sej sel sen seo sep ser ses set sfe sff sfi sfj sfl sfn sfo sfp sfr sfs sft sie sif sii sij sil sin sio sip sir sis sit sje sjf sji sjj sjp sjr sjs sjt sle slf sli slj sll sln slo slp slr sls slt sne snf sni snj snl snn sno snp snr sns snt soe sof soi soj sol son soo sop sor sos sot spe spf spi spl spn spo spp spr sps spt sr- sre srf sri srj srl srn sro srp srr srs srt ss- sse ssf ssi ssj ssl ssn sso ssp ssr sss sst ste stf sti stj stl stn sto stp str sts stt te- tee tef tei tej tel ten teo tep ter tes tet tfe tff tfi tfj tfl tfn tfo tfp tfr tfs tft tie tif tii til tin tio tip tir tis tit tje tjf tji tjo tjp tjr tjs tle tlf tli tlj tll tln tlo tlp tlr tls tlt tne tnf tni tnl tnn tno tnp tnr tns tnt to- toe tof toi toj tol ton too top tor tos tot tpe tpf tpi tpj tpl tpn tpo tpp tpr tps tpt tre trf tri trl trn tro trp trr trs trt tse tsf tsi tsj tsl tsn tso tsp tsr tss tst tte ttf tti ttl ttn tto ttp ttr tts ttt