pto ptp ptr pts ptt ra- raa rab rac rae rai ral rao rap rar ras rat rba rbb rbc rbe rbi rbl rbo rbp rbr rbs rbt rca rcb rcc rce rci rcl rco rcp rcr rcs rct re- rea reb rec ree rei rel reo rep rer res ret ria rib ric rie rii ril rio rip rir ris rit rla rlc rle rli rll rlo rlp rlr rls rlt roa rob roc roe roi rol roo rop ror ros rot rpa rpb rpc rpe rpi rpl rpo rpp rpr rps rpt rra rrb rrc rri rrl rrp rrr rrs rrt rsa rsb rsc rse rsi rsl rso rsp rsr rss rst rta rtb rtc rte rti rtl rto rtp rtr rts rtt saa sab sac sae sai sal sao sap sar sas sat sba sbb sbc sbe sbi sbl sbo sbp sbr sbs sbt sca scb scc sce sci scl sco scp scr scs sct se- sea seb sec see sei sel seo sep ser ses set sia sib sic sie sii sil sio sip sir sis sit sla slb slc sle sli sll slo slp slr sls slt soa sob soc soe soi sol soo sop sor sos sot spa spb spc spe spi spl spo spp spr sps spt sr- sra srb src sre sri srl sro srp srr srs srt ss- ssa ssb ssc sse ssi ssl sso ssp ssr sss sst sta stb stc ste sti stl sto stp str sts stt taa tab tac tae tai tal tao tap tar tas tat tba tbb tbc tbe tbi tbl tbo tbp tbr tbs tbt tca tcb tcc tce tci tcl tco tcp tcr tcs tct te- tea teb tec tee tei tel teo tep ter tes tet tia tib tic tie tii til tio tip tir tis tit tla tlc tle tli tll tlo tlp tlr tls tlt to- toa tob toc toe toi tol too top tor tos tot tpa tpb tpc tpe tpi tpl tpo tpp tpr tps tpt tra trb trc tre tri trl tro trp trr trs trt tsa tsb tsc tse tsi tsl tso tsp tsr tss tst tta ttb ttc tte tti ttl tto ttp ttr tts ttt