-er c-- ccc cce ccg ccr ccs ccu ce- cec cee ceg cer ces ceu cgc cge cgg cgr cgs cgu crc cre crg crr crs cru csc cse csg csr css csu cuc cue cug cur cus cuu ec- ecc ece ecg ecr ecs ecu eec eee eeg eer ees egc ege egg egr egs egu erc ere erg err ers eru es- esc ese esg esr ess esu eu- euc eue eug eur eus gcc gce gcg gcr gcs gcu ge- gec gee geg ger ges geu ggc ggg ggr ggs ggu grc gre grg grr grs gru gsc gse gsg gsr gss gsu gu- guc gue gug gur gus guu rcc rce rcg rcr rcs rcu re- rec ree reg rer res reu rgc rge rgg rgr rgs rrc rrg rrr rrs rru rsc rse rsg rsr rss rsu ruc rue rug rur rus ruu scc sce scg scr scs scu se- sec see seg ser ses seu sgc sge sgg sgr sgs sgu sr- src sre srg srr srs ss- ssc sse ssg ssr sss ssu suc sue sug sur sus suu ucc uce ucg ucr ucs ucu uec uee ueg uer ues ugc uge ugg ugr ugs ugu ur- urc ure urg urr urs uru usc use usg usr uss usu uuc uue uug uur uus uuu