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    >>> parse_locale('it_IT@euro')
    ('it', 'IT', None, None)
    >>> parse_locale('en_US.UTF-8')
    ('en', 'US', None, None)
    >>> parse_locale('de_DE.iso885915@euro')
    ('de', 'DE', None, None)
    
    :param identifier: the locale identifier string
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                identifier
    :return: the ``(language, territory, script, variant)`` tuple
    :rtype: `tuple`
    :raise `ValueError`: if the string does not appear to be a valid locale
                         identifier
    
    :see: `IETF RFC 4646 <http://www.ietf.org/rfc/rfc4646.txt>`_
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