code: def show_relations(self):
          ''' display every relation in the database as (src, relation, dst) '''
          for src_node in self.iter_nodes():
              for relation in src_node.outgoing:
                  for dst_node in src_node.outgoing[relation]:
                      print(repr(src_node.obj), '-', relation, '-', repr(dst_node.obj)f show_relations(self):
          ''' display every relation in the database as (src, relation, dst) '''
          for src_node in self.iter_nodes():
              for relation in src_node.outgoing:
                  for dst_node in src_node.outgoing[relation]:
                      print(repr(src_node.obj), '-', relation, '-', repr(dst_node.obj))
docs: display every relation in the database as (src, relation, dst)