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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 doit(self, classes=None, recursive=True, **kwargs):
 """Write out commutator Write out the commutator according to its definition $[\Op{A}, \Op{B}] = \Op{A}\Op{B} - \Op{A}\Op{B}$. See :meth:`.Expression.doit`. """

        return super().doit(classes, recursive, **kwargs)