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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 read_levels(text):
 """ Read text and get there reffs :param text: Collection (Readable) :return: """

    x = []
    for i in range(0, len(NAUTILUSRESOLVER.getMetadata(text).citation)):
        x.append(NAUTILUSRESOLVER.getReffs(text, level=i))
    return x