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Along the left hand side are other tools for seeing how the classifier within NPCEditor parses user input, analyzes it, and selects the best response.
There is no set way in how to author a character, but the general approach is:
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Initially you can just have a couple of questions for each set of answers, but user testing will result in many different paraphrases for these questions. Collecting all these paraphrases and linking them to the right set of answers ensures that your character will get more and more robust.
See the NPCEditor section in the Main FAQ.