a-a a-c aaa aac aae aaf aag aas ac- aca acc ace acf acg acs aea aec aee aef aeg aes af- afa afc afe aff afg afs ag- aga agc age agf agg ags as- asa asc ase asf asg ass c-- caa cac cae caf cag cas cca ccc cce ccf ccg ccs ce- cea cec cee cef ceg ces cfa cfc cfe cff cfg cfs cga cgc cge cgg cgs csa csc cse csf csg css eaa eac eae eaf eag eas ec- eca ecc ece ecf ecg ecs eea eec eee eef eeg ees ef- efa efc efe eff efg efs ega egc ege egf egg egs es- esa esc ese esf esg ess faa fac fae faf fag fas fca fcc fce fcf fcg fcs fea fec fee fef feg fes ffa ffc ffe fff ffg ffs fga fgc fge fgf fgg fgs fsa fsc fse fsf fsg fss gaa gac gae gaf gag gas gca gcc gce gcf gcg gcs ge- gea gec gee gef geg ges gfa gfc gfe gff gfs gga ggc ggg ggs gsa gsc gse gsf gsg gss saa sac sae saf sag sas sca scc sce scf scg scs se- sea sec see sef seg ses sfa sfc sfe sff sfg sfs sga sgc sge sgf sgg sgs ss- ssa ssc sse ssf ssg sss