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Aug 28, 2014 at 9:23 vote accept R B
Aug 28, 2014 at 9:23
Jul 16, 2014 at 22:58 history edited D.W. CC BY-SA 3.0
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Jul 16, 2014 at 17:11 comment added D.W. @RB, OK, no problem! Your construction is nicer. You might want to edit your question to mention that in your application $k \ll |\Sigma|$.
Jul 16, 2014 at 16:49 comment added R B Thanks @D.W. for the answer. It is a nice construction, but in my application $k<<|\Sigma|$.
Jul 16, 2014 at 16:44 history answered D.W. CC BY-SA 3.0