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raise NotImplementedError(self.annotate_iter)
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def _get_plan_merge_data(self, file_id, other, base):
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vf = versionedfile._PlanMergeVersionedFile(file_id)
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last_revision_a = self._get_file_revision(file_id, vf, 'this:')
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last_revision_b = other._get_file_revision(file_id, vf, 'other:')