tta ttc tte tti ttl ttn tto tts ttt ttx tty txe txi txl txn txs txt tya tyc tye tyl tyn tyo tys tyt xaa xac xal xan xas xat xci xcl xcx xee xel xen xes xet xex xia xic xie xii xin xio xis xit xix xla xli xls xlt xna xnc xno xns xoa xoc xoi xon xoo xos xot xox xsa xsc xsi xsl xss xst xtc xti xts xtx xty xxi xxl xxo xxx xxy xyl xyy yaa yac yae yai yal yan yao yas yat yax yay yca ycc yce yci ycl yco ycs ycy yea yec yee yei yel yen yeo yes yet yex yey yie yii yin yio yis yit ylc yle yli yll yls ylt yly yna yne ynn yns yny yoc yoe yoi yol yon yoo yos yot yox yoy ysa ysc yse ysi ysl yso yss yst ysy yta ytc yte ytl ytn yto yts ytt yxa yxe yxy yyc yye yys yyt yyy