raa rab rad rae raf rai ram rao rar ras rat rba rbb rbd rbe rbf rbi rbm rbo rbr rbs rbt rda rdb rdd rde rdf rdi rdm rdo rdr rds rdt re- rea reb red ree ref rei rem reo rer res ret rfa rfb rfd rfe rff rfi rfm rfo rfr rfs rft ria rib rid rie rif rii rim rio rir ris rit rma rmb rmd rme rmf rmi rmm rmo rmr rms rmt roa rob rod roe rof roi rom roo ror ros rot rra rrb rrd rrf rri rrm rrr rrs rrt rsa rsb rsd rse rsf rsi rsm rso rsr rss rst rta rtb rtd rte rtf rti rtm rto rtr rts rtt saa sab sad sae saf sai sam sao sar sas sat sba sbb sbd sbe sbf sbi sbm sbo sbr sbs sbt sda sdb sdd sde sdf sdi sdm sdo sdr sds sdt se- sea seb sed see sef sei sem seo ser ses set sfa sfb sfd sfe sff sfi sfm sfo sfr sfs sft sia sib sid sie sif sii sim sio sir sis sit sma smb smd sme smf smi smm smo smr sms smt soa sob sod soe sof soi som soo sor sos sot sr- sra srb srd sre srf sri srm sro srr srs srt ss- ssa ssb ssd sse ssf ssi ssm sso ssr sss sst sta stb std ste stf sti stm sto str sts stt taa tab tad tae taf tai tam tao tar tas tat tba tbb tbd tbe tbf tbi tbm tbo tbr tbs tbt tda tdb tdd tde tdf tdi tdm tdo tdr tds tdt te- tea teb ted tee tef tei tem teo ter tes tet tfa tfb tfd tfe tff tfi tfm tfo tfr tfs tft tia tib tid tie tif tii tim tio tir tis tit tma tmb tmd tme tmf tmi tmm tmo tmr tms tmt to- toa tob tod toe tof toi tom too tor tos tot tra trb trd tre trf tri trm tro trr trs trt tsa tsb tsd tse tsf tsi tsm tso tsr tss tst tta ttb ttd tte ttf tti ttm tto ttr tts ttt