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marinheiro

@blinry @piko Thank you! I was always curious to know how these worked. It looks very fragile, even with error correction (eg a blob of dirt over the mask pattern bits)

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​Piko

@marinheiro @blinry Yes, that's why there are actually two places for the mask pattern bits. And it still seems to work if both are covered! 🤨 (I tried it just now :D)

I think there's still so much more to the error correction (which would be too much effort to do it completely in your head) that it somehow is really stable...

Two qr codes with the format information marked in blue: First, the vertical line with the format information, then the horizontal line with the same bits.
A qr code where both places for the mask pattern are covered with large blue blobs.
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