-er a-a a-c aaa aac aad aae aag aar aas ac- aca acc acd ace acg acr acs ad- ada adc add ade adg adr ads aea aec aed aee aeg aer aes ag- aga agc agd age agg agr ags ar- ara arc ard are arg arr ars as- asa asc asd ase asg asr ass c-- caa cac cad cae cag car cas cca ccc ccd cce ccg ccr ccs cda cdc cdd cde cdg cdr cds ce- cea cec ced cee ceg cer ces cga cgc cgd cge cgg cgr cgs cra crc crd cre crg crr crs csa csc csd cse csg csr css daa dac dad dae dag dar das dca dcc dcd dce dcg dcr dcs dda ddc ddd dde ddg ddr dds de- dea dec ded dee deg der des dga dgc dgd dge dgg dgr dgs dra drc drd dre drg drr drs dsa dsc dsd dse dsg dsr dss eaa eac ead eae eag ear eas ec- eca ecc ecd ece ecg ecr ecs ed- eda edc edd ede edg edr eds eea eec eed eee eeg eer ees ega egc egd ege egg egr egs era erc erd ere erg err ers es- esa esc esd ese esg esr ess g-d gaa gac gad gae gag gar gas gca gcc gcd gce gcg gcr gcs gda gdc gdd gde gdr gds ge- gea gec ged gee geg ger ges gga ggc ggd ggg ggr ggs gra grc grd gre grg grr grs gsa gsc gsd gse gsg gsr gss ra- raa rac rad rae rag rar ras rca rcc rcd rce rcg rcr rcs rda rdc rdd rde rdg rdr rds re- rea rec red ree reg rer res rga rgc rgd rge rgg rgr rgs rra rrc rrd rrg rrr rrs rsa rsc rsd rse rsg rsr rss saa sac sad sae sag sar sas sca scc scd sce scg scr scs sda sdc sdd sde sdg sdr sds se- sea sec sed see seg ser ses sga sgc sgd sge sgg sgr sgs sr- sra src srd sre srg srr srs ss- ssa ssc ssd sse ssg ssr sss