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1. Sniffnoy · 1789757963 · focus · HN ↗

   Wondering: if the process for the upper part of the sandwich is the complement of the process for the lower part, why was it so much more difficult? What would go wrong if you took one of the earlier lower-sandwich processes, and complemented it in a similar way? I have to assume it's something, but what?

   1. zem · 1789774287 · focus · HN ↗

      my guess is that they also had to prove that the complement process was mathematically sound

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