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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 validate_integrity(self):
 """ Validate the integrity of the DataFrame. This checks that the indexes, column names and internal data are not corrupted. Will raise an error if there is a problem. :return: nothing """

        self._validate_columns(self._columns)
        self._validate_index(self._index)
        self._validate_data()