-er c-- ccc cce cck cco ccr ccs cct ccu ce- cec cee cek ceo cer ces cet ceu ckc cko cks ckt co- coc coe cok coo cor cos cot cou crc cre crk cro crr crs crt cru csc cse csk cso csr css cst csu ctc cte ctk cto ctr cts ctt ctu cuc cue cuk cuo cur cus cut cuu ec- ecc ece eck eco ecr ecs ect ecu eec eee eek eeo eer ees eet ekc eke eko ekr eks ekt eku eo- eoc eoe eok eoo eor eos eot eou erc ere erk ero err ers ert eru es- esc ese esk eso esr ess est esu etc ete etk eto etr ets ett etu eu- euc eue eur eus eut k-t kcc kce kck kcr kcs kct kcu ke- kec kee kek keo ker kes ket kkc kke kkk kkr kks kkt kku koc koe kok koo kor kos kot kou krc krk kro krr krs krt kru ksc kse ksk kso ksr kss kst ksu ktc kte ktk kto ktr kts ktt ktu kuc kue kuk kur kus kut kuu oc- occ ock oco ocr ocs oct ocu oec oee oeo oer oes oet okc oke okk oko okr oks oku oo- ooc ook ooo oor oos oot or- orc ore ork oro orr ors ort oru os- osc ose osk oso osr oss ost osu ot- otc ote otk oto otr ots ott otu ou- ouc oue ouk ouo our ous out rcc rce rco rcr rcs rct rcu re- rec ree rek reo rer res ret reu rkc rke rkk rko rks rkt rku roc roe rok roo ror ros rot rou rrc rrk rrr rrs rrt rru rsc rse rsk rso rsr rss rst rsu rtc rte rtk rto rtr rts rtt rtu ruc rue ruk ruo rur rus rut ruu scc sce sck sco scr scs sct scu se- sec see sek seo ser ses set seu sk- skc ske skk sko skr sks skt sku soc soe sok soo sor sos sot sou sr- src sre srk sro srr srs srt ss- ssc sse ssk sso ssr sss sst ssu stc ste stk sto str sts stt stu suc sue suk suo sur sus sut suu tcc tce tck tco tcr tcs tct tcu te- tec tee tek teo ter tes tet teu tkc tke tkk tko tkr tks tkt to- toc toe tok too tor tos tot tou trc tre trk tro trr trs trt tru tsc tse tsk tso tsr tss tst tsu ttc tte ttk tto ttr tts ttt ttu tuc tue tuk tuo tur tus tut tuu ucc uce uck uco ucr ucs uct ucu uec uee uer ues uet ukc uke ukk ukr uku uoc uoe uok uoo uor uos uot ur- urc ure urk uro urr urs urt uru usc use usk uso usr uss ust usu utc ute utk uto utr uts utt utu uuc uue uur uus uut uuu