raa rab rae raf rai ral rao rap rar ras rat rba rbb rbe rbf rbi rbl rbo rbp rbr rbs rbt re- rea reb ree ref rei rel reo rep rer res ret rfa rfb rfe rff rfi rfl rfo rfp rfr rfs rft ria rib rie rif rii ril rio rip rir ris rit rla rle rlf rli rll rlo rlp rlr rls rlt roa rob roe rof roi rol roo rop ror ros rot rpa rpb rpe rpf rpi rpl rpo rpp rpr rps rpt rra rrb rrf rri rrl rrp rrr rrs rrt rsa rsb rse rsf rsi rsl rso rsp rsr rss rst rta rtb rte rtf rti rtl rto rtp rtr rts rtt saa sab sae saf sai sal sao sap sar sas sat sba sbb sbe sbf sbi sbl sbo sbp sbr sbs sbt se- sea seb see sef sei sel seo sep ser ses set sfa sfb sfe sff sfi sfl sfo sfp sfr sfs sft sia sib sie sif sii sil sio sip sir sis sit sla slb sle slf sli sll slo slp slr sls slt soa sob soe sof soi sol soo sop sor sos sot spa spb spe spf spi spl spo spp spr sps spt sr- sra srb sre srf sri srl sro srp srr srs srt ss- ssa ssb sse ssf ssi ssl sso ssp ssr sss sst sta stb ste stf sti stl sto stp str sts stt taa tab tae taf tai tal tao tap tar tas tat tba tbb tbe tbf tbi tbl tbo tbp tbr tbs tbt te- tea teb tee tef tei tel teo tep ter tes tet tfa tfb tfe tff tfi tfl tfo tfp tfr tfs tft tia tib tie tif tii til tio tip tir tis tit tla tle tlf tli tll tlo tlp tlr tls tlt to- toa tob toe tof toi tol too top tor tos tot tpa tpb tpe tpf tpi tpl tpo tpp tpr tps tpt tra trb tre trf tri trl tro trp trr trs trt tsa tsb tse tsf tsi tsl tso tsp tsr tss tst tta ttb tte ttf tti ttl tto ttp ttr tts ttt