a-a a-t aaa aad aaf aak aat ad- ada add adf adk adt af- afa afd aff afk aft aka akd akk at- ata atd atf att daa dad daf dak dat dda ddd ddf ddk ddt dfa dfd dff dfk dft dka dkk dkt dta dtd dtf dtk dtt faa fad faf fak fat fda fdd fdf fdk fdt ffa ffd fff ffk fft fka fkf fkk fkt fta ftd ftf ftk ftt k-t ka- kaa kad kaf kak kat kda kdf kdk kdt kfa kfd kff kkk kkt kta ktf ktk ktt taa tad taf tak tat tda tdd tdf tdk tdt tfa tfd tff tfk tft tka tkk tkt tta ttd ttf ttk ttt