ots ott ra- raa rac rad rae raf rai ran rao rar ras rat rca rcc rcd rce rcf rci rcn rco rcr rcs rct rda rdc rdd rde rdf rdi rdn rdo rdr rds rdt re- rea rec red ree ref rei ren reo rer res ret rfa rfc rfd rfe rff rfi rfn rfo rfr rfs rft ria ric rid rie rif rii rin rio rir ris rit rna rnc rnd rni rnn rno rnr rns rnt roa roc rod roe rof roi ron roo ror ros rot rra rrc rrd rrf rri rrn rrr rrs rrt rsa rsc rsd rse rsf rsi rsn rso rsr rss rst rta rtc rtd rte rtf rti rtn rto rtr rts rtt saa sac sad sae saf sai san sao sar sas sat sca scc scd sce scf sci scn sco scr scs sct sda sdc sdd sde sdf sdi sdn sdo sdr sds sdt se- sea sec sed see sef sei sen seo ser ses set sfa sfc sfd sfe sff sfi sfn sfo sfr sfs sft sia sic sid sie sif sii sin sio sir sis sit sna snc snd sne snf sni snn sno snr sns snt soa soc sod soe sof soi son soo sor sos sot sr- sra src srd sre srf sri srn sro srr srs srt ss- ssa ssc ssd sse ssf ssi ssn sso ssr sss sst sta stc std ste stf sti stn sto str sts stt taa tac tad tae taf tai tan tao tar tas tat tca tcc tcd tce tcf tci tcn tco tcr tcs tct tda tdc tdd tde tdf tdi tdn tdo tdr tds tdt te- tea tec ted tee tef tei ten teo ter tes tet tfa tfc tfd tfe tff tfi tfn tfo tfr tfs tft tia tic tid tie tif tii tin tio tir tis tit tna tnc tnd tne tnf tni tnn tno tnr tns tnt to- toa toc tod toe tof toi ton too tor tos tot tra trc trd tre trf tri trn tro trr trs trt tsa tsc tsd tse tsf tsi tsn tso tsr tss tst tta ttc ttd tte ttf tti ttn tto ttr tts ttt