rcn rco rcp rcr rcs rct rdc rdd rde rdi rdl rdn rdo rdp rdr rds rdt re- rec red ree rei rel ren reo rep rer res ret ric rid rie rii ril rin rio rip rir ris rit rlc rld rle rli rll rln rlo rlp rlr rls rlt rnc rnd rni rnn rno rnp rnr rns rnt roc rod roe roi rol ron roo rop ror ros rot rpc rpd rpe rpi rpl rpn rpo rpp rpr rps rpt rrc rrd rri rrl rrn rrp rrr rrs rrt rsc rsd rse rsi rsl rsn rso rsp rsr rss rst rtc rtd rte rti rtl rtn rto rtp rtr rts rtt scc scd sce sci scl scn sco scp scr scs sct sdc sdd sde sdi sdl sdn sdo sdp sdr sds sdt se- sec sed see sei sel sen seo sep ser ses set sic sid sie sii sil sin sio sip sir sis sit slc sld sle sli sll sln slo slp slr sls slt snc snd sne sni snl snn sno snp snr sns snt soc sod soe soi sol son soo sop sor sos sot spc spd spe spi spl spn spo spp spr sps spt sr- src srd sre sri srl srn sro srp srr srs srt ss- ssc ssd sse ssi ssl ssn sso ssp ssr sss sst stc std ste sti stl stn sto stp str sts stt tcc tcd tce tci tcl tcn tco tcp tcr tcs tct tdc tdd tde tdi tdl tdn tdo tdp tdr tds tdt te- tec ted tee tei tel ten teo tep ter tes tet tic tid tie tii til tin tio tip tir tis tit tlc tld tle tli tll tln tlo tlp tlr tls tlt tnc tnd tne tni tnl tnn tno tnp tnr tns tnt to- toc tod toe toi tol ton too top tor tos tot tpc tpd tpe tpi tpl tpn tpo tpp tpr tps tpt trc trd tre tri trl trn tro trp trr trs trt tsc tsd tse tsi tsl tsn tso tsp tsr tss tst ttc ttd tte tti ttl ttn tto ttp ttr tts ttt