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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 load(fileobj):
 """Load the submission from a file-like object :param fileobj: File-like object :return: the loaded submission """

        with gzip.GzipFile(fileobj=fileobj, mode='r') as z:
            submission = Submission(metadata=json.loads(z.readline()))

            for line in z:
                token_id, token = json.loads(line)
                submission['tokens'][token_id] = token

        return submission