rrd rrf rrg rrh rri rrl rrn rrr rrs rsa rsc rsd rse rsf rsg rsh rsi rsl rsn rso rsr rss saa sac sad sae saf sag sah sai sal san sao sar sas sca scc scd sce scf scg sch sci scl scn sco scr scs sda sdc sdd sde sdf sdg sdh sdi sdl sdn sdo sdr sds se- sea sec sed see sef seg seh sei sel sen seo ser ses sfa sfc sfd sfe sff sfg sfh sfi sfl sfn sfo sfr sfs sga sgc sgd sge sgf sgg sgh sgi sgl sgn sgo sgr sgs sh- sha shc shd she shf shg shh shi shl shn sho shr shs sia sic sid sie sif sig sih sii sil sin sio sir sis sla slc sld sle slf slg slh sli sll sln slo slr sls sna snc snd sne snf sng sni snl snn sno snr sns soa soc sod soe sof sog soh soi sol son soo sor sos sr- sra src srd sre srf srg srh sri srl srn sro srr srs ss- ssa ssc ssd sse ssf ssg ssh ssi ssl ssn sso ssr sss