a-a a-t aaa aaf aao aat aay af- afa aff afo aft afy aoa aof aoo aot at- ata atf ato att ay- aya ayf ayo ayt faa faf fao fat fay ffa fff ffo fft ffy foa fof foo fot foy fta ftf fto ftt fty fy- fya fyo oaa oaf oao oat of- ofa off ofo oft oo- ooa oof ooo oot ot- ota otf oto ott oya oyo taa taf tao tat tay tfa tff tfo tft to- toa tof too tot toy tta ttf tto ttt tty tya tyf tyo tyt yaa yaf yao yat yay yfa yff yft yof yoo yot yoy yta ytf yto ytt yyf yyt yyy