rat rca rcc rcd rce rcf rcl rcn rcp rcr rcs rct rda rdc rdd rde rdf rdl rdn rdp rdr rds rdt re- rea rec red ree ref rel ren rep rer res ret rfa rfc rfd rfe rff rfl rfn rfp rfr rfs rft rla rlc rld rle rlf rll rln rlp rlr rls rlt rna rnc rnd rnn rnp rnr rns rnt rpa rpc rpd rpe rpf rpl rpn rpp rpr rps rpt rra rrc rrd rrf rrl rrn rrp rrr rrs rrt rsa rsc rsd rse rsf rsl rsn rsp rsr rss rst rta rtc rtd rte rtf rtl rtn rtp rtr rts rtt saa sac sad sae saf sal san sap sar sas sat sca scc scd sce scf scl scn scp scr scs sct sda sdc sdd sde sdf sdl sdn sdp sdr sds sdt se- sea sec sed see sef sel sen sep ser ses set sfa sfc sfd sfe sff sfl sfn sfp sfr sfs sft sla slc sld sle slf sll sln slp slr sls slt sna snc snd sne snf snl snn snp snr sns snt spa spc spd spe spf spl spn spp spr sps spt sr- sra src srd sre srf srl srn srp srr srs srt ss- ssa ssc ssd sse ssf ssl ssn ssp ssr sss sst sta stc std ste stf stl stn stp str sts stt taa tac tad tae taf tal tan tap tar tas tat tca tcc tcd tce tcf tcl tcn tcp tcr tcs tct tda tdc tdd tde tdf tdl tdn tdp tdr tds tdt te- tea tec ted tee tef tel ten tep ter tes tet tfa tfc tfd tfe tff tfl tfn tfp tfr tfs tft tla tlc tld tle tlf tll tln tlp tlr tls tlt tna tnc tnd tne tnf tnl tnn tnp tnr tns tnt tpa tpc tpd tpe tpf tpl tpn tpp tpr tps tpt tra trc trd tre trf trl trn trp trr trs trt tsa tsc tsd tse tsf tsl tsn tsp tsr tss tst tta ttc ttd tte ttf ttl ttn ttp ttr tts ttt