-er a-a a-c aaa aac aae aag aap aar aas ac- aca acc ace acg acp acr acs aea aec aee aeg aep aer aes ag- aga agc age agg agp agr ags ap- apa apc ape apg app apr aps ar- ara arc are arg arp arr ars as- asa asc ase asg asp asr ass c-- caa cac cae cag cap car cas cca ccc cce ccg ccp ccr ccs ce- cea cec cee ceg cep cer ces cga cgc cge cgg cgp cgr cgs cpa cpc cpe cpg cpp cpr cps cra crc cre crg crp crr crs csa csc cse csg csp csr css eaa eac eae eag eap ear eas ec- eca ecc ece ecg ecr ecs eea eec eee eeg eep eer ees ega egc ege egg egp egr egs ep- epa epc epe epg epp epr eps era erc ere erg erp err ers es- esa esc ese esg esp esr ess g-p gaa gac gae gag gap gar gas gca gcc gce gcg gcp gcr gcs ge- gea gec gee geg gep ger ges gga ggc ggg ggp ggr ggs gpa gpc gpe gpg gpp gpr gps gra grc gre grg grp grr grs gsa gsc gse gsg gsp gsr gss p-p paa pac pae pag pap par pas pca pcc pce pcg pcp pcr pcs pea pec pee peg pep per pes pga pgc pge pgg pgp pgr pgs ppa ppc ppe ppg ppp ppr pps pra prc pre prg prp prr prs ps- psa psc pse psg psp psr pss ra- raa rac rae rag rap rar ras rca rcc rce rcg rcp rcr rcs re- rea rec ree reg rep rer res rga rgc rge rgg rgp rgr rgs rpa rpc rpe rpg rpp rpr rps rra rrc rrg rrp rrr rrs rsa rsc rse rsg rsp rsr rss saa sac sae sag sap sar sas sca scc sce scg scp scr scs se- sea sec see seg sep ser ses sga sgc sge sgg sgp sgr sgs spa spc spe spg spp spr sps sr- sra src sre srg srp srr srs ss- ssa ssc sse ssg ssp ssr sss