ppp ppr pps pra prd pre prf prl prn pro prp prr prs ps- psa psd pse psf psj psl psn pso psp psr pss ra- raa rad rae raf raj ral ran rao rap rar ras rda rdd rde rdf rdj rdl rdn rdo rdp rdr rds re- rea red ree ref rel ren reo rep rer res rfa rfd rfe rff rfj rfl rfn rfo rfp rfr rfs rja rjf rjp rjr rla rld rle rlf rll rln rlo rlp rlr rls rna rnd rnn rno rnp rnr rns roa rod roe rof roj rol ron roo rop ror ros rpa rpd rpe rpf rpl rpn rpo rpp rpr rps rra rrd rrf rrl rrn rrp rrr rrs rsa rsd rse rsf rsj rsl rsn rso rsp rsr rss saa sad sae saf saj sal san sao sap sar sas sda sdd sde sdf sdj sdl sdn sdo sdp sdr sds se- sea sed see sef sej sel sen seo sep ser ses sfa sfd sfe sff sfj sfl sfn sfo sfp sfr sfs sja sjd sje sjf sjj sjp sjr sjs sla sld sle slf slj sll sln slo slp slr sls sna snd sne snf snj snl snn sno snp snr sns soa sod soe sof soj sol son soo sop sor sos spa spd spe spf spl spn spo spp spr sps sr- sra srd sre srf srj srl srn sro srp srr srs ss- ssa ssd sse ssf ssj ssl ssn sso ssp ssr sss