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  • $\begingroup$ As for why 2) is no longer valid, I suspect it's because MacWilliams died in 1990. en.wikipedia.org/wiki/Jessie_MacWilliams $\endgroup$ Commented Dec 17, 2014 at 20:42
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    $\begingroup$ Dear Voloch, I think you are right. But it is a little strange for me, why mathematicians should forget the heritage of the great mathematician like MacWiliams? It is just $10$ dollar, and I think someone must accept it and pay it in the future. If I can pay, I will accept it, maybe a good news. $\endgroup$ Commented Dec 18, 2014 at 10:48