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Returns a square of order \(n=2m\) that has been claimed to be magic, but isn't.
notmagic.2n(m)
Order of square is \(n=2m\)
Robin K. S. Hankin
“Magic Squares and Cubes”, Andrews, (book)
notmagic.2n(4) is.magic(notmagic.2n(4)) is.semimagic(notmagic.2n(4))
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