eeee eees eefe eese eesi eesy efes effi effs effy efsi eiei eies eifs eise eiss eisy esee eses esfs esie esis esse essi essy exes exif exis exxy eyes eyey eyfi eyse fees fefe feff fefi feie feis fese fess feys ffee ffff ffii ffss fief fies fife fiff fifi fiii fise fisi fiss fixe fixx fixy fsfi fsix fssf fyfe fyfi ieie iesi ifes ifex iffy ifis iies iiie iiii iiis iisi isee ises isie isis isse issf issi isss issy isys ixxi iyse s-ii se-e se-f se-i se-s se-x se-y seef sees seex seey seff sefi seie seif seii seis seix sese sesi sess sex- sexe sexi sexy seye seyf seys sfss sief sies siex sife siff sify sise sisi siss sisy sixe sixx siyi ssee sses ssex ssis sssf sssi ssss syes syfe syff syfy syis syse syss syxe x-fi xefe xexe xify xiii xisi xixi xxii xxix xxxi xxxx xxxy yees yefe yeff yeie yeii yesi yess yeye yeyi yiff yise yiss ysee yses ysii ysse yyfe yyff yyyy