rcn rco rcr rcs rct rda rdc rdd rde rdf rdg rdn rdo rdr rds rdt re- rea rec red ree ref reg ren reo rer res ret rfa rfc rfd rfe rff rfg rfn rfo rfr rfs rft rga rgc rgd rge rgf rgg rgn rgo rgr rgs rgt rna rnc rnd rng rnn rno rnr rns rnt roa roc rod roe rof rog ron roo ror ros rot rra rrc rrd rrf rrg rrn rrr rrs rrt rsa rsc rsd rse rsf rsg rsn rso rsr rss rst rta rtc rtd rte rtf rtg rtn rto rtr rts rtt saa sac sad sae saf sag san sao sar sas sat sca scc scd sce scf scg scn sco scr scs sct sda sdc sdd sde sdf sdg sdn sdo sdr sds sdt se- sea sec sed see sef seg sen seo ser ses set sfa sfc sfd sfe sff sfg sfn sfo sfr sfs sft sga sgc sgd sge sgf sgg sgn sgo sgr sgs sgt sna snc snd sne snf sng snn sno snr sns snt soa soc sod soe sof sog son soo sor sos sot sr- sra src srd sre srf srg srn sro srr srs srt ss- ssa ssc ssd sse ssf ssg ssn sso ssr sss sst sta stc std ste stf stg stn sto str sts stt taa tac tad tae taf tag tan tao tar tas tat tca tcc tcd tce tcf tcg tcn tco tcr tcs tct tda tdc tdd tde tdf tdg tdn tdo tdr tds tdt te- tea tec ted tee tef teg ten teo ter tes tet tfa tfc tfd tfe tff tfg tfn tfo tfr tfs tft tga tgc tge tgf tgg tgn tgo tgr tgs tgt tna tnc tnd tne tnf tng tnn tno tnr tns tnt to- toa toc tod toe tof tog ton too tor tos tot tra trc trd tre trf trg trn tro trr trs trt tsa tsc tsd tse tsf tsg tsn tso tsr tss tst tta ttc ttd tte ttf ttg ttn tto ttr tts ttt