<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_model_nodes(self, model):
 """ Find all the non-auto created nodes of the model. """

        nodes = [(name, node) for name, node in model._nodes.items()
                if node._is_auto_created is False]
        nodes.sort(key=lambda n: n[0])
        return nodes