rae rag ran rao rap rar ras rat rca rcc rcd rce rcg rcn rco rcp rcr rcs rct rda rdc rdd rde rdg rdn rdo rdp rdr rds rdt re- rea rec red ree reg ren reo rep rer res ret rga rgc rgd rge rgg rgn rgo rgp rgr rgs rgt rna rnc rnd rng rnn rno rnp rnr rns rnt roa roc rod roe rog ron roo rop ror ros rot rpa rpc rpd rpe rpg rpn rpo rpp rpr rps rpt rra rrc rrd rrg rrn rrp rrr rrs rrt rsa rsc rsd rse rsg rsn rso rsp rsr rss rst rta rtc rtd rte rtg rtn rto rtp rtr rts rtt saa sac sad sae sag san sao sap sar sas sat sca scc scd sce scg scn sco scp scr scs sct sda sdc sdd sde sdg sdn sdo sdp sdr sds sdt se- sea sec sed see seg sen seo sep ser ses set sga sgc sgd sge sgg sgn sgo sgp sgr sgs sgt sna snc snd sne sng snn sno snp snr sns snt soa soc sod soe sog son soo sop sor sos sot spa spc spd spe spg spn spo spp spr sps spt sr- sra src srd sre srg srn sro srp srr srs srt ss- ssa ssc ssd sse ssg ssn sso ssp ssr sss sst sta stc std ste stg stn sto stp str sts stt taa tac tad tae tag tan tao tap tar tas tat tca tcc tcd tce tcg tcn tco tcp tcr tcs tct tda tdc tdd tde tdg tdn tdo tdp tdr tds tdt te- tea tec ted tee teg ten teo tep ter tes tet tga tgc tge tgg tgn tgo tgp tgr tgs tgt tna tnc tnd tne tng tnn tno tnp tnr tns tnt to- toa toc tod toe tog ton too top tor tos tot tpa tpc tpd tpe tpg tpn tpo tpp tpr tps tpt tra trc trd tre trg trn tro trp trr trs trt tsa tsc tsd tse tsg tsn tso tsp tsr tss tst tta ttc ttd tte ttg ttn tto ttp ttr tts ttt