-er a-a a-c aaa aac aae aag aah aao aar ac- aca acc ace acg ach aco acr aea aec aee aeg aeh aeo aer ag- aga agc age agg agh ago agr aha ahc ahe ahg ahh aho ahr aoa aoc aoe aog aoh aoo aor ar- ara arc are arg arh aro arr c-- caa cac cae cag cah cao car cca ccc cce ccg cch cco ccr ce- cea cec cee ceg ceh ceo cer cga cgc cge cgg cgh cgo cgr ch- cha chc che chg chh cho chr co- coa coc coe cog coh coo cor cra crc cre crg crh cro crr eaa eac eae eag eah eao ear ec- eca ecc ece ecg ech eco ecr eea eec eee eeg eeo eer ega egc ege egg egh ego egr eha ehc ehe ehg ehh eho ehr eo- eoa eoc eoe eog eoh eoo eor era erc ere erg erh ero err gaa gac gae gag gah gao gar gca gcc gce gcg gch gco gcr ge- gea gec gee geg geh geo ger gga ggc ggg ggh ggo ggr gha ghc ghe ghg ghh gho ghr goa goc goe gog goh goo gor gra grc gre grg grh gro grr haa hac hae hag hah hao har hca hcc hce hcg hch hco hcr he- hea hec hee heg heh heo her hga hgc hge hgg hgh hgo hgr hha hhc hhe hhg hhh hho hhr hoa hoc hoe hog hoh hoo hor hr- hra hrc hre hrg hrh hro hrr oaa oac oae oag oah oao oar oc- oca occ ocg och oco ocr oea oec oee oeg oeh oeo oer oga ogc oge ogg ogh ogo oha ohc ohe ohg ohh oho ohr oo- ooa ooc oog ooh ooo oor or- ora orc ore org orh oro orr ra- raa rac rae rag rah rao rar rca rcc rce rcg rch rco rcr re- rea rec ree reg reh reo rer rga rgc rge rgg rgh rgo rgr rh- rha rhc rhe rhg rhh rho rhr roa roc roe rog roh roo ror rra rrc rrg rrh rrr