-er -ey c-- ccc cce cck cco ccr ccs ccu ce- cec cee cek ceo cer ces ceu cey ckc cko cks cky co- coc coe cok coo cor cos cou coy crc cre crk cro crr crs cru cry csc cse csk cso csr css csu csy cuc cue cuk cuo cur cus cuu cuy cyc cye cyk cyo cyr cys ec- ecc ece eck eco ecr ecs ecu eec eee eek eeo eer ees eey ekc eke eko ekr eks eku eky eo- eoc eoe eok eoo eor eos eou erc ere erk ero err ers eru ery es- esc ese esk eso esr ess esu esy eu- euc eue eur eus eyc eye eyo eyr eys kcc kce kck kcr kcs kcu ke- kec kee kek keo ker kes key kkc kke kkk kkr kks kku kky koc koe kok koo kor kos kou koy krc krk kro krr krs kru kry ksc kse ksk kso ksr kss ksu kuc kue kuk kur kus kuu kuy kyc kye kyo kyr kys kyu oc- occ ock oco ocr ocs ocu oec oee oeo oer oes oey okc oke okk oko okr oks oku oo- ooc ook ooo oor oos or- orc ore ork oro orr ors oru ory os- osc ose osk oso osr oss osu ou- ouc oue ouk ouo our ous oye oyo oys rcc rce rco rcr rcs rcu re- rec ree rek reo rer res reu rey rkc rke rkk rko rks rku rky roc roe rok roo ror ros rou roy rrc rrk rrr rrs rru rsc rse rsk rso rsr rss rsu ruc rue ruk ruo rur rus ruu ruy ry- ryc rye ryk ryo ryr rys ryu ryy scc sce sck sco scr scs scu se- sec see sek seo ser ses seu sey sk- skc ske skk sko skr sks sku sky soc soe sok soo sor sos sou soy sr- src sre srk sro srr srs sry ss- ssc sse ssk sso ssr sss ssu suc sue suk suo sur sus suu suy sy- syc sye syk syr sys syu ucc uce uck uco ucr ucs ucu uec uee uer ues uey ukc uke ukk ukr uku uoc uoe uok uoo uor uos ur- urc ure urk uro urr urs uru ury usc use usk uso usr uss usu uuc uue uur uus uuu uyc uyo uys uyu ycc yce yco ycs ycu ycy yec yee yek yeo yer yes yey ykk yoc yoe yok yoo yor yos you yoy yrc yre yro yrs yru ysc yse ysk yso ysr yss ysu ysy yue yuk yuo yur yus yuu yuy yyc yye yys yyu yyy