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not present in file history."""
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raise NotImplementedError(self.add_lines)
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def clone_text(self, new_version_id, old_version_id, parents,
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def clone_text(self, new_version_id, old_version_id, parents):
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"""Add an identical text to old_version_id as new_version_id.
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Must raise RevisionNotPresent if the old version or any of the