pn- pna pne pnf png pni pnk pnn pno pnp pnr pns poa poe pof pog poi pok pon poo pop por pos ppa ppe ppf ppg ppi ppk ppn ppo ppp ppr pps pra pre prf prg pri prk prn pro prp prr prs ps- psa pse psf psg psi psk psn pso psp psr pss ra- raa rae raf rag rai rak ran rao rap rar ras re- rea ree ref reg rei rek ren reo rep rer res rfa rfe rff rfg rfi rfk rfn rfo rfp rfr rfs rga rge rgf rgg rgi rgk rgn rgo rgp rgr rgs ria rie rif rig rii rik rin rio rip rir ris rke rkf rkg rkk rko rkp rks rna rng rni rnn rno rnp rnr rns roa roe rof rog roi rok ron roo rop ror ros rpa rpe rpf rpg rpi rpk rpn rpo rpp rpr rps rra rrf rrg rri rrk rrn rrp rrr rrs rsa rse rsf rsg rsi rsk rsn rso rsp rsr rss saa sae saf sag sai sak san sao sap sar sas se- sea see sef seg sei sek sen seo sep ser ses sfa sfe sff sfg sfi sfk sfn sfo sfp sfr sfs sga sge sgf sgg sgi sgk sgn sgo sgp sgr sgs sia sie sif sig sii sik sin sio sip sir sis sk- ska ske skf skg ski skk sko skp skr sks sna sne snf sng sni snk snn sno snp snr sns soa soe sof sog soi sok son soo sop sor sos spa spe spf spg spi spk spn spo spp spr sps sr- sra sre srf srg sri srk srn sro srp srr srs ss- ssa sse ssf ssg ssi ssk ssn sso ssp ssr sss