pts ptt ra- raa rac rad rae raf rai rao rap rar ras rat rca rcc rcd rce rcf rci rco rcp rcr rcs rct rda rdc rdd rde rdf rdi rdo rdp rdr rds rdt re- rea rec red ree ref rei reo rep rer res ret rfa rfc rfd rfe rff rfi rfo rfp rfr rfs rft ria ric rid rie rif rii rio rip rir ris rit roa roc rod roe rof roi roo rop ror ros rot rpa rpc rpd rpe rpf rpi rpo rpp rpr rps rpt rra rrc rrd rrf rri rrp rrr rrs rrt rsa rsc rsd rse rsf rsi rso rsp rsr rss rst rta rtc rtd rte rtf rti rto rtp rtr rts rtt saa sac sad sae saf sai sao sap sar sas sat sca scc scd sce scf sci sco scp scr scs sct sda sdc sdd sde sdf sdi sdo sdp sdr sds sdt se- sea sec sed see sef sei seo sep ser ses set sfa sfc sfd sfe sff sfi sfo sfp sfr sfs sft sia sic sid sie sif sii sio sip sir sis sit soa soc sod soe sof soi soo sop sor sos sot spa spc spd spe spf spi spo spp spr sps spt sr- sra src srd sre srf sri sro srp srr srs srt ss- ssa ssc ssd sse ssf ssi sso ssp ssr sss sst sta stc std ste stf sti sto stp str sts stt taa tac tad tae taf tai tao tap tar tas tat tca tcc tcd tce tcf tci tco tcp tcr tcs tct tda tdc tdd tde tdf tdi tdo tdp tdr tds tdt te- tea tec ted tee tef tei teo tep ter tes tet tfa tfc tfd tfe tff tfi tfo tfp tfr tfs tft tia tic tid tie tif tii tio tip tir tis tit to- toa toc tod toe tof toi too top tor tos tot tpa tpc tpd tpe tpf tpi tpo tpp tpr tps tpt tra trc trd tre trf tri tro trp trr trs trt tsa tsc tsd tse tsf tsi tso tsp tsr tss tst tta ttc ttd tte ttf tti tto ttp ttr tts ttt