ra- raa rac rad rae rag rai rao rap rar ras rat rca rcc rcd rce rcg rci rco rcp rcr rcs rct rda rdc rdd rde rdg rdi rdo rdp rdr rds rdt re- rea rec red ree reg rei reo rep rer res ret rga rgc rgd rge rgg rgi rgo rgp rgr rgs rgt ria ric rid rie rig rii rio rip rir ris rit roa roc rod roe rog roi roo rop ror ros rot rpa rpc rpd rpe rpg rpi rpo rpp rpr rps rpt rra rrc rrd rrg rri rrp rrr rrs rrt rsa rsc rsd rse rsg rsi rso rsp rsr rss rst rta rtc rtd rte rtg rti rto rtp rtr rts rtt saa sac sad sae sag sai sao sap sar sas sat sca scc scd sce scg sci sco scp scr scs sct sda sdc sdd sde sdg sdi sdo sdp sdr sds sdt se- sea sec sed see seg sei seo sep ser ses set sga sgc sgd sge sgg sgi sgo sgp sgr sgs sgt sia sic sid sie sig sii sio sip sir sis sit soa soc sod soe sog soi soo sop sor sos sot spa spc spd spe spg spi spo spp spr sps spt sr- sra src srd sre srg sri sro srp srr srs srt ss- ssa ssc ssd sse ssg ssi sso ssp ssr sss sst sta stc std ste stg sti sto stp str sts stt taa tac tad tae tag tai tao tap tar tas tat tca tcc tcd tce tcg tci tco tcp tcr tcs tct tda tdc tdd tde tdg tdi tdo tdp tdr tds tdt te- tea tec ted tee teg tei teo tep ter tes tet tga tgc tge tgg tgi tgo tgp tgr tgs tgt tia tic tid tie tig tii tio tip tir tis tit to- toa toc tod toe tog toi too top tor tos tot tpa tpc tpd tpe tpg tpi tpo tpp tpr tps tpt tra trc trd tre trg tri tro trp trr trs trt tsa tsc tsd tse tsg tsi tso tsp tsr tss tst tta ttc ttd tte ttg tti tto ttp ttr tts ttt