raf ral ran rao rap rar ras rat rca rcc rce rcf rcl rcn rco rcp rcr rcs rct re- rea rec ree ref rel ren reo rep rer res ret rfa rfc rfe rff rfl rfn rfo rfp rfr rfs rft rla rlc rle rlf rll rln rlo rlp rlr rls rlt rna rnc rnn rno rnp rnr rns rnt roa roc roe rof rol ron roo rop ror ros rot rpa rpc rpe rpf rpl rpn rpo rpp rpr rps rpt rra rrc rrf rrl rrn rrp rrr rrs rrt rsa rsc rse rsf rsl rsn rso rsp rsr rss rst rta rtc rte rtf rtl rtn rto rtp rtr rts rtt saa sac sae saf sal san sao sap sar sas sat sca scc sce scf scl scn sco scp scr scs sct se- sea sec see sef sel sen seo sep ser ses set sfa sfc sfe sff sfl sfn sfo sfp sfr sfs sft sla slc sle slf sll sln slo slp slr sls slt sna snc sne snf snl snn sno snp snr sns snt soa soc soe sof sol son soo sop sor sos sot spa spc spe spf spl spn spo spp spr sps spt sr- sra src sre srf srl srn sro srp srr srs srt ss- ssa ssc sse ssf ssl ssn sso ssp ssr sss sst sta stc ste stf stl stn sto stp str sts stt taa tac tae taf tal tan tao tap tar tas tat tca tcc tce tcf tcl tcn tco tcp tcr tcs tct te- tea tec tee tef tel ten teo tep ter tes tet tfa tfc tfe tff tfl tfn tfo tfp tfr tfs tft tla tlc tle tlf tll tln tlo tlp tlr tls tlt tna tnc tne tnf tnl tnn tno tnp tnr tns tnt to- toa toc toe tof tol ton too top tor tos tot tpa tpc tpe tpf tpl tpn tpo tpp tpr tps tpt tra trc tre trf trl trn tro trp trr trs trt tsa tsc tse tsf tsl tsn tso tsp tsr tss tst tta ttc tte ttf ttl ttn tto ttp ttr tts ttt