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to_transform.version_file(file_id, s_trans_id)
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def _inverse_lines(self, new_lines, file_id):
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"""Produce a version with only those changes removed from new_lines."""
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target_lines = self.target_tree.get_file_lines(file_id)
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return merge3.Merge3(new_lines, target_lines, work_lines).merge_lines()