Translate to Finnish:

The UN Secretary-General asked the Contact Group to report back to him by 10 December.

Finnish:

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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YK:n pääsihteeri pyysi yhteysryhmää antamaan hänelle selonteon 10. joulukuuta mennessä.