a-a aaa aad aaf aao aay ad- ada add adf ado ady af- afa afd aff afo afy aoa aod aof aoo ay- aya ayd ayf ayo daa dad daf dao day dda ddd ddf ddo ddy dfa dfd dff dfo doa dod dof doo doy dy- dya dyd dyo dyy faa fad faf fao fay fda fdd fdf fdo ffa ffd fff ffo ffy foa fof foo foy fy- fya fyo oaa oad oaf oao oda odd odf odo of- ofa ofd off ofo oo- ooa ood oof ooo oya oyd oyo yaa yad yaf yao yay yda ydo ydy yfa yfd yff yod yof yoo yoy yyf yyy