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def open(self, a_bzrdir, name=None, _found=False, ignore_fallbacks=False):
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"""See BranchFormat.open()."""
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# we are being called directly and must probe.
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raise NotImplementedError
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return BzrBranch(_format=self,
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_control_files=a_bzrdir._control_files,
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_repository=a_bzrdir.open_repository())