rat rca rcc rcd rce rcf rcg rci rcn rcr rcs rct rda rdc rdd rde rdf rdg rdi rdn rdr rds rdt re- rea rec red ree ref reg rei ren rer res ret rfa rfc rfd rfe rff rfg rfi rfn rfr rfs rft rga rgc rgd rge rgf rgg rgi rgn rgr rgs rgt ria ric rid rie rif rig rii rin rir ris rit rna rnc rnd rng rni rnn rnr rns rnt rra rrc rrd rrf rrg rri rrn rrr rrs rrt rsa rsc rsd rse rsf rsg rsi rsn rsr rss rst rta rtc rtd rte rtf rtg rti rtn rtr rts rtt saa sac sad sae saf sag sai san sar sas sat sca scc scd sce scf scg sci scn scr scs sct sda sdc sdd sde sdf sdg sdi sdn sdr sds sdt se- sea sec sed see sef seg sei sen ser ses set sfa sfc sfd sfe sff sfg sfi sfn sfr sfs sft sga sgc sgd sge sgf sgg sgi sgn sgr sgs sgt sia sic sid sie sif sig sii sin sir sis sit sna snc snd sne snf sng sni snn snr sns snt sr- sra src srd sre srf srg sri srn srr srs srt ss- ssa ssc ssd sse ssf ssg ssi ssn ssr sss sst sta stc std ste stf stg sti stn str sts stt taa tac tad tae taf tag tai tan tar tas tat tca tcc tcd tce tcf tcg tci tcn tcr tcs tct tda tdc tdd tde tdf tdg tdi tdn tdr tds tdt te- tea tec ted tee tef teg tei ten ter tes tet tfa tfc tfd tfe tff tfg tfi tfn tfr tfs tft tga tgc tge tgf tgg tgi tgn tgr tgs tgt tia tic tid tie tif tig tii tin tir tis tit tna tnc tnd tne tnf tng tni tnn tnr tns tnt tra trc trd tre trf trg tri trn trr trs trt tsa tsc tsd tse tsf tsg tsi tsn tsr tss tst tta ttc ttd tte ttf ttg tti ttn ttr tts ttt