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def __init__(self, _format, a_bzrdir, control_files, _commit_builder_class,
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KnitRepository.__init__(self, _format, a_bzrdir, control_files,
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PackRepository.__init__(self, _format, a_bzrdir, control_files,
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_commit_builder_class, _serializer)
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if self._format.supports_chks:
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raise AssertionError("chk not supported")