pto ptp ptr pts ptt ra- raa rac rae raf rai ran rao rap rar ras rat rca rcc rce rcf rci rcn rco rcp rcr rcs rct re- rea rec ree ref rei ren reo rep rer res ret rfa rfc rfe rff rfi rfn rfo rfp rfr rfs rft ria ric rie rif rii rin rio rip rir ris rit rna rnc rni rnn rno rnp rnr rns rnt roa roc roe rof roi ron roo rop ror ros rot rpa rpc rpe rpf rpi rpn rpo rpp rpr rps rpt rra rrc rrf rri rrn rrp rrr rrs rrt rsa rsc rse rsf rsi rsn rso rsp rsr rss rst rta rtc rte rtf rti rtn rto rtp rtr rts rtt saa sac sae saf sai san sao sap sar sas sat sca scc sce scf sci scn sco scp scr scs sct se- sea sec see sef sei sen seo sep ser ses set sfa sfc sfe sff sfi sfn sfo sfp sfr sfs sft sia sic sie sif sii sin sio sip sir sis sit sna snc sne snf sni snn sno snp snr sns snt soa soc soe sof soi son soo sop sor sos sot spa spc spe spf spi spn spo spp spr sps spt sr- sra src sre srf sri srn sro srp srr srs srt ss- ssa ssc sse ssf ssi ssn sso ssp ssr sss sst sta stc ste stf sti stn sto stp str sts stt taa tac tae taf tai tan tao tap tar tas tat tca tcc tce tcf tci tcn tco tcp tcr tcs tct te- tea tec tee tef tei ten teo tep ter tes tet tfa tfc tfe tff tfi tfn tfo tfp tfr tfs tft tia tic tie tif tii tin tio tip tir tis tit tna tnc tne tnf tni tnn tno tnp tnr tns tnt to- toa toc toe tof toi ton too top tor tos tot tpa tpc tpe tpf tpi tpn tpo tpp tpr tps tpt tra trc tre trf tri trn tro trp trr trs trt tsa tsc tse tsf tsi tsn tso tsp tsr tss tst tta ttc tte ttf tti ttn tto ttp ttr tts ttt