a-a a-c aaa aac aaf aag aap ac- aca acc acf acg acp af- afa afc aff afg afp ag- aga agc agf agg agp ap- apa apc apf apg app c-- caa cac caf cag cap cca ccc ccf ccg ccp cfa cfc cff cfg cfp cga cgc cgg cgp cpa cpc cpf cpg cpp faa fac faf fag fap fca fcc fcf fcg fcp ffa ffc fff ffg ffp fga fgc fgf fgg fgp fpa fpc fpg fpp g-p gaa gac gaf gag gap gca gcc gcf gcg gcp gfa gfc gff gfp gga ggc ggg ggp gpa gpc gpf gpg gpp p-p paa pac paf pag pap pca pcc pcf pcg pcp pfa pfc pff pfg pfp pga pgc pgf pgg pgp ppa ppc ppf ppg ppp