-er c-- ccc cce cck cco ccr cct ccu ce- cec cee cek ceo cer cet ceu ckc cko ckt co- coc coe cok coo cor cot cou crc cre crk cro crr crt cru ctc cte ctk cto ctr ctt ctu cuc cue cuk cuo cur cut cuu ec- ecc ece eck eco ecr ect ecu eec eee eek eeo eer eet ekc eke eko ekr ekt eku eo- eoc eoe eok eoo eor eot eou erc ere erk ero err ert eru etc ete etk eto etr ett etu eu- euc eue eur eut k-t kcc kce kck kcr kct kcu ke- kec kee kek keo ker ket kkc kke kkk kkr kkt kku koc koe kok koo kor kot kou krc krk kro krr krt kru ktc kte ktk kto ktr ktt ktu kuc kue kuk kur kut kuu oc- occ ock oco ocr oct ocu oec oee oeo oer oet okc oke okk oko okr oku oo- ooc ook ooo oor oot or- orc ore ork oro orr ort oru ot- otc ote otk oto otr ott otu ou- ouc oue ouk ouo our out rcc rce rco rcr rct rcu re- rec ree rek reo rer ret reu rkc rke rkk rko rkt rku roc roe rok roo ror rot rou rrc rrk rrr rrt rru rtc rte rtk rto rtr rtt rtu ruc rue ruk ruo rur rut ruu tcc tce tck tco tcr tct tcu te- tec tee tek teo ter tet teu tkc tke tkk tko tkr tkt to- toc toe tok too tor tot tou trc tre trk tro trr trt tru ttc tte ttk tto ttr ttt ttu tuc tue tuk tuo tur tut tuu ucc uce uck uco ucr uct ucu uec uee uer uet ukc uke ukk ukr uku uoc uoe uok uoo uor uot ur- urc ure urk uro urr urt uru utc ute utk uto utr utt utu uuc uue uur uut uuu