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        Both patterns and scopes are cast to lowercase.
        For more examples, refer to tests/unit/parsing/test_scope_selector.py
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    >>> parse_rhs('IDEA-CBC SEED-CBC', 'cipher')
    [(Operation.RESET, None),
     (Operation.APPEND, 'IDEA-CBC'),
     (Operation.APPEND, 'SEED-CBC')]
    >>> # 3DES-CBC gets prepended last for higher prio
    >>> parse_rhs('+*DES-CBC', 'cipher')
    [(Operation.PREPEND, 'DES-CBC'),
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               operation=Operation.RESET, value=None),
     Directive(prop_name='cipher', scope='tls',
               operation=Operation.APPEND, value='RC4-40'),
     Directive(prop_name='cipher', scope='tls',
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    >>> with warnings.catch_warnings():
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