rot rrc rrd rrf rrh rrk rrl rrr rrs rrt rsc rsd rse rsf rsh rsk rsl rso rsr rss rst rtc rtd rte rtf rtk rtl rto rtr rts rtt scc scd sce scf sch sck scl sco scr scs sct sdc sdd sde sdf sdh sdk sdl sdo sdr sds sdt se- sec sed see sef seh sek sel seo ser ses set sfc sfd sfe sff sfh sfk sfl sfo sfr sfs sft sh- shc shd she shf shh shk shl sho shr shs sht sk- skc skd ske skf skh skk skl sko skr sks skt slc sld sle slf slh slk sll slo slr sls slt soc sod soe sof soh sok sol soo sor sos sot sr- src srd sre srf srh srk srl sro srr srs srt ss- ssc ssd sse ssf ssh ssk ssl sso ssr sss sst stc std ste stf sth stk stl sto str sts stt tcc tcd tce tcf tch tck tcl tco tcr tcs tct tdc tdd tde tdf tdh tdk tdl tdo tdr tds tdt te- tec ted tee tef teh tek tel teo ter tes tet tfc tfd tfe tff tfh tfk tfl tfo tfr tfs tft th- thc thd the thf thh thk thl tho thr ths tht tkc tke tkk tkl tko tkr tks tkt tlc tld tle tlf tlh tlk tll tlo tlr tls tlt to- toc tod toe tof toh tok tol too tor tos tot trc trd tre trf trh trk trl tro trr trs trt tsc tsd tse tsf tsh tsk tsl tso tsr tss tst ttc ttd tte ttf tth ttk ttl tto ttr tts ttt