Except for anything by Lewis Carroll or Tolkien, you get five made-up words per story.  I'm looking at you, Anathem.

"Fiction Rule of Thumb", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Except for anything by Lewis Carroll or Tolkien, you get five made-up words per story. I'm looking at you, Anathem.