rli rll rlo rlp rlr rls rlt roc roe rof roi rok rol roo rop ror ros rot rpc rpe rpf rpi rpk rpl rpo rpp rpr rps rpt rrc rrf rri rrk rrl rrp rrr rrs rrt rsc rse rsf rsi rsk rsl rso rsp rsr rss rst rtc rte rtf rti rtk rtl rto rtp rtr rts rtt scc sce scf sci sck scl sco scp scr scs sct se- sec see sef sei sek sel seo sep ser ses set sfc sfe sff sfi sfk sfl sfo sfp sfr sfs sft sic sie sif sii sik sil sio sip sir sis sit sk- skc ske skf ski skk skl sko skp skr sks skt slc sle slf sli slk sll slo slp slr sls slt soc soe sof soi sok sol soo sop sor sos sot spc spe spf spi spk spl spo spp spr sps spt sr- src sre srf sri srk srl sro srp srr srs srt ss- ssc sse ssf ssi ssk ssl sso ssp ssr sss sst stc ste stf sti stk stl sto stp str sts stt tcc tce tcf tci tck tcl tco tcp tcr tcs tct te- tec tee tef tei tek tel teo tep ter tes tet tfc tfe tff tfi tfk tfl tfo tfp tfr tfs tft tic tie tif tii tik til tio tip tir tis tit tkc tke tkk tkl tko tkp tkr tks tkt tlc tle tlf tli tlk tll tlo tlp tlr tls tlt to- toc toe tof toi tok tol too top tor tos tot tpc tpe tpf tpi tpk tpl tpo tpp tpr tps tpt trc tre trf tri trk trl tro trp trr trs trt tsc tse tsf tsi tsk tsl tso tsp tsr tss tst ttc tte ttf tti ttk ttl tto ttp ttr tts ttt