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@gerbrand @quincy @Virginicus @mildsunrise

Basically, the things that get "left as exercise to the reader" are so often awful because it's exactly the kind of picky, exhausting problem that isn't satisfying to do more than once.

Were it an elegant and breezy problem where everything comes together in a satisfying way the author would write it out just for the joy of doing it again.

Anyway that's my theory.

That said the "bad problems" are often where you really find out what you know.