-er c-- ccc cce ccg cco ccr ccu ce- cec cee ceg ceo cer ceu cgc cge cgg cgo cgr cgu co- coc coe cog coo cor cou crc cre crg cro crr cru cuc cue cug cuo cur cuu ec- ecc ece ecg eco ecr ecu eec eee eeg eeo eer egc ege egg ego egr egu eo- eoc eoe eog eoo eor eou erc ere erg ero err eru eu- euc eue eug eur gcc gce gcg gco gcr gcu ge- gec gee geg geo ger geu ggc ggg ggo ggr ggu goc goe gog goo gor gou grc gre grg gro grr gru gu- guc gue gug guo gur guu oc- occ ocg oco ocr ocu oec oee oeg oeo oer ogc oge ogg ogo oo- ooc oog ooo oor or- orc ore org oro orr oru ou- ouc oue ouo our rcc rce rcg rco rcr rcu re- rec ree reg reo rer reu rgc rge rgg rgo rgr roc roe rog roo ror rou rrc rrg rrr rru ruc rue rug ruo rur ruu ucc uce ucg uco ucr ucu uec uee ueg uer ugc uge ugg ugo ugr ugu uoc uoe uog uoo uor ur- urc ure urg uro urr uru uuc uue uug uur uuu