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A comment on Show HN: Speedsums.
https://en.wikipedia.org/wiki/Krypto_(game)
Play it here: http://illuminations.nctm.org/Activity.aspx?id=3569
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https://en.wikipedia.org/wiki/Krypto_(game)
Play it here: http://illuminations.nctm.org/Activity.aspx?id=3569