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update link to Erich Friedman's pages

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edit approved Dec 7, 2020 at 0:12

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http://www2.stetson.edu/~efriedma/mathmagic/0610.html hashttps://erich-friedman.github.io/mathmagic/0610.html has some answers for small numbers of squares.

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created May 17, 2014 at 15:08

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http://www2.stetson.edu/~efriedma/mathmagic/0610.html has some answers for small numbers of squares.