a-a aaa aaf aao aas aay af- afa aff afo afs afy aoa aof aoo aos as- asa asf aso ass asy ay- aya ayf ayo ays faa faf fao fas fay ffa fff ffo ffs ffy foa fof foo fos foy fsa fsf fso fss fy- fya fyo oaa oaf oao oas of- ofa off ofo ofs oo- ooa oof ooo oos os- osa osf oso oss oya oyo oys saa saf sao sas say sfa sff sfo sfs soa sof soo sos soy ss- ssa ssf sso sss sy- sya sys yaa yaf yao yas yay yfa yff yfs yof yoo yos yoy ysa yso yss ysy yyf yys yyy