ppp ppr pps prd pre prf prh pri prk prl prn prp prr prs ps- psd pse psf psh psi psk psl psn psp psr pss rdd rde rdf rdh rdi rdl rdn rdp rdr rds re- red ree ref reh rei rek rel ren rep rer res rfd rfe rff rfh rfi rfk rfl rfn rfp rfr rfs rh- rhd rhe rhf rhh rhi rhl rhn rhp rhr rhs rid rie rif rih rii rik ril rin rip rir ris rke rkf rkk rkp rks rld rle rlf rlh rli rll rln rlp rlr rls rnd rnh rni rnn rnp rnr rns rpd rpe rpf rph rpi rpk rpl rpn rpp rpr rps rrd rrf rrh rri rrk rrl rrn rrp rrr rrs rsd rse rsf rsh rsi rsk rsl rsn rsp rsr rss sdd sde sdf sdh sdi sdk sdl sdn sdp sdr sds se- sed see sef seh sei sek sel sen sep ser ses sfd sfe sff sfh sfi sfk sfl sfn sfp sfr sfs sh- shd she shf shh shi shk shl shn shp shr shs sid sie sif sih sii sik sil sin sip sir sis sk- skd ske skf skh ski skk skl skp skr sks sld sle slf slh sli slk sll sln slp slr sls snd sne snf sni snk snl snn snp snr sns spd spe spf sph spi spk spl spn spp spr sps sr- srd sre srf srh sri srk srl srn srp srr srs ss- ssd sse ssf ssh ssi ssk ssl ssn ssp ssr sss