code: def get_all_edge_nodes(self):
          
          edge_nodes = set(e for es in self.edges for e in es)
          for edges in self.edges_rel.values():
              rel_nodes = set(e for es in edges for e in es)
              edge_nodes.update(rel_nodes)
          return edge_nodes
docs: Return a list of all GO IDs that are connected to edges.