
063 = Meta Magic Squares and Fire Hose Care
A Problem Squared
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The Magic Squares
This is maybe one of the oldest known bits of recreational mathematics. People love these magic squares and they've popped up independently around the world in different cultures all over the shop. The ones that people really like don't have any repeated digits in them. So they're all unique entries in the grid. And we've known about these for thousands of years.
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