rcf rcg rci rcl rcn rcr rcs rct re- rea rec ree ref reg rei rel ren rer res ret rfa rfc rfe rff rfg rfi rfl rfn rfr rfs rft rga rgc rge rgf rgg rgi rgn rgr rgs rgt ria ric rie rif rig rii ril rin rir ris rit rla rlc rle rlf rlg rli rll rln rlr rls rlt rna rnc rng rni rnn rnr rns rnt rra rrc rrf rrg rri rrl rrn rrr rrs rrt rsa rsc rse rsf rsg rsi rsl rsn rsr rss rst rta rtc rte rtf rtg rti rtl rtn rtr rts rtt saa sac sae saf sag sai sal san sar sas sat sca scc sce scf scg sci scl scn scr scs sct se- sea sec see sef seg sei sel sen ser ses set sfa sfc sfe sff sfg sfi sfl sfn sfr sfs sft sga sgc sge sgf sgg sgi sgl sgn sgr sgs sgt sia sic sie sif sig sii sil sin sir sis sit sla slc sle slf slg sli sll sln slr sls slt sna snc sne snf sng sni snl snn snr sns snt sr- sra src sre srf srg sri srl srn srr srs srt ss- ssa ssc sse ssf ssg ssi ssl ssn ssr sss sst sta stc ste stf stg sti stl stn str sts stt taa tac tae taf tag tai tal tan tar tas tat tca tcc tce tcf tcg tci tcl tcn tcr tcs tct te- tea tec tee tef teg tei tel ten ter tes tet tfa tfc tfe tff tfg tfi tfl tfn tfr tfs tft tga tgc tge tgf tgg tgi tgl tgn tgr tgs tgt tia tic tie tif tig tii til tin tir tis tit tla tlc tle tlf tlg tli tll tln tlr tls tlt tna tnc tne tnf tng tni tnl tnn tnr tns tnt tra trc tre trf trg tri trl trn trr trs trt tsa tsc tse tsf tsg tsi tsl tsn tsr tss tst tta ttc tte ttf ttg tti ttl ttn ttr tts ttt