a-a a-c aaa aac aag aao aap aar aas ac- aca acc acg aco acp acr acs ag- aga agc agg ago agp agr ags aoa aoc aog aoo aop aor aos ap- apa apc apg apo app apr aps ar- ara arc arg aro arp arr ars as- asa asc asg aso asp asr ass c-- caa cac cag cao cap car cas cca ccc ccg cco ccp ccr ccs cga cgc cgg cgo cgp cgr cgs co- coa coc cog coo cop cor cos cpa cpc cpg cpo cpp cpr cps cra crc crg cro crp crr crs csa csc csg cso csp csr css g-p gaa gac gag gao gap gar gas gca gcc gcg gco gcp gcr gcs gga ggc ggg ggo ggp ggr ggs goa goc gog goo gop gor gos gpa gpc gpg gpo gpp gpr gps gra grc grg gro grp grr grs gsa gsc gsg gso gsp gsr gss oaa oac oag oao oap oar oas oc- oca occ ocg oco ocp ocr ocs oga ogc ogg ogo ogp ogs oo- ooa ooc oog ooo oop oor oos op- opa opc opg opo opp opr ops or- ora orc org oro orp orr ors os- osa osc osg oso osp osr oss p-p paa pac pag pao pap par pas pca pcc pcg pco pcp pcr pcs pga pgc pgg pgo pgp pgr pgs poa poc pog poo pop por pos ppa ppc ppg ppo ppp ppr pps pra prc prg pro prp prr prs ps- psa psc psg pso psp psr pss ra- raa rac rag rao rap rar ras rca rcc rcg rco rcp rcr rcs rga rgc rgg rgo rgp rgr rgs roa roc rog roo rop ror ros rpa rpc rpg rpo rpp rpr rps rra rrc rrg rrp rrr rrs rsa rsc rsg rso rsp rsr rss saa sac sag sao sap sar sas sca scc scg sco scp scr scs sga sgc sgg sgo sgp sgr sgs soa soc sog soo sop sor sos spa spc spg spo spp spr sps sr- sra src srg sro srp srr srs ss- ssa ssc ssg sso ssp ssr sss