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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(self):
 """Validate that the UnaryTransformation is correctly representable."""

        _validate_operator_name(self.operator, UnaryTransformation.SUPPORTED_OPERATORS)

        if not isinstance(self.inner_expression, Expression):
            raise TypeError(u'Expected Expression inner_expression, got {} {}'.format(
                type(self.inner_expression).__name__, self.inner_expression))