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Jun 2, 2011 at 3:03 vote accept Li Zhan
Jun 2, 2011 at 3:03 vote accept Li Zhan
Jun 2, 2011 at 3:03
Jun 2, 2011 at 3:02 comment added Li Zhan Nice argument! It is essentially like the second approach in the second answer, but successfully avoid complicated argument.
Jun 2, 2011 at 2:59 vote accept Li Zhan
Jun 2, 2011 at 3:02
Jun 1, 2011 at 5:21 history answered Sándor Kovács CC BY-SA 3.0