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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 get_original(self):
 """Get the original instance of this instance before it's updated. Returns: fleaker.peewee.EventMixin: The original instance of the model. """

        pk_value = self._get_pk_value()

        if isinstance(pk_value, int) and not self._original:
            self._original = (
                self.select().where(self.__class__.id == pk_value).get()
            )

        return self._original