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bzrlib/revisiontree.py
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        A RevisionTree's parents match the revision graph.
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        """
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        parent_ids = self._repository.get_revision(self._revision_id).parent_ids
 
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        if self._revision_id not in (None, 'null:'):
 
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            parent_ids = self._repository.get_revision(
 
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                self._revision_id).parent_ids
 
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        else:
 
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            parent_ids = []
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        return parent_ids
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    def get_revision_id(self):