-er a-a a-c aaa aac aae aag aar aas aau ac- aca acc ace acg acr acs acu aea aec aee aeg aer aes aeu ag- aga agc age agg agr ags agu ar- ara arc are arg arr ars aru as- asa asc ase asg asr ass asu au- aua auc aue aug aur aus c-- caa cac cae cag car cas cau cca ccc cce ccg ccr ccs ccu ce- cea cec cee ceg cer ces ceu cga cgc cge cgg cgr cgs cgu cra crc cre crg crr crs cru csa csc cse csg csr css csu cua cuc cue cug cur cus cuu eaa eac eae eag ear eas eau ec- eca ecc ece ecg ecr ecs ecu eea eec eee eeg eer ees ega egc ege egg egr egs egu era erc ere erg err ers eru es- esa esc ese esg esr ess esu eu- eua euc eue eug eur eus gaa gac gae gag gar gas gau gca gcc gce gcg gcr gcs gcu ge- gea gec gee geg ger ges geu gga ggc ggg ggr ggs ggu gra grc gre grg grr grs gru gsa gsc gse gsg gsr gss gsu gu- gua guc gue gug gur gus guu ra- raa rac rae rag rar ras rau rca rcc rce rcg rcr rcs rcu re- rea rec ree reg rer res reu rga rgc rge rgg rgr rgs rra rrc rrg rrr rrs rru rsa rsc rse rsg rsr rss rsu rua ruc rue rug rur rus ruu saa sac sae sag sar sas sau sca scc sce scg scr scs scu se- sea sec see seg ser ses seu sga sgc sge sgg sgr sgs sgu sr- sra src sre srg srr srs ss- ssa ssc sse ssg ssr sss ssu sua suc sue sug sur sus suu ua- uaa uac uae uag uar uas uau uca ucc uce ucg ucr ucs ucu uea uec uee ueg uer ues uga ugc uge ugg ugr ugs ugu ur- ura urc ure urg urr urs uru usa usc use usg usr uss usu uua uuc uue uug uur uus uuu