rat rba rbb rbc rbe rbg rbi rbl rbn rbr rbs rbt rca rcb rcc rce rcg rci rcl rcn rcr rcs rct re- rea reb rec ree reg rei rel ren rer res ret rga rgb rgc rge rgg rgi rgn rgr rgs rgt ria rib ric rie rig rii ril rin rir ris rit rla rlc rle rlg rli rll rln rlr rls rlt rna rnb rnc rng rni rnn rnr rns rnt rra rrb rrc rrg rri rrl rrn rrr rrs rrt rsa rsb rsc rse rsg rsi rsl rsn rsr rss rst rta rtb rtc rte rtg rti rtl rtn rtr rts rtt saa sab sac sae sag sai sal san sar sas sat sba sbb sbc sbe sbg sbi sbl sbn sbr sbs sbt sca scb scc sce scg sci scl scn scr scs sct se- sea seb sec see seg sei sel sen ser ses set sga sgb sgc sge sgg sgi sgl sgn sgr sgs sgt sia sib sic sie sig sii sil sin sir sis sit sla slb slc sle slg sli sll sln slr sls slt sna snb snc sne sng sni snl snn snr sns snt sr- sra srb src sre srg sri srl srn srr srs srt ss- ssa ssb ssc sse ssg ssi ssl ssn ssr sss sst sta stb stc ste stg sti stl stn str sts stt taa tab tac tae tag tai tal tan tar tas tat tba tbb tbc tbe tbg tbi tbl tbn tbr tbs tbt tca tcb tcc tce tcg tci tcl tcn tcr tcs tct te- tea teb tec tee teg tei tel ten ter tes tet tga tgb tgc tge tgg tgi tgl tgn tgr tgs tgt tia tib tic tie tig tii til tin tir tis tit tla tlc tle tlg tli tll tln tlr tls tlt tna tnb tnc tne tng tni tnl tnn tnr tns tnt tra trb trc tre trg tri trl trn trr trs trt tsa tsb tsc tse tsg tsi tsl tsn tsr tss tst tta ttb ttc tte ttg tti ttl ttn ttr tts ttt