str sts stt sty sy- syc syd sye syh syk syn syr sys syt tcc tcd tce tch tck tcn tco tcr tcs tct tdc tdd tde tdh tdk tdn tdo tdr tds tdt tdy te- tec ted tee teh tek ten teo ter tes tet tey th- thc thd the thh thk thn tho thr ths tht thy tkc tke tkk tko tkr tks tkt tky tnc tnd tne tnh tnk tnn tno tnr tns tnt to- toc tod toe toh tok ton too tor tos tot toy trc trd tre trh trk trn tro trr trs trt try tsc tsd tse tsh tsk tsn tso tsr tss tst tsy ttc ttd tte tth ttk ttn tto ttr tts ttt tty tyc tyd tye tyn tyo tyr tys tyt ycc ycd yce ych yco ycs ycy yde ydn ydo yds ydt ydy yec yed yee yeh yek yen yeo yer yes yet yey yhc yhe yhs yht ykk ykn ynd yne ynk ynn yns yny yoc yod yoe yok yon yoo yor yos yot yoy yrc yre yrn yro yrs yrt ysc yse ysk yso ysr yss yst ysy ytc ytd yte yth ytk ytn yto ytr yts ytt yyc yye yys yyt yyy