a-a a-t aaa aaf aao aas aat aay af- afa aff afo afs aft afy aoa aof aoo aos aot as- asa asf aso ass ast asy at- ata atf ato ats att ay- aya ayf ayo ays ayt faa faf fao fas fat fay ffa fff ffo ffs fft ffy foa fof foo fos fot foy fsa fsf fso fss fst fta ftf fto fts ftt fty fy- fya fyo oaa oaf oao oas oat of- ofa off ofo ofs oft oo- ooa oof ooo oos oot os- osa osf oso oss ost ot- ota otf oto ots ott oya oyo oys saa saf sao sas sat say sfa sff sfo sfs sft soa sof soo sos sot soy ss- ssa ssf sso sss sst sta stf sto sts stt sty sy- sya sys syt taa taf tao tas tat tay tfa tff tfo tfs tft to- toa tof too tos tot toy tsa tsf tso tss tst tsy tta ttf tto tts ttt tty tya tyf tyo tys tyt yaa yaf yao yas yat yay yfa yff yfs yft yof yoo yos yot yoy ysa yso yss yst ysy yta ytf yto yts ytt yyf yys yyt yyy