-er c-- ccc cce cck cco ccr ccs ccu ccv ce- cec cee cek ceo cer ces ceu cev ckc cko cks co- coc coe cok coo cor cos cou cov crc cre crk cro crr crs cru crv csc cse csk cso csr css csu csv cuc cue cuk cuo cur cus cuu cuv cvc cve cvk cvo cvr cvs cvu cvv ec- ecc ece eck eco ecr ecs ecu ecv eec eee eek eeo eer ees eev ekc eke eko ekr eks eku ekv eo- eoc eoe eok eoo eor eos eou erc ere erk ero err ers eru erv es- esc ese esk eso esr ess esu esv eu- euc eue eur eus euv evc eve evo evr evs evv kcc kce kck kcr kcs kcu ke- kec kee kek keo ker kes kev kkc kke kkk kkr kks kku kkv koc koe kok koo kor kos kou krc krk kro krr krs kru krv ksc kse ksk kso ksr kss ksu ksv kuc kue kuk kur kus kuu kvk kvo kvr kvs kvv oc- occ ock oco ocr ocs ocu ocv oec oee oeo oer oes okc oke okk oko okr oks oku oo- ooc ook ooo oor oos oov or- orc ore ork oro orr ors oru orv os- osc ose osk oso osr oss osu osv ou- ouc oue ouk ouo our ous ov- ovc ove ovo ovs ovv rcc rce rco rcr rcs rcu rcv re- rec ree rek reo rer res reu rev rkc rke rkk rko rks rku rkv roc roe rok roo ror ros rou rov rrc rrk rrr rrs rru rsc rse rsk rso rsr rss rsu rsv ruc rue ruk ruo rur rus ruu ruv rvc rve rvo rvr rvs rvu rvv scc sce sck sco scr scs scu scv se- sec see sek seo ser ses seu sev sk- skc ske skk sko skr sks sku soc soe sok soo sor sos sou sov sr- src sre srk sro srr srs srv ss- ssc sse ssk sso ssr sss ssu ssv suc sue suk suo sur sus suu suv svc sve svk svo svr svs svu svv ucc uce uck uco ucr ucs ucu ucv uec uee uer ues ukc uke ukk ukr uku uoc uoe uok uoo uor uos ur- urc ure urk uro urr urs uru usc use usk uso usr uss usu usv uuc uue uur uus uuu uvc uve uvo uvs uvu uvv v-e vcc vce vco vcr vcs vcu vec vee vek veo ver ves veu voc voe vok voo vor vos vou vov vrc vre vrk vrr vrs vru vsc vse vsk vso vsr vss vsu vsv vue vuk vur vus vuv vvc vvo vvr vvs vvv