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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 get_search_fields(self, exclude=None):
 """ Get the fields for searching for an item. """

        exclude = set(exclude)
        if self.search_fields and len(self.search_fields) > 1:
            exclude = exclude.union(self.search_fields)

        return self.get_filter_fields(exclude=exclude)