rft ria rid rie rif rii rik rin rip rir ris rit rke rkf rkk rkp rks rkt rna rnd rni rnn rnp rnr rns rnt rpa rpd rpe rpf rpi rpk rpn rpp rpr rps rpt rra rrd rrf rri rrk rrn rrp rrr rrs rrt rsa rsd rse rsf rsi rsk rsn rsp rsr rss rst rta rtd rte rtf rti rtk rtn rtp rtr rts rtt saa sad sae saf sai sak san sap sar sas sat sda sdd sde sdf sdi sdk sdn sdp sdr sds sdt se- sea sed see sef sei sek sen sep ser ses set sfa sfd sfe sff sfi sfk sfn sfp sfr sfs sft sia sid sie sif sii sik sin sip sir sis sit sk- ska skd ske skf ski skk skp skr sks skt sna snd sne snf sni snk snn snp snr sns snt spa spd spe spf spi spk spn spp spr sps spt sr- sra srd sre srf sri srk srn srp srr srs srt ss- ssa ssd sse ssf ssi ssk ssn ssp ssr sss sst sta std ste stf sti stk stn stp str sts stt taa tad tae taf tai tak tan tap tar tas tat tda tdd tde tdf tdi tdk tdn tdp tdr tds tdt te- tea ted tee tef tei tek ten tep ter tes tet tfa tfd tfe tff tfi tfk tfn tfp tfr tfs tft tia tid tie tif tii tik tin tip tir tis tit tka tke tkk tkp tkr tks tkt tna tnd tne tnf tni tnk tnn tnp tnr tns tnt tpa tpd tpe tpf tpi tpk tpn tpp tpr tps tpt tra trd tre trf tri trk trn trp trr trs trt tsa tsd tse tsf tsi tsk tsn tsp tsr tss tst tta ttd tte ttf tti ttk ttn ttp ttr tts ttt