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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 create_entity(self):
 """Create a new entity. The entity will have a higher UID than any previously associated with this world. :return: the new entity :rtype: :class:`essence.Entity`"""

        self._highest_id_seen += 1
        entity = Entity(self._highest_id_seen, self)
        self._entities.append(entity)
        return entity