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self.revisions = KnitVersionedFiles(
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_KnitGraphIndex(self._pack_collection.revision_index.combined_index,
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add_callback=self._pack_collection.revision_index.add_callback,
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deltas=False, parents=True, is_locked=self.is_locked),
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deltas=False, parents=True, is_locked=self.is_locked,
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data_access=self._pack_collection.revision_index.data_access,
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self.signatures = KnitVersionedFiles(