spp spr sps spt spy sr- src sre srf sri srn sro srp srr srs srt sry ss- ssc sse ssf ssi ssn sso ssp ssr sss sst stc ste stf sti stn sto stp str sts stt sty sy- syc sye syi syn syp syr sys syt tcc tce tcf tci tcn tco tcp tcr tcs tct te- tec tee tef tei ten teo tep ter tes tet tey tfc tfe tff tfi tfn tfo tfp tfr tfs tft tic tie tif tii tin tio tip tir tis tit tiy tnc tne tnf tni tnn tno tnp tnr tns tnt to- toc toe tof toi ton too top tor tos tot toy tpc tpe tpf tpi tpn tpo tpp tpr tps tpt trc tre trf tri trn tro trp trr trs trt try tsc tse tsf tsi tsn tso tsp tsr tss tst tsy ttc tte ttf tti ttn tto ttp ttr tts ttt tty tyc tye tyf tyn tyo typ tyr tys tyt ycc yce ycf yci yco ycp ycs ycy yec yee yef yei yen yeo yep yer yes yet yey yfc yfe yff yfr yfs yft yie yif yii yin yio yip yir yis yit yne ynn ynp yns yny yoc yoe yof yoi yon yoo yop yor yos yot yoy ypf ypo yps yrc yre yrf yrn yro yrp yrs yrt ysc yse ysi yso ysp ysr yss yst ysy ytc yte ytf ytn yto ytp ytr yts ytt yyc yye yyf yys yyt yyy