ser ses set sey sna snc snd sne snn sno snp snr sns snt sny soa soc sod soe son soo sop sor sos sot soy spa spc spd spe spn spo spp spr sps spt spy sr- sra src srd sre srn sro srp srr srs srt sry ss- ssa ssc ssd sse ssn sso ssp ssr sss sst sta stc std ste stn sto stp str sts stt sty sy- sya syc syd sye syn syp syr sys syt taa tac tad tae tan tao tap tar tas tat tay tca tcc tcd tce tcn tco tcp tcr tcs tct tda tdc tdd tde tdn tdo tdp tdr tds tdt tdy te- tea tec ted tee ten teo tep ter tes tet tey tna tnc tnd tne tnn tno tnp tnr tns tnt to- toa toc tod toe ton too top tor tos tot toy tpa tpc tpd tpe tpn tpo tpp tpr tps tpt tra trc trd tre trn tro trp trr trs trt try tsa tsc tsd tse tsn tso tsp tsr tss tst tsy tta ttc ttd tte ttn tto ttp ttr tts ttt tty tya tyc tyd tye tyn tyo typ tyr tys tyt yaa yac yad yae yan yao yap yar yas yat yay yca ycc ycd yce yco ycp ycs ycy yda yde ydn ydo yds ydt ydy yea yec yed yee yen yeo yep yer yes yet yey yna ynd yne ynn ynp yns yny yoc yod yoe yon yoo yop yor yos yot yoy ypa ypd ypo yps yra yrc yre yrn yro yrp yrs yrt ysa ysc yse yso ysp ysr yss yst ysy yta ytc ytd yte ytn yto ytp ytr yts ytt yyc yye yys yyt yyy