rrt rsc rsd rse rsi rsj rsn rso rsp rsr rss rst rtc rtd rte rti rtj rtn rto rtp rtr rts rtt scc scd sce sci scj scn sco scp scr scs sct sdc sdd sde sdi sdj sdn sdo sdp sdr sds sdt se- sec sed see sei sej sen seo sep ser ses set sic sid sie sii sij sin sio sip sir sis sit sjc sjd sje sji sjj sjp sjr sjs sjt snc snd sne sni snj snn sno snp snr sns snt soc sod soe soi soj son soo sop sor sos sot spc spd spe spi spn spo spp spr sps spt sr- src srd sre sri srj srn sro srp srr srs srt ss- ssc ssd sse ssi ssj ssn sso ssp ssr sss sst stc std ste sti stj stn sto stp str sts stt tcc tcd tce tci tcj tcn tco tcp tcr tcs tct tdc tdd tde tdi tdn tdo tdp tdr tds tdt te- tec ted tee tei tej ten teo tep ter tes tet tic tid tie tii tin tio tip tir tis tit tjc tjd tje tji tjo tjp tjr tjs tnc tnd tne tni tnn tno tnp tnr tns tnt to- toc tod toe toi toj ton too top tor tos tot tpc tpd tpe tpi tpj tpn tpo tpp tpr tps tpt trc trd tre tri trn tro trp trr trs trt tsc tsd tse tsi tsj tsn tso tsp tsr tss tst ttc ttd tte tti ttn tto ttp ttr tts ttt