tti tto ttp ttr tts ttt ttx tty txe txi txs txt tya tyc tye tyo typ tyr tys tyt xaa xac xap xar xas xat xci xcp xcr xcx xee xep xer xes xet xex xia xic xie xii xio xis xit xix xoa xoc xoi xoo xop xor xos xot xox xpa xpc xpe xpo xpp xps xpt xrc xrt xrx xry xsa xsc xsi xsp xss xst xtc xti xtp xtr xts xtx xty xxi xxo xxp xxx xxy xyp xyr xyy yaa yac yae yai yao yap yar yas yat yax yay yca ycc yce yci yco ycp ycs ycy yea yec yee yei yeo yep yer yes yet yex yey yie yii yio yip yir yis yit yoc yoe yoi yoo yop yor yos yot yox yoy ypa ypo yps yra yrc yre yro yrp yrs yrt ysa ysc yse ysi yso ysp ysr yss yst ysy yta ytc yte yto ytp ytr yts ytt yxa yxe yxy yyc yye yys yyt yyy