pcs pdc pdd pde pdg pdi pdl pdm pdo pdp pdr pds pec ped pee peg pei pel pem peo pep per pes pgc pgd pge pgg pgi pgl pgm pgo pgp pgr pgs pic pid pie pig pii pil pim pio pip pir pis plc pld ple plg pli pll plm plo plp plr pls pmc pmd pme pmg pmi pml pmm pmo pmp pmr pms poc pod poe pog poi pol pom poo pop por pos ppc ppd ppe ppg ppi ppl ppm ppo ppp ppr pps prc prd pre prg pri prl prm pro prp prr prs ps- psc psd pse psg psi psl psm pso psp psr pss rcc rcd rce rcg rci rcl rcm rco rcp rcr rcs rdc rdd rde rdg rdi rdl rdm rdo rdp rdr rds re- rec red ree reg rei rel rem reo rep rer res rgc rgd rge rgg rgi rgo rgp rgr rgs ric rid rie rig rii ril rim rio rip rir ris rlc rld rle rlg rli rll rlm rlo rlp rlr rls rmc rmd rme rmg rmi rml rmm rmo rmp rmr rms roc rod roe rog roi rol rom roo rop ror ros rpc rpd rpe rpg rpi rpl rpm rpo rpp rpr rps rrc rrd rrg rri rrl rrm rrp rrr rrs rsc rsd rse rsg rsi rsl rsm rso rsp rsr rss scc scd sce scg sci scl scm sco scp scr scs sdc sdd sde sdg sdi sdl sdm sdo sdp sdr sds se- sec sed see seg sei sel sem seo sep ser ses sgc sgd sge sgg sgi sgl sgm sgo sgp sgr sgs sic sid sie sig sii sil sim sio sip sir sis slc sld sle slg sli sll slm slo slp slr sls smc smd sme smg smi sml smm smo smp smr sms soc sod soe sog soi sol som soo sop sor sos spc spd spe spg spi spl spm spo spp spr sps sr- src srd sre srg sri srl srm sro srp srr srs ss- ssc ssd sse ssg ssi ssl ssm sso ssp ssr sss