rrs rrt rsc rsd rse rsi rsj rsl rso rsp rsr rss rst rtc rtd rte rti rtj rtl rto rtp rtr rts rtt scc scd sce sci scj scl sco scp scr scs sct sdc sdd sde sdi sdj sdl sdo sdp sdr sds sdt se- sec sed see sei sej sel seo sep ser ses set sic sid sie sii sij sil sio sip sir sis sit sjc sjd sje sji sjj sjp sjr sjs sjt slc sld sle sli slj sll slo slp slr sls slt soc sod soe soi soj sol soo sop sor sos sot spc spd spe spi spl spo spp spr sps spt sr- src srd sre sri srj srl sro srp srr srs srt ss- ssc ssd sse ssi ssj ssl sso ssp ssr sss sst stc std ste sti stj stl sto stp str sts stt tcc tcd tce tci tcj tcl tco tcp tcr tcs tct tdc tdd tde tdi tdl tdo tdp tdr tds tdt te- tec ted tee tei tej tel teo tep ter tes tet tic tid tie tii til tio tip tir tis tit tjc tjd tje tji tjo tjp tjr tjs tlc tld tle tli tlj tll tlo tlp tlr tls tlt to- toc tod toe toi toj tol too top tor tos tot tpc tpd tpe tpi tpj tpl tpo tpp tpr tps tpt trc trd tre tri trl tro trp trr trs trt tsc tsd tse tsi tsj tsl tso tsp tsr tss tst ttc ttd tte tti ttl tto ttp ttr tts ttt