code: def _get_sub_flows(self):
      return [DummyWorkflow1, DummyWorkflow2]
  
imports: from dipy.workflows.workflow import Workflow
  from dipy.workflows.combined_workflow import CombinedWorkflow
label_desc: Use image node_id 1 for calling the DummyCombinedWorkflow obj's underlying member method code with example usage: obj._get_sub_flows() and returns: list