g-p ggg ggo ggp ggr ggs gog goo gop gor gos gpg gpo gpp gpr gps grg gro grp grr grs gsg gso gsp gsr gss ogg ogo ogp ogs oo- oog ooo oop oor oos op- opg opo opp opr ops or- org oro orp orr ors os- osg oso osp osr oss p-p pgg pgo pgp pgr pgs pog poo pop por pos ppg ppo ppp ppr pps prg pro prp prr prs ps- psg pso psp psr pss rgg rgo rgp rgr rgs rog roo rop ror ros rpg rpo rpp rpr rps rrg rrp rrr rrs rsg rso rsp rsr rss sgg sgo sgp sgr sgs sog soo sop sor sos spg spo spp spr sps sr- srg sro srp srr srs ss- ssg sso ssp ssr sss