peo pep per pes pgb pgc pge pgg pgh pgi pgl pgo pgp pgr pgs phb phc phe phg phi phl pho php phr phs pib pic pie pig pih pii pil pio pip pir pis plb plc ple plg plh pli pll plo plp plr pls pob poc poe pog poh poi pol poo pop por pos ppb ppc ppe ppg pph ppi ppl ppo ppp ppr pps prb prc pre prg prh pri prl pro prp prr prs ps- psb psc pse psg psh psi psl pso psp psr pss rbb rbc rbe rbg rbh rbi rbl rbo rbp rbr rbs rcb rcc rce rcg rch rci rcl rco rcp rcr rcs re- reb rec ree reg reh rei rel reo rep rer res rgb rgc rge rgg rgh rgi rgo rgp rgr rgs rh- rhb rhc rhe rhg rhh rhi rhl rho rhp rhr rhs rib ric rie rig rih rii ril rio rip rir ris rlc rle rlg rlh rli rll rlo rlp rlr rls rob roc roe rog roh roi rol roo rop ror ros rpb rpc rpe rpg rph rpi rpl rpo rpp rpr rps rrb rrc rrg rrh rri rrl rrp rrr rrs rsb rsc rse rsg rsh rsi rsl rso rsp rsr rss sbb sbc sbe sbg sbh sbi sbl sbo sbp sbr sbs scb scc sce scg sch sci scl sco scp scr scs se- seb sec see seg seh sei sel seo sep ser ses sgb sgc sge sgg sgh sgi sgl sgo sgp sgr sgs sh- shb shc she shg shh shi shl sho shp shr shs sib sic sie sig sih sii sil sio sip sir sis slb slc sle slg slh sli sll slo slp slr sls sob soc soe sog soh soi sol soo sop sor sos spb spc spe spg sph spi spl spo spp spr sps sr- srb src sre srg srh sri srl sro srp srr srs ss- ssb ssc sse ssg ssh ssi ssl sso ssp ssr sss