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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_file_filters(self, file_filters):
 """ Adds `file_filters` to the internal file filters. `file_filters` can be single object or iterable. """

        file_filters = util.return_list(file_filters)
        self.file_filters.extend(file_filters)