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from bzrlib.graph import node_distances, select_farthest, all_descendants, Graph
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from bzrlib.osutils import contains_whitespace
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from bzrlib.progress import DummyProgress
 
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from bzrlib.symbol_versioning import *
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NULL_REVISION="null:"
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            source.unlock()
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@deprecated_method(zero_eight)
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def get_intervening_revisions(ancestor_id, rev_id, rev_source, 
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                              revision_history=None):
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    """Find the longest line of descent from maybe_ancestor to revision.