ra- raa rab rac rae raf rai ral rao rar ras rat rba rbb rbc rbe rbf rbi rbl rbo rbr rbs rbt rca rcb rcc rce rcf rci rcl rco rcr rcs rct re- rea reb rec ree ref rei rel reo rer res ret rfa rfb rfc rfe rff rfi rfl rfo rfr rfs rft ria rib ric rie rif rii ril rio rir ris rit rla rlc rle rlf rli rll rlo rlr rls rlt roa rob roc roe rof roi rol roo ror ros rot rra rrb rrc rrf rri rrl rrr rrs rrt rsa rsb rsc rse rsf rsi rsl rso rsr rss rst rta rtb rtc rte rtf rti rtl rto rtr rts rtt saa sab sac sae saf sai sal sao sar sas sat sba sbb sbc sbe sbf sbi sbl sbo sbr sbs sbt sca scb scc sce scf sci scl sco scr scs sct se- sea seb sec see sef sei sel seo ser ses set sfa sfb sfc sfe sff sfi sfl sfo sfr sfs sft sia sib sic sie sif sii sil sio sir sis sit sla slb slc sle slf sli sll slo slr sls slt soa sob soc soe sof soi sol soo sor sos sot sr- sra srb src sre srf sri srl sro srr srs srt ss- ssa ssb ssc sse ssf ssi ssl sso ssr sss sst sta stb stc ste stf sti stl sto str sts stt taa tab tac tae taf tai tal tao tar tas tat tba tbb tbc tbe tbf tbi tbl tbo tbr tbs tbt tca tcb tcc tce tcf tci tcl tco tcr tcs tct te- tea teb tec tee tef tei tel teo ter tes tet tfa tfb tfc tfe tff tfi tfl tfo tfr tfs tft tia tib tic tie tif tii til tio tir tis tit tla tlc tle tlf tli tll tlo tlr tls tlt to- toa tob toc toe tof toi tol too tor tos tot tra trb trc tre trf tri trl tro trr trs trt tsa tsb tsc tse tsf tsi tsl tso tsr tss tst tta ttb ttc tte ttf tti ttl tto ttr tts ttt