a-a aaa aaf aao aar aay af- afa aff afo afr afy aoa aof aoo aor ar- ara arf aro arr ary ay- aya ayf ayo ayr faa faf fao far fay ffa fff ffo ffr ffy foa fof foo for foy fra frf fro frr fry fy- fya fyo oaa oaf oao oar of- ofa off ofo ofr oo- ooa oof ooo oor or- ora orf oro orr ory oya oyo ra- raa raf rao rar ray rfa rff rfo rfr roa rof roo ror roy rra rrf rrr ry- rya ryf ryo ryr ryy yaa yaf yao yar yay yfa yff yfr yof yoo yor yoy yra yrf yro yyf yyy