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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(cls, data):
 """ Convert "UserComment" value in exif format to str. :param bytes data: "UserComment" value from exif :return: u"foobar" :rtype: str(Unicode) :raises: ValueError if the data does not conform to the EXIF specification, or the encoding is unsupported. """

        if len(data) < cls._PREFIX_SIZE:
            raise ValueError('not enough data to decode UserComment')
        prefix = data[:cls._PREFIX_SIZE]
        body = data[cls._PREFIX_SIZE:]
        if prefix == cls._UNDEFINED_PREFIX:
            raise ValueError('prefix is UNDEFINED, unable to decode UserComment')
        try:
            encoding = {
                cls._ASCII_PREFIX: cls.ASCII, cls._JIS_PREFIX: cls._JIS, cls._UNICODE_PREFIX: cls._UNICODE,
            }[prefix]
        except KeyError:
            raise ValueError('unable to determine appropriate encoding')
        return body.decode(encoding, errors='replace')