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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 rouge_2(hypotheses, references):
 """ Calculate ROUGE-2 F1, precision, recall scores """

    rouge_2 = [
        rouge_n([hyp], [ref], 2) for hyp, ref in zip(hypotheses, references)
    ]
    rouge_2_f, _, _ = map(np.mean, zip(*rouge_2))
    return rouge_2_f