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import os
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import warnings
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from bzrlib import (
 
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    revision,
 
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    )
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from bzrlib.branch import Branch
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from bzrlib.errors import NoSuchRevision
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from bzrlib.graph import Graph
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                             common_ancestor,
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                             is_ancestor, MultipleRevisionSources,
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                             NULL_REVISION)
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from bzrlib.tests import TestCaseWithTransport
 
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from bzrlib.tests import TestCase, TestCaseWithTransport
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from bzrlib.trace import mutter
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from bzrlib.workingtree import WorkingTree
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