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25 votes

Which heptomino is it obvious can't tile the plane?

The one that
RobPratt's user avatar
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4 votes

Yet another pentomino puzzle

I was curious what could possibly be so unusual in the solution. I adapted a program I had for solving pentominos and came up with.
Florian F's user avatar
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44 votes

`print("Hello, World!")`

... ... ... ... ... ... ... ...
loopy walt's user avatar
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