-er a-a a-c aaa aac aae aag aao aar aau ac- aca acc ace acg aco acr acu aea aec aee aeg aeo aer aeu ag- aga agc age agg ago agr agu aoa aoc aoe aog aoo aor aou ar- ara arc are arg aro arr aru au- aua auc aue aug auo aur c-- caa cac cae cag cao car cau cca ccc cce ccg cco ccr ccu ce- cea cec cee ceg ceo cer ceu cga cgc cge cgg cgo cgr cgu co- coa coc coe cog coo cor cou cra crc cre crg cro crr cru cua cuc cue cug cuo cur cuu eaa eac eae eag eao ear eau ec- eca ecc ece ecg eco ecr ecu eea eec eee eeg eeo eer ega egc ege egg ego egr egu eo- eoa eoc eoe eog eoo eor eou era erc ere erg ero err eru eu- eua euc eue eug eur gaa gac gae gag gao gar gau gca gcc gce gcg gco gcr gcu ge- gea gec gee geg geo ger geu gga ggc ggg ggo ggr ggu goa goc goe gog goo gor gou gra grc gre grg gro grr gru gu- gua guc gue gug guo gur guu oaa oac oae oag oao oar oau oc- oca occ ocg oco ocr ocu oea oec oee oeg oeo oer oga ogc oge ogg ogo oo- ooa ooc oog ooo oor or- ora orc ore org oro orr oru ou- oua ouc oue ouo our ra- raa rac rae rag rao rar rau rca rcc rce rcg rco rcr rcu re- rea rec ree reg reo rer reu rga rgc rge rgg rgo rgr roa roc roe rog roo ror rou rra rrc rrg rrr rru rua ruc rue rug ruo rur ruu ua- uaa uac uae uag uao uar uau uca ucc uce ucg uco ucr ucu uea uec uee ueg uer uga ugc uge ugg ugo ugr ugu uoa uoc uoe uog uoo uor ur- ura urc ure urg uro urr uru uua uuc uue uug uur uuu