II, sect.  Ibid., 2001, Supplement No. 3 (E/2001/23), chap.

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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Ibid., 2001, Supplément No 3 (E/2001/23), chap. II, sect. A.