sr- src sre srf sri srl srn sro srr srs srt sry ss- ssc sse ssf ssi ssl ssn sso ssr sss sst stc ste stf sti stl stn sto str sts stt sty sy- syc sye syi syl syn syr sys syt tcc tce tcf tci tcl tcn tco tcr tcs tct te- tec tee tef tei tel ten teo ter tes tet tey tfc tfe tff tfi tfl tfn tfo tfr tfs tft tic tie tif tii til tin tio tir tis tit tiy tlc tle tlf tli tll tln tlo tlr tls tlt tnc tne tnf tni tnl tnn tno tnr tns tnt to- toc toe tof toi tol ton too tor tos tot toy trc tre trf tri trl trn tro trr trs trt try tsc tse tsf tsi tsl tsn tso tsr tss tst tsy ttc tte ttf tti ttl ttn tto ttr tts ttt tty tyc tye tyf tyl tyn tyo tyr tys tyt ycc yce ycf yci ycl yco ycs ycy yec yee yef yei yel yen yeo yer yes yet yey yfc yfe yff yfr yfs yft yie yif yii yin yio yir yis yit ylc yle yli yll ylr yls ylt yly yne ynn yns yny yoc yoe yof yoi yol yon yoo yor yos yot yoy yrc yre yrf yrn yro yrs yrt ysc yse ysi ysl yso ysr yss yst ysy ytc yte ytf ytl ytn yto ytr yts ytt yyc yye yyf yys yyt yyy