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You know this already, but I sent them to your email as in your HN profile.

I have no idea how important blackboard is - probably less so for the business world, but plenty of students use/encounter them.

If it's easy to work out a algorithm that cleans up the blackboard but harder to work out detecting the blackboard, your idea of two email addresses (doodle/wb@, and blackboard/bb@) would probably be a good solution.




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