ptr pts ptt ra- raa rac rae raf rai ral rao rap rar ras rat rca rcc rce rcf rci rcl rco rcp rcr rcs rct re- rea rec ree ref rei rel reo rep rer res ret rfa rfc rfe rff rfi rfl rfo rfp rfr rfs rft ria ric rie rif rii ril rio rip rir ris rit rla rlc rle rlf rli rll rlo rlp rlr rls rlt roa roc roe rof roi rol roo rop ror ros rot rpa rpc rpe rpf rpi rpl rpo rpp rpr rps rpt rra rrc rrf rri rrl rrp rrr rrs rrt rsa rsc rse rsf rsi rsl rso rsp rsr rss rst rta rtc rte rtf rti rtl rto rtp rtr rts rtt saa sac sae saf sai sal sao sap sar sas sat sca scc sce scf sci scl sco scp scr scs sct se- sea sec see sef sei sel seo sep ser ses set sfa sfc sfe sff sfi sfl sfo sfp sfr sfs sft sia sic sie sif sii sil sio sip sir sis sit sla slc sle slf sli sll slo slp slr sls slt soa soc soe sof soi sol soo sop sor sos sot spa spc spe spf spi spl spo spp spr sps spt sr- sra src sre srf sri srl sro srp srr srs srt ss- ssa ssc sse ssf ssi ssl sso ssp ssr sss sst sta stc ste stf sti stl sto stp str sts stt taa tac tae taf tai tal tao tap tar tas tat tca tcc tce tcf tci tcl tco tcp tcr tcs tct te- tea tec tee tef tei tel teo tep ter tes tet tfa tfc tfe tff tfi tfl tfo tfp tfr tfs tft tia tic tie tif tii til tio tip tir tis tit tla tlc tle tlf tli tll tlo tlp tlr tls tlt to- toa toc toe tof toi tol too top tor tos tot tpa tpc tpe tpf tpi tpl tpo tpp tpr tps tpt tra trc tre trf tri trl tro trp trr trs trt tsa tsc tse tsf tsi tsl tso tsp tsr tss tst tta ttc tte ttf tti ttl tto ttp ttr tts ttt