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You can do whatever you want in your novel. I am writing a book with 4 protagonists, which goes against the rules as well. But if you have enough skill, you can do it. Look at Orson Scott Card's En...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/21723 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/