sle sli sll slo slr sls slt sly sob soc sod soe soi sol soo sor sos sot soy sr- srb src srd sre sri srl sro srr srs srt sry ss- ssb ssc ssd sse ssi ssl sso ssr sss sst stb stc std ste sti stl sto str sts stt sty sy- syb syc syd sye syi syl syr sys syt tbb tbc tbd tbe tbi tbl tbo tbr tbs tbt tcb tcc tcd tce tci tcl tco tcr tcs tct tdb tdc tdd tde tdi tdl tdo tdr tds tdt tdy te- teb tec ted tee tei tel teo ter tes tet tey tib tic tid tie tii til tio tir tis tit tiy tlc tld tle tli tll tlo tlr tls tlt to- tob toc tod toe toi tol too tor tos tot toy trb trc trd tre tri trl tro trr trs trt try tsb tsc tsd tse tsi tsl tso tsr tss tst tsy ttb ttc ttd tte tti ttl tto ttr tts ttt tty tyc tyd tye tyl tyo tyr tys tyt ybc ybe ybi ybl ybr ybs yby ycc ycd yce yci ycl yco ycs ycy yde ydl ydo yds ydt ydy yeb yec yed yee yei yel yeo yer yes yet yey yid yie yii yio yir yis yit ylc yld yle yli yll ylr yls ylt yly yob yoc yod yoe yoi yol yoo yor yos yot yoy yrc yre yro yrs yrt ysb ysc yse ysi ysl yso ysr yss yst ysy ytc ytd yte ytl yto ytr yts ytt yyb yyc yye yys yyt yyy