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353
for revision_parents in parent_map.itervalues():
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parents.update(revision_parents)
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355
parents.difference_update(revision_root.keys() + [NULL_REVISION])
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357
parents = graph.get_parent_map(parents).keys()
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358
for tree in self.iter_rev_trees(parents):
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359
root_id = tree.get_root_id()