rsn rso rsp rsr rss rst rtc rte rti rtj rtl rtn rto rtp rtr rts rtt scc sce sci scj scl scn sco scp scr scs sct se- sec see sei sej sel sen seo sep ser ses set sic sie sii sij sil sin sio sip sir sis sit sjc sje sji sjj sjp sjr sjs sjt slc sle sli slj sll sln slo slp slr sls slt snc sne sni snj snl snn sno snp snr sns snt soc soe soi soj sol son soo sop sor sos sot spc spe spi spl spn spo spp spr sps spt sr- src sre sri srj srl srn sro srp srr srs srt ss- ssc sse ssi ssj ssl ssn sso ssp ssr sss sst stc ste sti stj stl stn sto stp str sts stt tcc tce tci tcj tcl tcn tco tcp tcr tcs tct te- tec tee tei tej tel ten teo tep ter tes tet tic tie tii til tin tio tip tir tis tit tjc tje tji tjo tjp tjr tjs tlc tle tli tlj tll tln tlo tlp tlr tls tlt tnc tne tni tnl tnn tno tnp tnr tns tnt to- toc toe toi toj tol ton too top tor tos tot tpc tpe tpi tpj tpl tpn tpo tpp tpr tps tpt trc tre tri trl trn tro trp trr trs trt tsc tse tsi tsj tsl tsn tso tsp tsr tss tst ttc tte tti ttl ttn tto ttp ttr tts ttt