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Aug 5, 2011 at 17:33 comment added Benjamin Steinberg @Martin, I agree and certainly claim no originality here. But I think that this was the answer the OP was looking for. Since the other responses used more complicated and less general methods, I thought it worth adding.
Aug 5, 2011 at 9:51 comment added Martin Brandenburg ... and a solution to a well-known exercise ;).
Jul 26, 2011 at 0:55 vote accept mr.bigproblem
Jul 26, 2011 at 0:10 history answered Benjamin Steinberg CC BY-SA 3.0