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Working on a puzzle book series (for lovers, maybe) https://www.kakurokokoro.com

It’s a pretty bad hack of HTML, CSS, and some JavaScript, saved by Laravel, trying to print slightly larger than A5 paper for a major on demand publisher standard paperback, with browser Print to PDF settings, and is unwieldy but to the point, has an ISBN as well as being NP-complete. Discovered for myself that the number of permutations and derangements of the same length are related by the ratio of Euler’s Number e.



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