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It does seem too obvious, and the comment seems to be pointing somewhere else like you say.

What do you mean about the compressed size?

There are no hidden chunks in the file, and the image data chunk when inflated is 60147 bytes, vs 1270 compressed.

I ran `convert -compress None puzzle.png` and the output was ~800 bytes. Clearly that's optimizing the image too, but basically the image seems wastefully large, and that makes me suspicious there's something going on there.

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