oto otr ots ott ra- raa rab rac rad rae rai ral rao rar ras rat rba rbb rbc rbd rbe rbi rbl rbo rbr rbs rbt rca rcb rcc rcd rce rci rcl rco rcr rcs rct rda rdb rdc rdd rde rdi rdl rdo rdr rds rdt re- rea reb rec red ree rei rel reo rer res ret ria rib ric rid rie rii ril rio rir ris rit rla rlc rld rle rli rll rlo rlr rls rlt roa rob roc rod roe roi rol roo ror ros rot rra rrb rrc rrd rri rrl rrr rrs rrt rsa rsb rsc rsd rse rsi rsl rso rsr rss rst rta rtb rtc rtd rte rti rtl rto rtr rts rtt saa sab sac sad sae sai sal sao sar sas sat sba sbb sbc sbd sbe sbi sbl sbo sbr sbs sbt sca scb scc scd sce sci scl sco scr scs sct sda sdb sdc sdd sde sdi sdl sdo sdr sds sdt se- sea seb sec sed see sei sel seo ser ses set sia sib sic sid sie sii sil sio sir sis sit sla slb slc sld sle sli sll slo slr sls slt soa sob soc sod soe soi sol soo sor sos sot sr- sra srb src srd sre sri srl sro srr srs srt ss- ssa ssb ssc ssd sse ssi ssl sso ssr sss sst sta stb stc std ste sti stl sto str sts stt taa tab tac tad tae tai tal tao tar tas tat tba tbb tbc tbd tbe tbi tbl tbo tbr tbs tbt tca tcb tcc tcd tce tci tcl tco tcr tcs tct tda tdb tdc tdd tde tdi tdl tdo tdr tds tdt te- tea teb tec ted tee tei tel teo ter tes tet tia tib tic tid tie tii til tio tir tis tit tla tlc tld tle tli tll tlo tlr tls tlt to- toa tob toc tod toe toi tol too tor tos tot tra trb trc trd tre tri trl tro trr trs trt tsa tsb tsc tsd tse tsi tsl tso tsr tss tst tta ttb ttc ttd tte tti ttl tto ttr tts ttt