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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:
 async def delete(self):
 """Delete this interface link."""

        interface = self._data['interface']
        data = await interface._handler.unlink_subnet(
            system_id=interface.node.system_id, id=interface.id, _id=self.id)
        interface._data['links'] = list(data['links'])
        interface._orig_data['links'] = copy.deepcopy(interface._data['links'])