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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def execute_plan(plan):
 """"Execute the plan. Args: plan (:obj:`list` of :obj:`actions.Step`):
 The plan we want to execute. Returns: (:obj:`list` of :obj:`actions.Step`):
 A list of failed actions. """

    results = [action() for action in plan]
    return [result for result in results if actns.step_has_failed(result)]