spp spr sps spt spy sr- src srd sre srg sri sro srp srr srs srt sry ss- ssc ssd sse ssg ssi sso ssp ssr sss sst stc std ste stg sti sto stp str sts stt sty sy- syc syd sye syg syi syp syr sys syt tcc tcd tce tcg tci tco tcp tcr tcs tct tdc tdd tde tdg tdi tdo tdp tdr tds tdt tdy te- tec ted tee teg tei teo tep ter tes tet tey tgc tge tgg tgi tgo tgp tgr tgs tgt tgy tic tid tie tig tii tio tip tir tis tit tiy to- toc tod toe tog toi too top tor tos tot toy tpc tpd tpe tpg tpi tpo tpp tpr tps tpt trc trd tre trg tri tro trp trr trs trt try tsc tsd tse tsg tsi tso tsp tsr tss tst tsy ttc ttd tte ttg tti tto ttp ttr tts ttt tty tyc tyd tye tyg tyo typ tyr tys tyt ycc ycd yce yci yco ycp ycs ycy yde ydg ydo yds ydt ydy yec yed yee yeg yei yeo yep yer yes yet yey ygc ygo yid yie yig yii yio yip yir yis yit yoc yod yoe yog yoi yoo yop yor yos yot yoy ypd ypg ypo yps yrc yre yrg yro yrp yrs yrt ysc yse ysg ysi yso ysp ysr yss yst ysy ytc ytd yte yto ytp ytr yts ytt yyc yye yyg yys yyt yyy