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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 evaluate(self):
 """Run the engine on the expression This method performs alignment which is necessary no matter what engine is being used, thus its implementation is in the base class. Returns ------- obj : object The result of the passed expression. """

        if not self._is_aligned:
            self.result_type, self.aligned_axes = _align(self.expr.terms)

        # make sure no names in resolvers and locals/globals clash
        res = self._evaluate()
        return _reconstruct_object(self.result_type, res, self.aligned_axes,
                                   self.expr.terms.return_type)