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bzrlib/repofmt/knitrepo.py
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        """See graph._StackedParentsProvider.get_parent_map"""
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        parent_map = {}
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        for revision_id in keys:
 
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            if revision_id is None:
 
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                raise ValueError('get_parent_map(None) is not valid')
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            if revision_id == _mod_revision.NULL_REVISION:
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                parent_map[revision_id] = ()
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            else:
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        reconciler.reconcile()
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        return reconciler
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    @symbol_versioning.deprecated_method(symbol_versioning.one_five)
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    def revision_parents(self, revision_id):
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        return self._get_revision_vf().get_parents(revision_id)
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    def _make_parents_provider(self):
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        return _KnitsParentsProvider(self.revisions)
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