rbr rbs rbt rda rdb rdd rde rdf rdg rdl rdo rdr rds rdt re- rea reb red ree ref reg rel reo rer res ret rfa rfb rfd rfe rff rfg rfl rfo rfr rfs rft rga rgb rgd rge rgf rgg rgo rgr rgs rgt rla rld rle rlf rlg rll rlo rlr rls rlt roa rob rod roe rof rog rol roo ror ros rot rra rrb rrd rrf rrg rrl rrr rrs rrt rsa rsb rsd rse rsf rsg rsl rso rsr rss rst rta rtb rtd rte rtf rtg rtl rto rtr rts rtt saa sab sad sae saf sag sal sao sar sas sat sba sbb sbd sbe sbf sbg sbl sbo sbr sbs sbt sda sdb sdd sde sdf sdg sdl sdo sdr sds sdt se- sea seb sed see sef seg sel seo ser ses set sfa sfb sfd sfe sff sfg sfl sfo sfr sfs sft sga sgb sgd sge sgf sgg sgl sgo sgr sgs sgt sla slb sld sle slf slg sll slo slr sls slt soa sob sod soe sof sog sol soo sor sos sot sr- sra srb srd sre srf srg srl sro srr srs srt ss- ssa ssb ssd sse ssf ssg ssl sso ssr sss sst sta stb std ste stf stg stl sto str sts stt taa tab tad tae taf tag tal tao tar tas tat tba tbb tbd tbe tbf tbg tbl tbo tbr tbs tbt tda tdb tdd tde tdf tdg tdl tdo tdr tds tdt te- tea teb ted tee tef teg tel teo ter tes tet tfa tfb tfd tfe tff tfg tfl tfo tfr tfs tft tga tgb tge tgf tgg tgl tgo tgr tgs tgt tla tld tle tlf tlg tll tlo tlr tls tlt to- toa tob tod toe tof tog tol too tor tos tot tra trb trd tre trf trg trl tro trr trs trt tsa tsb tsd tse tsf tsg tsl tso tsr tss tst tta ttb ttd tte ttf ttg ttl tto ttr tts ttt