-up g-p ggg ggp ggr ggs ggu gpg gpp gpr gps gpu grg grp grr grs gru gsg gsp gsr gss gsu gu- gug gup gur gus guu p-p pgg pgp pgr pgs ppg ppp ppr pps ppu prg prp prr prs pru ps- psg psp psr pss psu pug pup pur pus puu rgg rgp rgr rgs rpg rpp rpr rps rpu rrg rrp rrr rrs rru rsg rsp rsr rss rsu rug rup rur rus ruu sgg sgp sgr sgs sgu spg spp spr sps spu sr- srg srp srr srs ss- ssg ssp ssr sss ssu sug sup sur sus suu ugg ugp ugr ugs ugu up- upg upp upr ups upu ur- urg urp urr urs uru usg usp usr uss usu uug uur uus uuu