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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 addcomment(self, creditmemo_increment_id, comment, email=True, include_in_email=False):
 """ Add new comment to credit memo :param creditmemo_increment_id: Credit memo increment ID :return: bool """

        return bool(
            self.call(
                'sales_order_creditmemo.addComment',
                [creditmemo_increment_id, comment, email, include_in_email]
            )
        )