rbn rbr rbs rbt rda rdb rdd rde rdf rdg rdi rdn rdr rds rdt re- rea reb red ree ref reg rei ren rer res ret rfa rfb rfd rfe rff rfg rfi rfn rfr rfs rft rga rgb rgd rge rgf rgg rgi rgn rgr rgs rgt ria rib rid rie rif rig rii rin rir ris rit rna rnb rnd rng rni rnn rnr rns rnt rra rrb rrd rrf rrg rri rrn rrr rrs rrt rsa rsb rsd rse rsf rsg rsi rsn rsr rss rst rta rtb rtd rte rtf rtg rti rtn rtr rts rtt saa sab sad sae saf sag sai san sar sas sat sba sbb sbd sbe sbf sbg sbi sbn sbr sbs sbt sda sdb sdd sde sdf sdg sdi sdn sdr sds sdt se- sea seb sed see sef seg sei sen ser ses set sfa sfb sfd sfe sff sfg sfi sfn sfr sfs sft sga sgb sgd sge sgf sgg sgi sgn sgr sgs sgt sia sib sid sie sif sig sii sin sir sis sit sna snb snd sne snf sng sni snn snr sns snt sr- sra srb srd sre srf srg sri srn srr srs srt ss- ssa ssb ssd sse ssf ssg ssi ssn ssr sss sst sta stb std ste stf stg sti stn str sts stt taa tab tad tae taf tag tai tan tar tas tat tba tbb tbd tbe tbf tbg tbi tbn tbr tbs tbt tda tdb tdd tde tdf tdg tdi tdn tdr tds tdt te- tea teb ted tee tef teg tei ten ter tes tet tfa tfb tfd tfe tff tfg tfi tfn tfr tfs tft tga tgb tge tgf tgg tgi tgn tgr tgs tgt tia tib tid tie tif tig tii tin tir tis tit tna tnb tnd tne tnf tng tni tnn tnr tns tnt tra trb trd tre trf trg tri trn trr trs trt tsa tsb tsd tse tsf tsg tsi tsn tsr tss tst tta ttb ttd tte ttf ttg tti ttn ttr tts ttt