a-a aaa aaf aao aap aay af- afa aff afo afp afy aoa aof aoo aop ap- apa apf apo app apy ay- aya ayf ayo ayp faa faf fao fap fay ffa fff ffo ffp ffy foa fof foo fop foy fpa fpo fpp fpy fy- fya fyo fyp oaa oaf oao oap of- ofa off ofo ofp oo- ooa oof ooo oop op- opa opf opo opp opy oya oyo p-p paa paf pao pap pay pfa pff pfo pfp pfy poa pof poo pop poy ppa ppf ppo ppp py- pya pyf pyo yaa yaf yao yap yay yfa yff yof yoo yop yoy ypa ypf ypo yyf yyy