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Here are some more ideas from a thread a few months ago: https://news.ycombinator.com/item?id=23757396 https://news.ycombinator.com/item?id=23757396

• DavidSJ 6y ago
  And another (posted by yours truly): https://news.ycombinator.com/item?id=23758188 https://news.ycombinator.com/item?id=23758188