a-a a-c aaa aac aag aao aap aas ac- aca acc acg aco acp acs ag- aga agc agg ago agp ags aoa aoc aog aoo aop aos ap- apa apc apg apo app aps as- asa asc asg aso asp ass c-- caa cac cag cao cap cas cca ccc ccg cco ccp ccs cga cgc cgg cgo cgp cgs co- coa coc cog coo cop cos cpa cpc cpg cpo cpp cps csa csc csg cso csp css g-p gaa gac gag gao gap gas gca gcc gcg gco gcp gcs gga ggc ggg ggo ggp ggs goa goc gog goo gop gos gpa gpc gpg gpo gpp gps gsa gsc gsg gso gsp gss oaa oac oag oao oap oas oc- oca occ ocg oco ocp ocs oga ogc ogg ogo ogp ogs oo- ooa ooc oog ooo oop oos op- opa opc opg opo opp ops os- osa osc osg oso osp oss p-p paa pac pag pao pap pas pca pcc pcg pco pcp pcs pga pgc pgg pgo pgp pgs poa poc pog poo pop pos ppa ppc ppg ppo ppp pps ps- psa psc psg pso psp pss saa sac sag sao sap sas sca scc scg sco scp scs sga sgc sgg sgo sgp sgs soa soc sog soo sop sos spa spc spg spo spp sps ss- ssa ssc ssg sso ssp sss