eye eyo eyr eyt k-t kcc kce kck kcr kct ke- kec kee kek keo ker ket kev key kkc kke kkk kkr kkt kkv kky koc koe kok koo kor kot koy krc krk kro krr krt krv kry ktc kte ktk kto ktr ktt ktv kvk kvo kvr kvv kyc kye kyo kyr kyt oc- occ ock oco ocr oct ocv oec oee oeo oer oet oey okc oke okk oko okr oo- ooc ook ooo oor oot oov or- orc ore ork oro orr ort orv ory ot- otc ote otk oto otr ott otv ov- ovc ove ovo ovv oye oyo rcc rce rco rcr rct rcv re- rec ree rek reo rer ret rev rey rkc rke rkk rko rkt rkv rky roc roe rok roo ror rot rov roy rrc rrk rrr rrt rtc rte rtk rto rtr rtt rtv rty rvc rve rvo rvr rvt rvv rvy ry- ryc rye ryk ryo ryr ryy tcc tce tck tco tcr tct tcv te- tec tee tek teo ter tet tev tey tkc tke tkk tko tkr tkt tky to- toc toe tok too tor tot tov toy trc tre trk tro trr trt trv try ttc tte ttk tto ttr ttt ttv tty tvc tve tvk tvo tvr tvt tvy tyc tye tyo tyr tyt v-e vcc vce vco vcr vct vcy vec vee vek veo ver vet vey vkt voc voe vok voo vor vot vov voy vrc vre vrk vrr vrt vry vtc vte vtk vto vtr vtt vtv vty vvc vvo vvr vvt vvv vye vyt ycc yce yco ycv ycy yec yee yek yeo yer yet yev yey ykk yoc yoe yok yoo yor yot yoy yrc yre yro yrt ytc yte ytk yto ytr ytt ytv yve yvo yvr yvy yyc yye yyt yyy