a-a a-c a-z aaa aac aae aag aas aaz ac- aca acc ace acg acs acz aea aec aee aeg aes aez ag- aga agc age agg ags agz as- asa asc ase asg ass asz az- aza aze azg azs azz c-- caa cac cae cag cas caz cca ccc cce ccg ccs ccz ce- cea cec cee ceg ces cez cga cgc cge cgg cgs csa csc cse csg css csz cz- czc cze eaa eac eae eag eas eaz ec- eca ecc ece ecg ecs eea eec eee eeg ees ega egc ege egg egs es- esa esc ese esg ess eze ezs ezz gaa gac gae gag gas gaz gca gcc gce gcg gcs ge- gea gec gee geg ges gez gga ggc ggg ggs ggz gsa gsc gse gsg gss gza saa sac sae sag sas saz sca scc sce scg scs se- sea sec see seg ses sez sga sgc sge sgg sgs ss- ssa ssc sse ssg sss ssz sza sze z-g zaa zac zag zas zaz zce zcs zea zec zee zes zez zgg zgs zsa zse zsg zsz zzs zzz