code: def resolve_nodes(self, nodes):
          
          if not nodes:
              return []
          resolved = []
          for node in nodes:
              if node in resolved:
                  continue
              self.resolve_node(node, resolved)
          return resolved
docs: Resolve a given set of nodes.
  
          Dependencies of the nodes, even if they are not in the given list will
          also be resolved!
  
          :param list nodes: List of nodes to be resolved
          :return: A list of resolved nodes