pto ptp ptr pts ptt ra- raa rab rad rae rai ran rao rap rar ras rat rba rbb rbd rbe rbi rbn rbo rbp rbr rbs rbt rda rdb rdd rde rdi rdn rdo rdp rdr rds rdt re- rea reb red ree rei ren reo rep rer res ret ria rib rid rie rii rin rio rip rir ris rit rna rnb rnd rni rnn rno rnp rnr rns rnt roa rob rod roe roi ron roo rop ror ros rot rpa rpb rpd rpe rpi rpn rpo rpp rpr rps rpt rra rrb rrd rri rrn rrp rrr rrs rrt rsa rsb rsd rse rsi rsn rso rsp rsr rss rst rta rtb rtd rte rti rtn rto rtp rtr rts rtt saa sab sad sae sai san sao sap sar sas sat sba sbb sbd sbe sbi sbn sbo sbp sbr sbs sbt sda sdb sdd sde sdi sdn sdo sdp sdr sds sdt se- sea seb sed see sei sen seo sep ser ses set sia sib sid sie sii sin sio sip sir sis sit sna snb snd sne sni snn sno snp snr sns snt soa sob sod soe soi son soo sop sor sos sot spa spb spd spe spi spn spo spp spr sps spt sr- sra srb srd sre sri srn sro srp srr srs srt ss- ssa ssb ssd sse ssi ssn sso ssp ssr sss sst sta stb std ste sti stn sto stp str sts stt taa tab tad tae tai tan tao tap tar tas tat tba tbb tbd tbe tbi tbn tbo tbp tbr tbs tbt tda tdb tdd tde tdi tdn tdo tdp tdr tds tdt te- tea teb ted tee tei ten teo tep ter tes tet tia tib tid tie tii tin tio tip tir tis tit tna tnb tnd tne tni tnn tno tnp tnr tns tnt to- toa tob tod toe toi ton too top tor tos tot tpa tpb tpd tpe tpi tpn tpo tpp tpr tps tpt tra trb trd tre tri trn tro trp trr trs trt tsa tsb tsd tse tsi tsn tso tsp tsr tss tst tta ttb ttd tte tti ttn tto ttp ttr tts ttt