a-a a-c a-z aaa aac aag aao aas aaz ac- aca acc acg aco acs acz ag- aga agc agg ago ags agz aoa aoc aog aoo aos as- asa asc asg aso ass asz az- aza azg azo azs azz c-- caa cac cag cao cas caz cca ccc ccg cco ccs ccz cga cgc cgg cgo cgs co- coa coc cog coo cos coz csa csc csg cso css csz cz- czc czo gaa gac gag gao gas gaz gca gcc gcg gco gcs gga ggc ggg ggo ggs ggz goa goc gog goo gos goz gsa gsc gsg gso gss gza gzo oaa oac oag oao oas oc- oca occ ocg oco ocs ocz oga ogc ogg ogo ogs oo- ooa ooc oog ooo oos os- osa osc osg oso oss oza ozo ozs ozz saa sac sag sao sas saz sca scc scg sco scs sga sgc sgg sgo sgs soa soc sog soo sos soz ss- ssa ssc ssg sso sss ssz sza z-g zaa zac zag zao zas zaz zco zcs zgg zgs zo- zoa zoc zog zoo zos zsa zsg zsz zzs zzz