ra- raa rac rad rae rag rai ral rap rar ras rat rca rcc rcd rce rcg rci rcl rcp rcr rcs rct rda rdc rdd rde rdg rdi rdl rdp rdr rds rdt re- rea rec red ree reg rei rel rep rer res ret rga rgc rgd rge rgg rgi rgp rgr rgs rgt ria ric rid rie rig rii ril rip rir ris rit rla rlc rld rle rlg rli rll rlp rlr rls rlt rpa rpc rpd rpe rpg rpi rpl rpp rpr rps rpt rra rrc rrd rrg rri rrl rrp rrr rrs rrt rsa rsc rsd rse rsg rsi rsl rsp rsr rss rst rta rtc rtd rte rtg rti rtl rtp rtr rts rtt saa sac sad sae sag sai sal sap sar sas sat sca scc scd sce scg sci scl scp scr scs sct sda sdc sdd sde sdg sdi sdl sdp sdr sds sdt se- sea sec sed see seg sei sel sep ser ses set sga sgc sgd sge sgg sgi sgl sgp sgr sgs sgt sia sic sid sie sig sii sil sip sir sis sit sla slc sld sle slg sli sll slp slr sls slt spa spc spd spe spg spi spl spp spr sps spt sr- sra src srd sre srg sri srl srp srr srs srt ss- ssa ssc ssd sse ssg ssi ssl ssp ssr sss sst sta stc std ste stg sti stl stp str sts stt taa tac tad tae tag tai tal tap tar tas tat tca tcc tcd tce tcg tci tcl tcp tcr tcs tct tda tdc tdd tde tdg tdi tdl tdp tdr tds tdt te- tea tec ted tee teg tei tel tep ter tes tet tga tgc tge tgg tgi tgl tgp tgr tgs tgt tia tic tid tie tig tii til tip tir tis tit tla tlc tld tle tlg tli tll tlp tlr tls tlt tpa tpc tpd tpe tpg tpi tpl tpp tpr tps tpt tra trc trd tre trg tri trl trp trr trs trt tsa tsc tsd tse tsg tsi tsl tsp tsr tss tst tta ttc ttd tte ttg tti ttl ttp ttr tts ttt