a-a a-t aaa aad aaf aat aay ad- ada add adf adt ady af- afa afd aff aft afy at- ata atd atf att ay- aya ayd ayf ayt daa dad daf dat day dda ddd ddf ddt ddy dfa dfd dff dft dta dtd dtf dtt dty dy- dya dyd dyy faa fad faf fat fay fda fdd fdf fdt ffa ffd fff fft ffy fta ftd ftf ftt fty fy- fya taa tad taf tat tay tda tdd tdf tdt tdy tfa tfd tff tft tta ttd ttf ttt tty tya tyd tyf tyt yaa yad yaf yat yay yda ydt ydy yfa yfd yff yft yta ytd ytf ytt yyf yyt yyy