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    def initialize(self, a_bzrdir):
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        """Format 4 branches cannot be created."""
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        t = a_bzrdir.get_branch_transport(self)
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        t.put('format', StringIO(self.get_format_string()))
 
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        t.put_bytes('format', self.get_format_string())
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        return 'A branch'
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    def is_supported(self):