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please, help me I have exam after tomorrow and I couldn't figure it out. thanks in advance!!!! L = language

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This is not a site for HW. This site is for research-level questions in theoretical computer science. "Research-level" means, roughly, questions that might be discussed between two professors, or between graduate students working on Ph.D.'s, but not usually between a professor and the typical undergraduate student. It does not include questions at the level of difficulty of undergraduate homework. – Mark Reitblatt Feb 14 '11 at 0:04
You may want to post this on Math.SE. – Kaveh♦ Feb 14 '11 at 13:52

closed as off topic by Tsuyoshi Ito, Sadeq Dousti, Robin Kothari, Suresh Venkat♦ Feb 14 '11 at 3:53

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