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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_cleaned_kwargs(self, kwargs):
 """ Returns concrete field lookups. """

        cleaned_kwargs = kwargs.copy()

        if kwargs is not None:
            for k in kwargs:
                if self.is_linguist_lookup(k):
                    del cleaned_kwargs[k]

        return cleaned_kwargs