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"""See WorkingTreeFormat.get_format_string()."""
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return "Sample tree format."
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def initialize(self, a_bzrdir, revision_id=None, from_branch=None):
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def initialize(self, a_bzrdir, revision_id=None, from_branch=None,
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"""Sample branches cannot be created."""
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t = a_bzrdir.get_workingtree_transport(self)
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t.put_bytes('format', self.get_format_string())