code: def extract_causal_relations(self):
          
          # Get the extractions that are labeled as directed and causal
          relations = [e for e in self.doc.extractions if
                       'DirectedRelation' in e['labels'] and
                       'Causal' in e['labels']]
          # For each relation, we try to extract an INDRA Statement and
          # save it if its valid
          for relation in relations:
              stmt = self.get_causal_relation(relation)
              if stmt is not None:
                  self.statements.append(stmt)
docs: Extract causal relations as Statements.