code: def get_if_deleted(self, addresses):
          
  
          with self._lock:
              results = []
              for add in addresses:
                  results.append(self._get_if_deleted(add))
              return results
docs: Returns a list of addresses that have been deleted, or None if it
          hasn't been deleted.
  
          Args:
              addresses (list of str): The addresses to check if deleted.
  
          Returns:
              (list of str): The addresses, if deleted, or None.