ras rat rca rcc rce rcf rcg rci rcn rco rcr rcs rct re- rea rec ree ref reg rei ren reo rer res ret rfa rfc rfe rff rfg rfi rfn rfo rfr rfs rft rga rgc rge rgf rgg rgi rgn rgo rgr rgs rgt ria ric rie rif rig rii rin rio rir ris rit rna rnc rng rni rnn rno rnr rns rnt roa roc roe rof rog roi ron roo ror ros rot rra rrc rrf rrg rri rrn rrr rrs rrt rsa rsc rse rsf rsg rsi rsn rso rsr rss rst rta rtc rte rtf rtg rti rtn rto rtr rts rtt saa sac sae saf sag sai san sao sar sas sat sca scc sce scf scg sci scn sco scr scs sct se- sea sec see sef seg sei sen seo ser ses set sfa sfc sfe sff sfg sfi sfn sfo sfr sfs sft sga sgc sge sgf sgg sgi sgn sgo sgr sgs sgt sia sic sie sif sig sii sin sio sir sis sit sna snc sne snf sng sni snn sno snr sns snt soa soc soe sof sog soi son soo sor sos sot sr- sra src sre srf srg sri srn sro srr srs srt ss- ssa ssc sse ssf ssg ssi ssn sso ssr sss sst sta stc ste stf stg sti stn sto str sts stt taa tac tae taf tag tai tan tao tar tas tat tca tcc tce tcf tcg tci tcn tco tcr tcs tct te- tea tec tee tef teg tei ten teo ter tes tet tfa tfc tfe tff tfg tfi tfn tfo tfr tfs tft tga tgc tge tgf tgg tgi tgn tgo tgr tgs tgt tia tic tie tif tig tii tin tio tir tis tit tna tnc tne tnf tng tni tnn tno tnr tns tnt to- toa toc toe tof tog toi ton too tor tos tot tra trc tre trf trg tri trn tro trr trs trt tsa tsc tse tsf tsg tsi tsn tso tsr tss tst tta ttc tte ttf ttg tti ttn tto ttr tts ttt