In order to program the AI, they fed it around 200 stories written by real people on two different scenarios: going to the movies and robbing a bank. It doesn't actually understand whatever it reads, but it can recognize patterns and keyphrases, which serve as its cues to know what choices to write up next. For instance, it knows that giving the reader the choice to sit down and watch the movie should go after he's already chosen "buy tickets" from the list. It's still not capable of spinning overly complicated plots at the moment, but it looks like it has a future in generating fun, non-repetitive text-based games.

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