-er c-- ccc cce ccg cck cco ccr ccu ce- cec cee ceg cek ceo cer ceu cgc cge cgg cgo cgr cgu ckc cko co- coc coe cog cok coo cor cou crc cre crg crk cro crr cru cuc cue cug cuk cuo cur cuu ec- ecc ece ecg eck eco ecr ecu eec eee eeg eek eeo eer egc ege egg ego egr egu ekc eke ekg eko ekr eku eo- eoc eoe eog eok eoo eor eou erc ere erg erk ero err eru eu- euc eue eug eur gcc gce gcg gck gco gcr gcu ge- gec gee geg gek geo ger geu ggc ggg ggo ggr ggu gko goc goe gog gok goo gor gou grc gre grg grk gro grr gru gu- guc gue gug guk guo gur guu kcc kce kcg kck kcr kcu ke- kec kee keg kek keo ker kgc kgo kgu kkc kke kkk kkr kku koc koe kog kok koo kor kou krc krg krk kro krr kru kuc kue kug kuk kur kuu oc- occ ocg ock oco ocr ocu oec oee oeg oeo oer ogc oge ogg ogo okc oke okg okk oko okr oku oo- ooc oog ook ooo oor or- orc ore org ork oro orr oru ou- ouc oue ouk ouo our rcc rce rcg rco rcr rcu re- rec ree reg rek reo rer reu rgc rge rgg rgk rgo rgr rkc rke rkg rkk rko rku roc roe rog rok roo ror rou rrc rrg rrk rrr rru ruc rue rug ruk ruo rur ruu ucc uce ucg uck uco ucr ucu uec uee ueg uer ugc uge ugg ugk ugo ugr ugu ukc uke ukk ukr uku uoc uoe uog uok uoo uor ur- urc ure urg urk uro urr uru uuc uue uug uur uuu