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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 designator(self):
 """\ Returns the version and error correction level as string `V-E` where `V` represents the version number and `E` the error level. """

        version = str(self.version)
        return '-'.join((version, self.error) if self.error else (version,))