a-a aaa aaf aam aao aay af- afa aff afm afo afy ama amf amm amo amy aoa aof aom aoo ay- aya ayf ayo faa faf fam fao fay ffa fff ffm ffo ffy fma fmf fmm fmo foa fof fom foo foy fy- fya fyo m-f m-o maa maf mam mao may mfa mff mfm mfo mfy mma mmf mmm mmo moa mof mom moo moy my- mya myf mym myo oaa oaf oam oao of- ofa off ofm ofo om- oma omf omm omo omy oo- ooa oof oom ooo oya oyo yaa yaf yam yao yay yfa yff yfm yma ymm ymo yof yom yoo yoy yyf yyy