-er a-a a-c aaa aac aae aag aao aar aas aau ac- aca acc ace acg aco acr acs acu aea aec aee aeg aeo aer aes aeu ag- aga agc age agg ago agr ags agu aoa aoc aoe aog aoo aor aos aou ar- ara arc are arg aro arr ars aru as- asa asc ase asg aso asr ass asu au- aua auc aue aug auo aur aus c-- caa cac cae cag cao car cas cau cca ccc cce ccg cco ccr ccs ccu ce- cea cec cee ceg ceo cer ces ceu cga cgc cge cgg cgo cgr cgs cgu co- coa coc coe cog coo cor cos cou cra crc cre crg cro crr crs cru csa csc cse csg cso csr css csu cua cuc cue cug cuo cur cus cuu eaa eac eae eag eao ear eas eau ec- eca ecc ece ecg eco ecr ecs ecu eea eec eee eeg eeo eer ees ega egc ege egg ego egr egs egu eo- eoa eoc eoe eog eoo eor eos eou era erc ere erg ero err ers eru es- esa esc ese esg eso esr ess esu eu- eua euc eue eug eur eus gaa gac gae gag gao gar gas gau gca gcc gce gcg gco gcr gcs gcu ge- gea gec gee geg geo ger ges geu gga ggc ggg ggo ggr ggs ggu goa goc goe gog goo gor gos gou gra grc gre grg gro grr grs gru gsa gsc gse gsg gso gsr gss gsu gu- gua guc gue gug guo gur gus guu oaa oac oae oag oao oar oas oau oc- oca occ ocg oco ocr ocs ocu oea oec oee oeg oeo oer oes oga ogc oge ogg ogo ogs oo- ooa ooc oog ooo oor oos or- ora orc ore org oro orr ors oru os- osa osc ose osg oso osr oss osu ou- oua ouc oue ouo our ous ra- raa rac rae rag rao rar ras rau rca rcc rce rcg rco rcr rcs rcu re- rea rec ree reg reo rer res reu rga rgc rge rgg rgo rgr rgs roa roc roe rog roo ror ros rou rra rrc rrg rrr rrs rru rsa rsc rse rsg rso rsr rss rsu rua ruc rue rug ruo rur rus ruu saa sac sae sag sao sar sas sau sca scc sce scg sco scr scs scu se- sea sec see seg seo ser ses seu sga sgc sge sgg sgo sgr sgs sgu soa soc soe sog soo sor sos sou sr- sra src sre srg sro srr srs ss- ssa ssc sse ssg sso ssr sss ssu sua suc sue sug suo sur sus suu ua- uaa uac uae uag uao uar uas uau uca ucc uce ucg uco ucr ucs ucu uea uec uee ueg uer ues uga ugc uge ugg ugo ugr ugs ugu uoa uoc uoe uog uoo uor uos ur- ura urc ure urg uro urr urs uru usa usc use usg uso usr uss usu uua uuc uue uug uur uus uuu