fille iflle flile lfile ilfle lifle fille iflle flile lfile ilfle lifle fllie lflie fllie lflie llfie llfie illfe lilfe illfe lilfe llife llife filel iflel fliel lfiel ilfel lifel fiell ifell feill efill iefll eifll fleil lfeil felil eflil lefil elfil ilefl liefl ielfl eilfl leifl elifl filel iflel fliel lfiel ilfel lifel fiell ifell feill efill iefll eifll fleil lfeil felil eflil lefil elfil ilefl liefl ielfl eilfl leifl elifl fllei lflei fllei lflei llfei llfei fleli lfeli felli eflli lefli elfli fleli lfeli felli eflli lefli elfli llefi llefi lelfi ellfi lelfi ellfi illef lilef illef lilef llief llief ilelf lielf iellf eillf leilf elilf ilelf lielf iellf eillf leilf elilf lleif lleif lelif ellif lelif ellif
Note: these 'words' (valid or invalid) are all the permutations of the word fille. These words are obtained by scrambling the letters in fille.