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def _open_control_files(self, a_bzrdir):
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transport = a_bzrdir.get_workingtree_transport(None)
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def initialize(self, a_bzrdir, revision_id=None, from_branch=None,
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accelerator_tree=None, hardlink=False):
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"""See WorkingTreeFormat.initialize().
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:param revision_id: if supplied, create a working tree at a different
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revision than the branch is at.
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:param accelerator_tree: A tree which can be used for retrieving file