Thanks for participating POW; We will resume on Feb, 2010.

Problem 2009-23 was the last problem of this semester. Best wishes and good luck to your final exam. We wish you to come back in the spring semester next year; we will start in the first week of February.

Two problems 2009-14 and 2009-15,  were contributed by Sungyoon Kim (김성윤), a graduate student in MIT. Thanks.

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