rke rkf rkk rkp rks rkt rnc rnd rni rnn rnp rnr rns rnt rpc rpd rpe rpf rpi rpk rpn rpp rpr rps rpt rrc rrd rrf rri rrk rrn rrp rrr rrs rrt rsc rsd rse rsf rsi rsk rsn rsp rsr rss rst rtc rtd rte rtf rti rtk rtn rtp rtr rts rtt scc scd sce scf sci sck scn scp scr scs sct sdc sdd sde sdf sdi sdk sdn sdp sdr sds sdt se- sec sed see sef sei sek sen sep ser ses set sfc sfd sfe sff sfi sfk sfn sfp sfr sfs sft sic sid sie sif sii sik sin sip sir sis sit sk- skc skd ske skf ski skk skp skr sks skt snc snd sne snf sni snk snn snp snr sns snt spc spd spe spf spi spk spn spp spr sps spt sr- src srd sre srf sri srk srn srp srr srs srt ss- ssc ssd sse ssf ssi ssk ssn ssp ssr sss sst stc std ste stf sti stk stn stp str sts stt tcc tcd tce tcf tci tck tcn tcp tcr tcs tct tdc tdd tde tdf tdi tdk tdn tdp tdr tds tdt te- tec ted tee tef tei tek ten tep ter tes tet tfc tfd tfe tff tfi tfk tfn tfp tfr tfs tft tic tid tie tif tii tik tin tip tir tis tit tkc tke tkk tkp tkr tks tkt tnc tnd tne tnf tni tnk tnn tnp tnr tns tnt tpc tpd tpe tpf tpi tpk tpn tpp tpr tps tpt trc trd tre trf tri trk trn trp trr trs trt tsc tsd tse tsf tsi tsk tsn tsp tsr tss tst ttc ttd tte ttf tti ttk ttn ttp ttr tts ttt